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Live updates: Blinken says vaccine disparity must be tackled

People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) A commuter walks past a TFL (Transport for London) information poster telling passengers that it is compulsory to wear a face mask on public transport to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) People wait in the observation area after receiving the Pfizer COVID-19 vaccine at the Vaccination Centre of Hope at the Cape Town International Convention Centre in Cape Town, South Africa, Tuesday, Nov. 30, 2021. (AP Photo/Nardus Engelbrecht) A pedestrian wears a mak as they pass a mural in London, Tuesday, Nov. 30, 2021. With the emergence of the omicron variant the British government are requiring people to wear masks in shops and on public transport starting Tuesday. The omicron variant was already in the Netherlands when South Africa alerted the World Health Organization about it last week, Dutch health authorities said Tuesday, adding to fear and confusion over the new version of the coronavirus in a weary world hoping it had left the worst of the pandemic behind. (AP Photo/Kirsty Wigglesworth) British Prime Minister Boris Johnson gives the thumbs up as he speaks to members of the staff during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) British Prime Minister Boris Johnson, left, watches as a patient receives a COVID-19 vaccine during his visit to the Lordship Lane Primary care center where he met staff and people receiving their booster vaccines, in London, Tuesday, Nov. 30, 2021. (Paul Grover/Pool Photo via AP) Bus passengers wait at a bus stop next to a Stay Safe sign which encourages social distancing and the wearing of masks to curb the spread of COVID-19, in London, Tuesday, Nov. 30, 2021. The emergence of the new COVID-19 omicron variant and the world's desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines.(AP Photo/Alastair Grant) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) A person wearing a mask, walks on the street in the city center in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) Travellers wait in queue to test for COVID-19 at a train station in Mumbai, India, Tuesday, Nov. 30, 2021. (AP Photo/Rafiq Maqbool) People wear face masks as they sing a song in honor of Saint Saturnine, on his festivity day, in Pamplona, northern Spain, Monday, Nov. 29, 2021. (AP Photo/Alvaro Barrientos) Due to the lockdown, shops and restaurants are all closed and a person does ,Window Shopping' in Vienna, Austria, Tuesday, Nov. 30, 2021. (AP Photo/Lisa Leutner) U.S. Secretary of State Antony Blinken, left, and Latvian President Egils Levits pose for the media in Riga, Latvia Tuesday, Nov. 30, 2021. (Ints Kalnins/Pool Photo via AP) FILE - A medical worker prepares a shot of Russia's Sputnik Lite coronavirus vaccine at a vaccination center in the GUM, State Department store, in Red Square with the St. Basil Cathedral in the background, in Moscow, Russia, Oct. 26, 2021. The developer of Russia's Sputnik V vaccine said Monday Nov. 29, 2021, that it will immediately start working on adapting that COVID-19 vaccine to counter the omicron variant. (AP Photo/Pavel Golovkin, File)