The Latest: WH: US to buy 200M more doses of Pfizer vaccine


              Dancers perform during the opening ceremony in the Olympic Stadium at the 2020 Summer Olympics, Friday, July 23, 2021, in Tokyo, Japan. (AP Photo/Charlie Riedel)
            
              Visitors enter after registering for COVID-19 tests at the Georges Pompidou museum in Paris, Friday, July 23, 2021. Visitors now need a special COVID pass to visit French museums or movie theaters, the first step in a new campaign against what the government calls a "stratospheric" rise in delta variant infections. (AP Photo/Rafael Yaghobzadeh)
            White House press secretary Jen Psaki speaks at a press briefing at the White House in Washington, Friday, July 23, 2021. (AP Photo/Andrew Harnik) 
              Naomi Osaka lights the Olympic flame during the opening ceremony in the Olympic Stadium at the 2020 Summer Olympics, Friday, July 23, 2021, in Tokyo, Japan. (AP Photo/David J. Phillip)
            
              FILE - In this July 6, 2021, file photo, a patient receives a Johnson & Johnson vaccine against COVID-19 in Hammanskraal, South Africa. South Africa's COVID-19 vaccination campaign is regaining momentum after being disrupted earlier this month by a week of riots following the imprisonment of former President Jacob Zuma. (AP Photo/Alet Pretorius, File)
            FILE - In this July 5 2021, file photo a policeman receives his Johnson & Johnson COVID-19 vaccine in Soweto, South Africa. South Africa's COVID-19 vaccination campaign is regaining momentum after being disrupted earlier this month by a week of riots following the imprisonment of former President Jacob Zuma. (AP Photo/Alet Pretorius, File) 
              FILE - In this July 22, 2021 file photo, Soile Reyes, 12, of Brooklyn, receives the first dose of the Pfizer COVID-19 vaccine as her mother Evelyn Pereira looks on at the American Museum of Natural History in New York.  Most Americans who haven’t been vaccinated against COVID-19 say they are unlikely to get the shots and doubt they would work against the aggressive delta variant despite evidence they do, according to a new poll that underscores the challenges facing public health officials amid soaring infections in some states. (AP Photo/Mary Altaffer)
            
              FILE - In this July 22, 2021 file photo, U.S. Department of Health and Human Services (HHS) Secretary Xavier Becerra holds up a flier promoting the Vax Nevada Days lottery after briefing from officials at the Clark County Fire Department Training Facility in Las Vegas.  Most Americans who haven’t been vaccinated against COVID-19 say they are unlikely to get the shots and doubt they would work against the aggressive delta variant despite evidence they do, according to a new poll that underscores the challenges facing public health officials amid soaring infections in some states. (Steve Marcus /Las Vegas Sun via AP)
            
              FILE - In this July 21, 2021 file photo, a signboard marks the location of a city-run popup COVID-19 vaccine clinic in Brownsville, Texas.  Most Americans who haven’t been vaccinated against COVID-19 say they are unlikely to get the shots and doubt they would work against the aggressive delta variant despite evidence they do, according to a new poll that underscores the challenges facing public health officials amid soaring infections in some states. (Denise Cathey/The Brownsville Herald via AP)
            
              FILE - In this file photo dated Wednesday, Feb. 17, 2021, three vials of the Moderna COVID-19 Vaccine are pictured in a new coronavirus vaccination center at the 'Velodrom' (velodrome-stadium) in Berlin, Germany. The European Medicines Agency has recommended approving Moderna’s COVID-19 vaccine for children aged 12 to 17, the first time the shot has been authorized for people under 18. In a decision on Friday, July 23, 2021 the EU drug regulator said research in more than 3,700 children aged 12 to 17 showed that the Moderna vaccine — already given the OK for adults across Europe — produced a comparable antibody response. (AP Photo/Michael Sohn, File)
            FILE - In this Monday, July 19, 2021 file photo, people walk in Oxford Circus, in London. The British government has sought to ease food supply pressures in England by exempting more than 10,000 workers from quarantine rules that had led to staff shortages and empty shelves and fears of panic-buying. However, it has come under criticism Friday , July 23, 2021 for the way it has lifted coronavirus restrictions in England and for not doing more to help other crucial sectors, such as transport, the emergency services and energy industry.  (AP Photo/Alberto Pezzali, File) 
              People and police officers wearing face masks to help curb the spread of the coronavirus walk past a busy crossing at Shinjuku district in Tokyo Friday, July 23, 2021, hours before the opening ceremony of the Summer Olympics starts. (AP Photo/Kantaro Komiya)
            
              A health worker takes a swab sample of a passenger entering the city to test for COVID-19, at a railway station in Ahmedabad, India, Friday, July 23, 2021. (AP Photo/Ajit Solanki)
            
              FILE - In this April 1, 2021, file photo, general practitioner Gyorgy Teleki vaccinates an elderly patient with the second dose of COVID-19 vaccine produced by Chinese Sinopharm in Taplanszentkereszt, Hungary. A new study suggests that a Sinopharm vaccine offers poor protection from COVID-19 among the elderly, raising questions for dozens of countries that have given the Chinese company’s shots to their most vulnerable populations. (Istvan Filep/MTI via AP, File)
            Residents sit at an observation area after receiving their second dose of AstraZeneca COVID-19 vaccine in Mandaluyong city, Philippines Friday, July 23, 2021. Philippine officials said a local transmission of the highly contagious delta variant of the COVID-19 virus has been detected in the country and announced Friday tighter quarantine restrictions in the capital and a weeklong ban on the entry of travelers from hard-hit Malaysia and Thailand. (AP Photo/Joeal Calupitan) U.S. first lady Jill Biden waves as she arrives at Imperial Palace to meet Japan's Emperor Naruhito in Tokyo, Friday, July 23, 2021. (AP Photo/Koji Sasahara, Pool) People wearing face masks to help curb the spread of the coronavirus stand watch near a vendor selling flowers outside a subway station in Beijing, Thursday, July 22, 2021. A senior Chinese health official says China cannot accept the World Health Organization's plan for the second phase of a study into the origins of COVID-19. (AP Photo/Andy Wong) People wearing face masks to prevent the spread of COVID-19 walk at a shopping mall in Beijing, Saturday, July 17, 2021. A senior Chinese health official says China cannot accept the World Health Organization's plan for the second phase of a study into the origins of COVID-19. (AP Photo/Mark Schiefelbein)