Portugal tightens restrictions despite virus vaccine success


              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              A nurse prepares vaccines in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              People queue to get vaccinated against COVID-19 on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. Despite its excellent vaccination record, cases have been rising non-stop over the past two months, although hospitalizations are far away from levels seen in previous surges. (AP Photo/Armando Franca)
            
              A nurse prepares vaccines in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              Nurse Carolina administers a booster shot of the Pfizer vaccine against COVID-19 to a fellow nurse on the first day of a new vaccination center in Lisbon, Wednesday, Dec. 1, 2021. Long lines formed at the Portuguese capital's largest vaccination center to date as authorities there tried to encourage the 2% of the population who are not vaccinated yet, Europe's lowest rate, and to speed up the administration of booster shots. (AP Photo/Armando Franca)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              A nurse prepares vaccines in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              A medical worker walks past covid kit boxes in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              A nurse prepares vaccines in the Wizink Center, currently used for COVID-19 vaccinations in Madrid, Spain, Wednesday, Dec. 1, 2021. Health authorities in the Spanish capital have confirmed a second case of the omicron coronavirus variant in a 61-year-old woman who had returned from a trip to South Africa on Monday. (AP Photo/Paul White)
            
              A couple embrace at Lisbon's international airport, Tuesday, Nov. 30, 2021. Portugal is bringing back some tight pandemic restrictions, less than two months after scrapping most of them when the goal of vaccinating 86% of the population against COVID-19 was reached. (AP Photo/Armando Franca)
            
              A woman pulls a suitcase at Lisbon's international airport, Tuesday, Nov. 30, 2021. Portugal is bringing back some tight pandemic restrictions, less than two months after scrapping most of them when the goal of vaccinating 86% of the population against COVID-19 was reached. (AP Photo/Armando Franca)
            
              A worker wipes the floor by the pediatric emergency entrance at the Hospital Garcia de Orta in Almada, south of Lisbon, Tuesday, Nov. 30, 2021. A sign posted on the door announces that the hospital is closing its pediatric services after finding out that a health worker who had contact with members of a soccer club affected by an omicron coronavirus variant outbreak was also infected with the same strain. (AP Photo/Armando Franca)
            A worker disinfects chairs at a new vaccination center in Lisbon, Tuesday, Nov. 30, 2021. The new center, the biggest in the country, will open Wednesday, Dec. 1. Portuguese health authorities on Monday identified 13 cases of the omicron coronavirus variant among members of a top soccer club and were investigating whether it was one of the first reported cases of local transmission of the virus outside of southern Africa. (AP Photo/Armando Franca) Workers get ready for the opening of a new vaccination center in Lisbon, Tuesday, Nov. 30, 2021. The new center, the biggest in the country, will open Wednesday, Dec. 1. Portuguese health authorities on Monday identified 13 cases of the omicron coronavirus variant among members of a top soccer club and were investigating whether it was one of the first reported cases of local transmission of the virus outside of southern Africa. (AP Photo/Armando Franca) Workers get ready for the opening of a new vaccination center in Lisbon, Tuesday, Nov. 30, 2021. The new center, the biggest in the country, will open Wednesday, Dec. 1. Portuguese health authorities on Monday identified 13 cases of the omicron coronavirus variant among members of a top soccer club and were investigating whether it was one of the first reported cases of local transmission of the virus outside of southern Africa. (AP Photo/Armando Franca) 
              A woman wearing a face mask walks past a COVID-19 awareness sign at Lisbon's international airport, Tuesday, Nov. 30, 2021. Portugal is bringing back some tight pandemic restrictions, less than two months after scrapping most of them when the goal of vaccinating 86% of the population against COVID-19 was reached. (AP Photo/Armando Franca)
            
              People wearing face masks to curb the spread of COVID-19 walk in downtown Lisbon, Monday, Nov. 29, 2021. Portuguese health authorities on Monday identified 13 cases of omicron, the new coronavirus variant spreading fast globally, among members of the Lisbon-based Belenenses SAD soccer club, and were investigating possible local transmission of the virus outside of southern Africa. (AP Photo/Ana Brigida)