A medical worker wearing protective gears takes sample at a coronavirus testing site in Seoul, South Korea, Monday, Dec. 28, 2020. South Korea has confirmed its first cases of a more contagious variant of COVID-19 that was first identified in the United Kingdom. (Park Ju-sung/Newsis via AP)

Administrative worker Veronica Esparza, right, hands a COVID-19 testing kit to a woman at a testing site in Los Angeles, Sunday, Dec. 27, 2020. Hospitals in central and Southern California are quickly running out of intensive care unit beds for coronavirus patients and state officials are poised to extend the strictest stay-at-home orders there as conditions worsen before the post-holiday surge hits. (AP Photo/Jae C. Hong)

Administrative workers Leslie Castillo, far left, and Veronica Esparza check in people at a COVID-19 testing site in Los Angeles, Sunday, Dec. 27, 2020. Hospitals in central and Southern California are quickly running out of intensive care unit beds for coronavirus patients and state officials are poised to extend the strictest stay-at-home orders there as conditions worsen before the post-holiday surge hits. (AP Photo/Jae C. Hong)

A member of the vaccination team at a nursing home holds a dose of the Covid-19 vaccine in Berlin, Germany, on Sunday, Dec. 27, 2020. The first shipments of coronavirus vaccines developed by BioNTech and Pfizer have arrived across the European Union, authorities started to vaccinate the most vulnerable people in a coordinated effort on Sunday. (Kay Nietfeld/Pool via AP)

Mihaela Anghel, left, a Romanian nurse, gets the first COVID-19 vaccine administered in the country in Bucharest, Romania, Sunday, Dec. 27, 2020. Anghel is the nurse who registered and processed Romania's first official COVID-19 patient, on Feb. 27 2020. (AP Photo/Andreea Alexandru)

Slawomir Butkiewicz, left, the paramedic of the Interior Ministry hospital in Warsaw, the capital's main COVID-19 hospital, is getting the coronavirus vaccination in Warsaw, Poland, Sunday Dec. 27, 2020. (AP Photo/Czarek Sokolowski)

Waldemar Wierzba,left, the director of the Interior Ministry hospital in Warsaw, the capital's main COVID-19 hospital, is getting the coronavirus vaccination in Warsaw, Poland, Sunday Dec. 27, 2020. Wierzba was the second person to be vaccinated in Poland as part of a European Union rollout on Sunday. (AP Photo/Czarek Sokolowski)

Registered nurse Leslie Clark, right, puts on a new pair of protective gloves to collect a nasal swab sample at a COVID-19 testing site in Los Angeles, Sunday, Dec. 27, 2020. Hospitals in central and Southern California are quickly running out of intensive care unit beds for coronavirus patients and state officials are poised to extend the strictest stay-at-home orders there as conditions worsen before the post-holiday surge hits. (AP Photo/Jae C. Hong)

Dirk Heinrich, medical director of the Hamburg Vaccination Center at the exhibition halls, accompanies the arrival of the Covid-19 vaccine at the Hospital zum Heiligen Geistin Hamburg, Germany, Suday, Dec. 27, 2020. Corona vaccinations with the Covid-19 vaccine from BioNTech Pfizer began in Germany on Sunday. (Christian Charisius/dpa via AP)

Registered nurse Leslie Clark puts on a new pair of protective gloves after collecting a nasal swab sample at a COVID-19 testing site in Los Angeles, Sunday, Dec. 27, 2020. Hospitals in central and Southern California are quickly running out of intensive care unit beds for coronavirus patients and state officials are poised to extend the strictest stay-at-home orders there as conditions worsen before the post-holiday surge hits. (AP Photo/Jae C. Hong)

Nurse Ann-Louise Broberg injects a COVID-19 vaccine to nursing home resident Gun-Britt Johnsson in Mjolby, Sweden, Sunday, Dec. 27, 2020. Gun-Britt was the first in Sweden to receive the vaccine. (Stefan Jerrevang/TT News Agency via AP)

People wearing face masks to help curb the spread of the coronavirus walk in a business district in Tokyo Monday, Dec. 28, 2020. Japanese Prime Minister Yoshihide Suga says he plans to submit legislation that will make coronavirus measures legally binding for businesses, punish violators and include economic compensation as his government struggles to slow the ongoing upsurge.(Kyodo News via AP)

Japanese Prime Minister Yoshihide Suga speaks to reporters at the prime minister's office in Tokyo, Monday, Dec. 28, 2020. Suga says he plans to submit legislation that will make coronavirus measures legally binding for businesses, punish violators and include economic compensation as his government struggles to slow the ongoing upsurge.(Kyodo News via AP)

Medical workers wearing protective gear prepare for a coronavirus test at a coronavirus testing site in Seoul, South Korea, Sunday, Dec. 27, 2020. (Park Min-suk/Newsis via AP)

A nurse holds a vial containing the first five doses of COVID-19 vaccine administered in the country in Bucharest, Romania, Sunday, Dec. 27, 2020. (AP Photo/Andreea Alexandru)

Panayiota Loizou, 88, the first patient in Island receives from a nurse the vaccine of Pfizer BioNtech against the COVID-19, at a care home in Nicosia, Cyprus, on Sunday, Dec. 27, 2020. Cyprus started today the vaccination program against COVID-19. (Katia Christodoulou/Pool Photo via AP)

Mihaela Anghel, left, a Romanian nurse, waits to get the first COVID-19 vaccine administered in the country in Bucharest, Romania, Sunday, Dec. 27, 2020. Anghel is the nurse who registered and processed Romania's first official COVID-19 patient, on Feb. 27 2020. (AP Photo/Andreea Alexandru)

A bottle of hand sanitizer is placed in a subway station for public use to protect against the coronavirus in Seoul, South Korea, Sunday, Dec. 27, 2020. (AP Photo/Lee Jin-man)

A man wearing a face mask walks near a banner displaying precautions against the coronavirus at a subway station in Seoul, South Korea, Sunday, Dec. 27, 2020. The banner reads: "Social distancing for public transportation." (AP Photo/Lee Jin-man)