A government health worker in protective suit waits to sanitise a street shut down to prevent the spread of the coronavirus in Dharmsala, India, Thursday, Dec. 10, 2020. (AP Photo/Ashwini Bhatia)

FILE - In this Nov. 24, 2020, file photo, Kyla Harris, 10, writes a tribute to her grandmother Patsy Gilreath Moore, who died at age 79 of COVID-19, at a symbolic cemetery created to remember and honor lives lost to COVID-19 in the Liberty City neighborhood of Miami. As officials met to discuss approval of a COVID-19 vaccine on Thursday, Dec. 10, the number of coronavirus deaths has grown bleaker than ever. (AP Photo/Lynne Sladky, File)

Containers to be used as a ward to treat people infected with the coronavirus are set up on the grounds of the Seoul Medical Center in Seoul, South Korea, Thursday, Dec. 10, 2020. South Korea has reported another new 682 cases of the coronavirus, as officials work to expand testing to slow transmissions. (AP Photo/Ahn Young-joon)

A laborer wearing a face mask carries vegetables at a market in Mumbai, India, Thursday, Dec. 10, 2020. India is reporting 31,521 newly confirmed coronavirus infections in the past 24 hours, dropping to just over a third of the peak level seen in mid-September. (AP Photo/Rafiq Maqbool)

FILE - In this Dec. 9, 2020, file photo, test specialist Lester Gopar works at a COVID-19 testing site in Los Angeles. As officials met to discuss approval of a COVID-19 vaccine on Thursday, Dec. 10, the number of coronavirus deaths has grown bleaker than ever. (AP Photo/Jae C. Hong, File)

A hotel has switched on the lights in some rooms to form a heart near the buildings of the banking district in in Frankfurt, Germany, Thursday, Dec. 10, 2020, as the German government discusses further restrictions to avoid the outspread of the coronavirus. (AP Photo/Michael Probst)

A woman wearing a face mask to prevent the spread of the coronavirus stands as a man exits the chapel of Saint George at the top of Lycabettus Hill, as at the background is seen the city of Athens, on Thursday, Dec. 10, 2020. The government said it will maintain core lockdown measures through the Christmas holidays, acknowledging that monthlong restrictions have not reduced COVID-19 cases to the extent it had hoped for. (AP Photo/Petros Giannakouris)

First passengers from Melbourne arrive at Sydney Airport, Australia, Monday, Nov. 23, 2020. Border restrictions were lifted between NSW and Victoria at midnight allowing people coming from Victoria to enter NSW without having to go into 14 day isolation. (Dean Lewins/AAP Image via AP)

A masked pedestrian walks past of a COVID 19-themed mural depicting Leonardo da Vinci's Mona Lisa, Wednesday, Dec. 9, 2020, in Beverly Hills, Calif. (AP Photo/Marcio Jose Sanchez)

A medical professional warms her hands against the cold between drive-thru COVID-19 tests at Lovelace Hospital in Albuquerque, N.M., Wednesday morning, Dec. 2, 2020. (Adolphe Pierre-Louis/The Albuquerque Journal via AP)

Registered nurse Laura Moore, left, swabs a patient during testing for COVID-19 organized by Philadelphia FIGHT Community Health Centers at Mifflin Square Park, Thursday, Dec. 10, 2020, in south Philadelphia. (AP Photo/Matt Slocum)

FILE - In this Dec. 9, 2020, file photo, Katie Ramirez, left, watches as her mother, Claudia Campos, swabs the mouth of her daughter, Hailey, for a COVID-19 test at a testing site in Los Angeles. As officials met to discuss approval of a COVID-19 vaccine on Thursday, Dec. 10, the number of coronavirus deaths has grown bleaker than ever. (AP Photo/Jae C. Hong, File)