Pedestrians wearing face masks as a precaution against the coronavirus, walk near the statues with masks in Incheon, South Korea, Sunday, Feb. 7, 2021. (AP Photo/Lee Jin-man)

Customers wearing face masks to protect against the spread of the coronavirus, carry peach blossom trees at the flower markets in Victoria Park of Hong Kong, Saturday, Feb. 6, 2021. Traditional Lunar New Year flower markets opened Saturday in Hong Kong, after a government virus policy U-turn. At the biggest venue, Victoria Park next to the popular downtown shopping district of Causeway Bay, the eerie emptiness is in stark contrast to the usual bustle of capacity crowds.(AP Photo/Kin Cheung)

Workers pull boxes loaded with COVID-19 vaccines before a handing over ceremony at Phnom Penh International Airport, in Phnom Penh, Cambodia, Sunday, Feb. 7, 2021. Cambodia on Sunday received its first shipment of COVID-19 vaccine, a donation of 600,000 doses from China, the country's biggest ally. Beijing has been making such donations to several Southeast Asian and African nations in what has been dubbed "vaccine diplomacy," aimed especially at poorer countries like Cambodia. (AP Photo/Heng Sinith)

FILE - In this Nov. 30, 2020 file photo, Thabisle khlatshwayo, who received her first shot for a COVID-19 vaccine trial, receives her second AstraZeneca shot at a vaccine trial facility set at Soweto's Chris Sani Baragwanath Hospital outside Johannesburg, South Africa. South Africa suspended on Sunday Feb. 7, 2021 plans to inoculate its front-line health care workers with the AstraZeneca vaccine after a small clinical trial suggested that it isn't effective in preventing mild to moderate illness from the variant dominant in the country. (AP Photo/Jerome Delay, File)

A Chinese couple wear face mask walks with Chinese lunar new year decoration at China town in Kuala Lumpur, Malaysia, Sunday, Feb. 7, 2021. The movement control order (MCO) currently enforced across the country, has been extended to Feb. 18, effectively covering the Chinese New Year festival that falls on Feb. 12 this year. (AP Photo/Vincent Thian)

Face coverings on the statues of former US President Franklyn D. Roosevelt, left, and former British Prime Minister Winston Churchill in Mayfair, London, Sunday, Feb. 7, 2021, as the third national lockdown, due to the COVID-19 outbreak, continues. (AP Photo/Alberto Pezzali)

Dr. Dieudonne Wend-Kuni Kientega tends to a COVID-19 patient at Ouagadougou's Bogodogo Medical Teaching Hospital Thursday Feb. 4, 2021. Since November, the conflict-riddled West African nation of Burkina Faso faces a much deadlier second coronavirus wave than the first and health officials worry a lack of knowledge and adherence to coronavirus measures is making it hard to rein in. (AP Photo/Sam Mednick)

A mortuary worker disinfests the body of a person who died of COVID-19 ahead of a funeral at Memora mortuary in Girona, Spain, Thursday, Feb. 4, 2021. Spain's health ministry said Wednesday that the southern European nation has surpassed 60,000 fatalities from COVID-19. The ministry reported 565 new deaths in the previous 24 hours, taking the total death count since the start of pandemic to 60,370. (AP Photo/Emilio Morenatti)

Medical personnel wearing protective equipment treat COVID-19 patients in an intensive care ward for coronavirus patients at Ziv Medical Center in the northern Israeli city of Safed, Sunday, Feb. 7, 2021. (AP Photo/Oded Balilty)

Boxes of the first shipment of 500,000 doses of the AstraZeneca coronavirus vaccine made by Serum Institute of India, donated by the Indian government, await distribution at the customs area of the Hamid Karzai International Airport, in Kabul, Afghanistan, Sunday, Feb. 7, 2021. (AP Photo/Rahmat Gul)

A dog sits next to numbered crosses at the Iraja cemetery, where many COVID-19 victims are buried in Rio de Janeiro, Brazil, Friday, Feb. 5, 2021. (AP Photo/Silvia Izquierdo)

General view of a deserted street in Mayfair, London, Sunday, Feb. 7, 2021, as the third national lockdown, due to the COVID-19 outbreak, continues. (AP Photo/Alberto Pezzali)