FILE - In this Jan. 26, 2021, file photo, registered nurse Diane Miller pulls on gloves and other protective equipment as she prepares to enter patient rooms in the COVID acute care unit at UW Medical Center-Montlake in Seattle. The deadliest month of the coronavirus outbreak in the U.S. drew to a close with certain signs of progress: COVID-19 cases and hospitalizations are trending downward, while vaccinations are picking up speed. (AP Photo/Elaine Thompson, File)

An elderly woman gets a shot of China's Sinovac CoronaVac vaccine as part of a priority COVID-19 vaccination program for the elderly at a drive-thru vaccination center in Rio de Janeiro, Brazil, Monday, Feb. 1, 2021. (AP Photo/Silvia Izquierdo)

Edgar Barbaran exchanges a small, empty oxygen tank for this large one in a line of other people's tanks as he waits since the previous day for a refill shop to open in Callao, Peru, Monday, Jan. 25, 2021, amid the COVID-19 pandemic. Some people said they arrived to get in line on Sunday after the store closed in order to be first in line on Monday, while others missed out on Sunday's allotments of refills, approximately 80 tanks, and stayed to wait a second day. (AP Photo/Martin Mejia)

A medical worker collects a swab sample from a woman during coronavirus testing at a center for a private COVID-19 testing in Petaling Jaya, Malaysia, on Monday, Feb. 1, 2021. Malaysian authorities imposed tighter restrictions on movement to try to halt the spread of the coronavirus. (AP Photo/Vincent Thian)

People wait on line outside a regional COVID-19 vaccination site, Monday, Feb. 1, 2021, in Wakefield, Mass. (AP Photo/Elise Amendola)

Cars are waved in as people arrive at the Dodger Stadium parking lot to receive the COVID-19 vaccine Monday, Feb. 1, 2021, in Los Angeles. One of the largest vaccination sites in the nation temporarily shut down Saturday because dozen of protesters blocked the entrance, stalling hundreds of motorists who had been waiting in line for hours. Officials say the Los Angeles Fire Department shut the entrance to the vaccination center at Dodger Stadium. (AP Photo/Mark J. Terrill)

A tired worker in protective overalls bends over to stretch at the entrance of the Hubei Center for Disease Control and Prevention as the World Health Organization team makes a field visit in Wuhan in central China's Hubei province on Monday, Feb. 1, 2021. (AP Photo/Ng Han Guan)

A man wearing face masks to protect against the spread of the coronavirus is reflected on mirrors on the wall of a tailor shop in Tokyo, Monday, Feb. 1, 2021. (AP Photo/Koji Sasahara)

Health workers evacuate a child patient from a fire inside a San Borja Arrarian hospital in Santiago, Chile, Saturday, Jan. 30, 2021. Authorities have not reported deceased or injured patients. (AP Photo/Esteban Felix)

Students wear face masks to protect against the coronavirus at a school, in Peshawar, Pakistan, Monday, Feb. 1, 2021. Pakistani authorities reopened primary and middle schools on Monday and will open universities in the last of a phased reopening due to the pandemic. (AP Photo/Muhammad Sajjad)

A woman, with the Belgium flag and a sign in French reading: "Freedom. Democracy" on her chest, stands next to anti riot police during an unauthorised demonstration against COVID-19 restrictive measures in Brussels, Sunday, Jan. 31, 2021. According to Belgian media around 200 people have been arrested for trying to join a protest against restrictive measures implemented in the country in order to fight the virus, such as a 10pm curfew or the closing of bars and restaurants. (AP Photo/Francisco Seco)

Airport employees unload the first shipment of Russia's Sputnik V COVID-19 vaccine after it arrived at the international airport in El Alto, Bolivia, Thursday, Jan. 28, 2021. (AP Photo/Juan Karita)