Health

FILE - In this April 1, 2020, file photo Dr. Mark Ghaly, secretary of the California Health and Human Services, gestures to a chart showing the impact of the mandatory stay-at-home orders during a news conference ,at the Governor's Office of Emergency Services in Rancho Cordova, Calif. On Saturday, California will impose another, partial overnight curfew to stem a recent surge in coronavirus cases. Ghaly said that about 12% of the new cases will be hospitalized in coming weeks, and the cumulative increase could soon threaten to swamp the state's healthcare system as it has in other states. The curfew will run from 10 p.m. to 5 a.m. (AP Photo/Rich Pedroncelli, Pool, File)

FILE - In this Nov. 9, 2020, file photo, pedestrians walk past Pfizer world headquarters in New York. Pfizer said Friday, Nov. 20, 2020, it is asking U.S. regulators to allow emergency use of its COVID-19 vaccine, starting the clock on a process that could bring limited first shots as early as next month and eventually an end to the pandemic -- but not until after a long, hard winter. (AP Photo/Bebeto Matthews, File)

What does emergency use of a COVID-19 vaccine mean? AP Illustration/Peter Hamlin

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Motorists wait in long lines to take a coronavirus test in a parking lot at Dodger Stadium, Wednesday, Nov 18, 2020, in Los Angeles. (AP Photo/Ringo H.W. Chiu)

FILE - In this Nov. 12, 2020, file photo, travelers make their way through the Minneapolis-St. Paul International Airport during the coronavirus pandemic. With the coronavirus surging out of control, the nation’s top public health agency advised Americans on Thursday, Nov. 19, not to travel for Thanksgiving and not to spend the holiday with people from outside their household.(Elizabeth Flores/Star Tribune via AP, File)

President-elect Joe Biden and Vice President-elect Kamala Harris participate in a meeting with the National Governors Association's executive committee at The Queen theater, Thursday, Nov. 19, 2020, in Wilmington, Del. (AP Photo/Andrew Harnik)

FILE - This May 4, 2020, file photo provided by the University of Maryland School of Medicine, shows the first patient enrolled in Pfizer's COVID-19 coronavirus vaccine clinical trial at the University of Maryland School of Medicine in Baltimore. Pfizer announced Wednesday, Nov. 18, 2020, more results in its ongoing coronavirus vaccine study that suggest the shots are 95% effective a month after the first dose. (Courtesy of University of Maryland School of Medicine via AP, File)

Patrick Marks, left, helps customer Jesus Chavez at Beck's Shoes in the Sutter County committee of Yuba City, Calif., Tuesday, Nov. 17, 2020. Gov. Gavin Newsom announced Monday that due to the rise of COVID-19 cases, Sutter was among the counties that has been moved to the state's most restrictive set of rules, which prohibit indoor dining and requiring people to wear face masks in public. The new rules began on Tuesday. (AP Photo/Rich Pedroncelli)