Enlarge this image A woman receives a booster shot at a pop-up vaccination clinic in Las Vegas on Dec. 21....
Enlarge this image Sheep and goats stand together on Monday in Schneverdingen, Germany, as they form an approximately 330-foot syringe...
Enlarge this image Secretary of Defense Lloyd Austin, pictured in Seoul, South Korea, in early December, has tested positive for...
Enlarge this image Dr. Anthony Fauci said on Sunday that the CDC was considering adding testing negative to its recommendations...
Enlarge this image Travelers make their way through Miami International Airport on Tuesday. Airlines canceled more than 2,400 U.S. flights...
Enlarge this image An public safety message from the government of South Africa. The country announced on Thursday that it...
Enlarge this image The Carnival Cruise Line's Carnival Sunrise ship is seen in the port of Miami on Dec. 23,...
Enlarge this image A medical worker administers a coronavirus test at a new testing site at the Times Square subway...
Enlarge this image Dr. Anthony Fauci, chief medical adviser to President Biden, says easing quarantine rules for health care workers...
Enlarge this image Employees of Nomi Health check in a long line of people for COVID-19 tests on Tuesday in...
Enlarge this image A man looks at the departures board at Salt Lake City International Airport on Friday. Thousands of...
Enlarge this image New York Gov. Kathy Hochul shortened the quarantine period for many essential workers even as infections have...