The spread of the COVID-19 delta variant is raising infections, leading some companies and governments to require vaccinations and raising concerns about the U.S. economic recovery.
Dozens of Americans are rolling up their sleeves for a third dose of COVID-19 vaccine -- this time, shots tweaked to guard against a worrisome mutated version of the virus.
The makers of COVID-19 vaccines are figuring out how to tweak their recipes against worrisome virus mutations — and regulators are looking to flu as a blueprint if and when the shots need an update.
States are loosening their coronavirus restrictions on restaurants and other businesses because of improved infection and hospitalization numbers but are moving gradually and cautiously, in part because of the more contagious variant taking hold in the U.S.
California on Wednesday announced the nation's second confirmed case of the new and apparently more contagious variant of the coronavirus, offering a strong indication that the infection is spreading more widely in the United States.