More than 40% of people with COVID-19 never show symptoms, study finds. What experts have learned about these cases. December 14, 2021
A year after first COVID-19 vaccine, here's what's next for researchers – and what worries them December 14, 2021
Older Americans make up a majority of COVID deaths. They are falling behind on boosters December 13, 2021
The Omicron variant can likely outcompete Delta — and that could worsen the U.S. Covid-19 epidemic December 10, 2021