Will Stone - NPR News
Booster shots have been authorized for all U.S. adults, and the government is urging people to get them. But what if you've already had COVID and the vaccine? Here's what scientists say.
After declining most of the fall, new infections are up again in more than half of U.S. states, worrying experts about what the holiday season may bring.
It's not clear why some people who get COVID-19 are plagued with symptoms for many months after being infected, but scientists are investigating what's behind these "long haul" cases.
Many Americans are still making sense of new CDC guidance that vaccinated people no longer have to wear masks in most indoor settings.