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These tests are designed to identify people who have been previously exposed to the virus. The Food and Drug Administration is now telling manufacturers they'll have to meet minimum standards.

All it took was one coronavirus to turn the world upside down. But how many more are out there, lurking in animals? And what's the chance they could jump into people and trigger another outbreak?

Once a social-media skeptic, the legendary funnyman, screenwriter and banjo player now says Twitter is "sort of like heaven." His new book collects his best tweets — and some of the hilarious responses he has received from followers.

The US Food and Drug Administration has authorized COVID vaccine boosters for all adults. We look at what this means for people who are considering getting their third shot.

Ayesha Rascoe speaks with Corus International Chief Humanitarian Officer Tamara Demuria about the need for aid in Ukraine as winter approaches.

Migrants sent to Martha's Vineyard by Florida's governor have said they feel like they're being manipulated and are confused.

Kentucky officials are still working to confirm deaths from the past week's flooding. Hundreds of people have already been displaced.

The death toll continues to climb in Turkey and Syria after Monday's catastrophic earthquake. Rescue teams have worked around the clock, against freezing temperatures, trying to find survivors.

NPR's Juana Summers speaks with Wafaa Sadek, country director for International Medical Corps in Syria, about the earthquake's aftermath and how her team of medical professionals are responding.

El Salvador's brutal crackdown on gangs has led to thousands of arbitrary detentions and the militarization of the streets.