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Long COVID patients can experience severe energy crashes after physical exertion. New research provides clear evidence that there's a biological basis for the symptoms.

Despite the omicron surge, college students are starting the spring semester on campus – and administrators are bracing for the worst.

Australia and Canada join other countries including the U.S., U.K., India, Japan and several European nations in imposing tougher COVID-19 measures on Chinese travelers amid fears of new variants.

"Today we call on your administration to do what so many states and other countries already have: accept that COVID-19 is endemic," the dozens of Republicans write in a letter.

The new at-home COVID treatment is currently available in limited quantities to states and territories. Some states will get as few as 120 courses of treatment at first.

If you've got a fever, cough, aches and pains, and you're wondering, "What virus got me this time?" Now you can find out, without taking a trip to the doctor.

Even if you don't have long COVID, it can still take weeks to recover — much longer than the isolation period implies. Millions of Americans are finding that this still majorly disrupts their lives.

The Food and Drug Administration approved the next round of COVID-19 vaccines, but they come with restrictions. NPR wants to know your questions about the new guidance.

The Biden administration said that Medicare recipients will be able to get up to eight tests a month, free of charge.

Researchers found that people who had COVID-19 were about 40% more likely to develop diabetes within a year after recovering, compared to participants in a control group.