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The omicron variant of the coronavirus may have first developed in a single immunocompromised person.

With extra stress this holiday season, here’s everything heath experts want Americans to know about headaches and migraines and how to treat them.

It’s been 40 years since the first reported cases of AIDS. While treatments have come a long way, a vaccine remains elusive. Karen Weintraub, USA TODAY © Illustration: Andrea Brunty, USA TODAY Network, Photo: Joseph F. Major, AP Marchers during the 21st annual Gay Pride Parade hold a banner that reads "The AIDS crisis is not over," June 25, 1990. As New York's hospitals filled with pneumonia patients last spring, Dr. Michael Gottlieb flashed back to the earliest days of another mysterious illness. For months, Gottlieb had vainly treated a young man with an unrelenting...

Experts say the India variant probably will not cause great harm in the U.S. because of high vaccination rates, but they are watching it.

Fifteen months after the global pandemic officially began, it's still unclear how it originated – and a group of top American scientists is eager for answers. In a letter in the current issue of the journal Science, 18 infectious disease experts, immunologists and epidemiologists joined a global call for more information about the earliest days of the outbreak. There still isn't enough known, they said, to determine whether the coronavirus jumped directly from animals to people or whether it was released from a research laboratory in China. The lack of information, they said, feeds consp...