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Exposing people to a potentially fatal disease could hasten understanding of COVID-19 and development of new vaccines and treatments. But the risks of such studies raise serious ethical questions.

CDC Director Rochelle Walensky has signed off on updated versions of the Moderna and Pfizer-BioNTech vaccines that target the original virus and the omicron subvariants.

From India to Israel to white-tailed deer in Iowa harboring the coronavirus, our top COVID stories of the year reveal the ever-changing nature of the world's health crisis.

After virtually disappearing for the last two years, there are troubling clues that the flu could come roaring back this year, to cause trouble alongside COVID.

Both Malcolm Alexander and Frederick Clay were exonerated after spending decades in prison. Clay has received financial compensation for his wrongful conviction, while Alexander still waits.

In The Trainable Cat, feline behavior specialist Sarah Ellis explains how you can train your kitty to come on command, take medicine and stop waking you up in the middle of the night.

It's a common dilemma in this summer of surging travel and surging COVID. If one member of a vacation party comes down with the virus, what steps can be taken to reduce the risk to others?

Individual facilities, which are often private and for-profit, have the authority to limit visits over COVID concerns. But immigrant advocates question whether the decisions are made in good faith.

The Navy has censured the former leader of a bomb-sniffing dog unit in Bahrain following an investigation into allegations of hazing and sexual harassment. The action against Chief Petty Officer Michael Toussaint effectively ends his military career.

The 60-year-old woman, who has not been named, was near the Old Faithful Geyser at the Wyoming national park this week when she stepped through a thin crust over scalding water, park officials said.