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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.

Fifteen cities in Italy, most of them in the country's center and south, were under heat advisories. Czech temperatures soared to a new record high. European countries father north also sweltered.

Actor Gene Hackman died of heart disease a full week after his wife died from hantavirus in their New Mexico hillside home, authorities revealed Friday.

An anthropologist put out a call: Take a photo of 15 essential items that help you cope.. She heard from 1,000-plus people in 50 countries. There's a lot of laptops — as well as wonderful surprises.

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.

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.

Organizers at Roland-Garros said Serbian tennis star Novak Djokovic should be allowed to compete at the French Open thanks to loosened COVID rules in France.