The immune system’s first encounter with a virus or vaccine establishes a “starting template” that shapes its response to new ...

As cold and flu season approaches, the situation is becoming more complex with the recent emergence of the new COVID-19 variant, XEC. COVID-19 and knowledge of its exact properties have evolved quite ...

The question hung in the air like a bad odor, silencing the small group of fully vaccinated and boosted friends and family at my dinner table. "Why not just get omicron and get it over with? It's mild ...

The omicron BQ coronavirus subvariants have risen to dominance in the U.S. as people gather and travel for the Thanksgiving holiday, putting people with compromised immune systems at increased risk.

NEW YORK -- What are the symptoms of omicron? Health experts still don't know if the new variant is causing milder COVID-19, but more indicators are emerging. The World Health Organization's top ...

The U.S. is putting travel restrictions in place in response to a new variant of the coronavirus circulating in southern Africa. The restrictions, which are set to take effect on Monday, are being ...

There's a lot we need to learn — and fast — about the omicron variant. Federal health officials have been scrambling since Thanksgiving to gather critical information to inform the U.S. response. Key ...

For nearly two years, day after day, under exhausting and often dangerous conditions, health care workers across the country have continued to care for the nation's sickest Americans who have fallen ...