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Daily mass testing was ordered in the city of Zhengzhou in what the local government called a "war of annihilation" against the virus.

President Biden has tested positive for COVID -- in another setback as he battles mounting questions over his ability to lead and defeat Donald Trump in the 2024 White House race.

Paxlovid has been highly effective at reducing the risks of hospitalization and death, but some patients report a "Paxlovid rebound," in which the disease returns.

Psychologist James Jackson says people with long COVID experience impaired brain function and mental health issues. He offers some practical advice and support in his new book, Clearing the Fog.

Vaccines may not be as effective for those who are immuno-compromised. Protecting them needs to be made a top priority, says researchers — to keep them safe and to slow the emergence of variants.

U.S. flu vaccines were redesigned after an influenza strain disappeared globally. Physical distancing and masking during the early days of COVID likely pushed the strain into oblivion.

It's been a confusing and fast-changing couple of months for rules about getting a COVID shot. It should be a little easier now, after a panel of vaccine advisers met last week.

If approved, this would be the second booster shot Moderna has issued for people ages 18 and up.

KSFR's John Shannon lived and worked in Italy for about 7 years during the 1980's and 1990's. Earlier this week he contacted his friend James Grant who…

States and health providers report they've dispensed less than half their supply from the government, raising fears that the drugs may go to waste while people who could benefit get sicker.