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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.

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

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.

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…

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.

The U.S. will soon mark two years since the first confirmed case of COVID-19 in the country, and the number of new infections has never been higher. Meanwhile, travelers are facing canceled flights.

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.

The North's official news agency also reported that Kim's sister blamed the COVID outbreak on leaflets flown from across the border from South Korea, while warning of deadly retaliation.

So many people caught the omicron variant over the winter that almost 60% of everyone in the U.S. — including most children — now have antibodies to the virus in their blood, the CDC said Tuesday.

The city's chief executive said the mask requirement will end outdoors and indoors, but some high-risk premises including hospitals and elderly homes can still require people to wear masks.