WASHINGTON -- Many of the world's richest countries have spent the past year hoarding coronavirus vaccines, buying up enough doses to vaccinate their populations several times over and consistently ...

PHILADELPHIA -- Americans face at least two weeks of uncertainty before major questions may get answered about the omicron variant of the coronavirus. Health experts urge the public to be cautious and ...

SAN FRANCISCO (KGO) -- Now that the omicron variant has reached the U.S. via the Bay Area, the question follows, what happens next for vaccines, public policy and research? UCSF has confirmed they're ...

While the omicron variant appears to be more resistant to COVID-19 vaccines, Dr. Anthony Fauci stressed Wednesday that the vaccines still offer substantial protection against the newly-discovered ...

A new Covid variant is spreading across the U.S. and it may be able to evade protection from current vaccines.

NEWARK, Calif. (KGO) -- The race is underway to produce and use the omicron variant's DNA to determine how well existing vaccines work against it, ahead of the first case surfacing in the U.S. The Bay ...

In "sobering news," omicron can evade the protection initial vaccines give, but boosters increase efficacy and better protect against the newest variant of concern, Dr. Anthony Fauci said Sunday. The ...

JOHANNESBURG - The omicron variant appears to cause less severe disease than previous versions of the coronavirus, and the Pfizer vaccine seems to offer less defense against infection from it but ...

U.S. health officials are on high alert and looking for any cases of the new omicron variant. Questions are also being raised if this new variant will overtake delta. Dr. Otto Yang, a leading ...