Researchers have identified the molecular mechanism behind vaccine-induced immune thrombotic thrombocytopenia, or VITT, a ...

A rare but serious clotting disorder linked to certain COVID-19 vaccines and natural adenovirus infections has puzzled ...

Stock image of a Covid vaccine clinic. Scientists are trying to understand why a small number of people may develop adverse reactions to the Covid vaccine. Researchers from Yale analyzed the blood of ...

After years of work, scientists have solved the mystery of an unusual side effect that impacted some recipients of the Oxford ...

PHILADELPHIA (WPVI) -- Local medical experts who spend their careers researching viruses and vaccines say we should expect a small number of people to have allergic reactions to the vaccine, but only ...

CHAPEL HILL, N.C. -- As the US Food and Drug Administration considers whether to authorize emergency use of Pfizer and BioNTech's COVID-19 vaccine, medical experts are paying close attention to ...

The lasting effects of long COVID rage on. Over 20 million Americans are believed to have the debilitating post-infection ...

Simultaneous administration of a COVID-19 mRNA booster shot and the seasonal influenza vaccine slightly increased the risk of systemic reactions during the following week compared with a booster shot ...

SAN FRANCISCO (KGO) -- Five Bay Area counties say local health providers received COVID-19 vaccine doses from a particular Moderna lot now being paused due to possible allergic reactions. Those ...