Rare but deadly blood clots tied to J&J and AstraZeneca's vaccines were caused by an autoimmune reaction that some people are predisposed to, researchers found.

Drugmaker Johnson + Johnson said Monday it has paused the advanced clinical trial of its experimental coronavirus vaccine because of an unexplained illness in one of the volunteers. "Following our ...

Researchers have identified the molecular mechanism behind vaccine-induced immune thrombotic thrombocytopenia, or VITT, a rare clotting disorder that emerged in a small number of people who received ...

To help answer common vaccine questions, we consulted Dr. Stanley Perlman, a professor at the University of Iowa’s Carver College of Medicine and a member of the U.S. Food and Drug Administration’s ...

Add Yahoo as a preferred source to see more of our stories on Google. Confusion over vaccine recommendations in the U.S. has hit a boiling point as the responsibility for handling them has spilled ...