Myocarditis is a known — but small — side effect of the mRNA Covid vaccines from Pfizer and Moderna, information that federal ...

By 2025, more than 13 billion doses of the vaccine are estimated to have been administered globally, saving untold millions ...

Former Brazilian President Jair Bolsonaro, who has been vacationing in Florida since the beginning of this month, has applied for a tourist visa to prolong his stay in the U.S. Prosecutors are ...

NBC News medical contributor Dr. Natalie Azar joins TODAY to talk about how you can protect yourself from winter viruses, ...