Medical experts debunk flu shot myths: vaccines use inactive virus that cannot cause illness. Discover what side effects actually mean for your immunity.

A fast-spreading new flu strain is gaining a reputation as a monstrous “super flu.” The mutation of influenza A(H3N2) called subclade K is driving up infections across the country, including in New ...

Learn how Subclade K, a variant of the influenza A virus, is affecting immune responses and contributing to this year’s ...

Agency cites increased risk of febrile seizure risk in postmarking studies ...

The U.S. health secretary told USA Today that he believed the flu jab was a “potential culprit that I cannot rule out” for ...

Learn more about seasonal flu, including where to get a flu vaccine and how to treat seasonal flu.