A late-emerging influenza A mutation known as subclade K weakened protection, but doctors say vaccination still reduces ...

Have you been sick since the new year started? You're not alone; here's what to know about new H3N2 flu strain and its ...

Americans are being urged to be extra vigilant this winter, as a suite of influenza A mutations has created a dominant virus ...

The CDC estimated there have been at least 7.5 million illnesses in the U.S., 81,000 hospitalizations and 3,100 deaths from ...

At least 11 million people have gotten sick, and 5,000 people have died from the flu this season, including nine children.

A highly contagious flu mutation called subclade K is sweeping the nation, raising health concerns about vaccine effectiveness this season. Here are the states at most risk.

Influenza cases are down across the United States, but a new flu strain mutation identified in August is causing a spike in ...

NYC's flu cases hit a decade high with severe impacts and a mismatch between the vaccine and the prevalent strain.

The predicted surge of influenza cases, driven by the new “subclade K” mutation, is hitting Minnesota emergency rooms.

Health officials warn flu cases will likely rise after the holidays, fueld by a mutation of the flu called Subclade k.

At least 11 million people have gotten sick, and 5,000 people have died from the flu this season as vaccination rates wane: ...