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

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

The H3N2 is a new strain of influenza A. The symptoms are described as more intense and contagious than typical seasonal flu.

The CDC says Texas flu is at "very high" levels, as the flu vaccine has been less effective against H3N2 subclade K.

H3N2 subclade K strain — is responsible for 90% of influenza A cases across the U.S., which has led to double the cases in ...

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 ...

There have been more than two dozen flu-related deaths in Massachusetts, and experts anticipate cases continuing to rise.

Health officials warn the H3N2 Clade K variant is spreading rapidly because most residents lack immunity, with ...

The new variant of Influenza A, or H3N2, has been given the nickname 'super flu.' The fast-spreading virus has caused ...

Louisiana ranks among the top states for flu cases nationwide, and health officials expect those numbers to remain high ...