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.

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 ...

A variant of influenza A, H3N2, is spreading across the U.S., with low vaccination rates contributing to infection rates.

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

Hospitals are filling up across the state with people experiencing flu-like symptoms. The CDC says Kansas is one of several ...

Subclade K has become the dominant form of flu and is slightly different from the virus targeted by this year’s flu vaccine.

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

Viruses can change and alter their genetic make-up. When these changes occur, the virus may become more or less of a threat to the human host. Virologists are therefore interested in tracking the ...