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

WASHINGTON (AP) — Flu is rising rapidly across the U.S., driven by a new variant of the virus — and cases are expected to ...

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

A new form of the flu, which is highly contagious and aggressive, is sweeping the nation this season. A mutation of influenza ...

Hospitals in the Bay Area are reporting more "influenza-like illness," pointing to a mutation in the strain. Medical experts ...

The United States is seeking a massive surge in flu cases this winter, many of them attributed to the so-called "super flu." Why it matters: An unprecedented rise in flu cases comes as other ...

The latest variant of the flu strain, medical providers said, can cause symptoms in vulnerable populations including older ...

As the end of the year approaches, health authorities are keeping a close watch on a new dominant flu strain circulating ...

This flu season seems to be getting worse by the day, according to health officials. The bulk of this year's cases are being ...

A North Alabama emergency doctor thinks the H2N2 subclade k variant is driving the surge in flu cases in North Alabama, and ...

There are some unusual symptoms being reported with a new and mutated flu variant quickly spreading in the U.S. ahead of ...

Much of the concern this flu season is coming from the spread of subclade K, a subtype of influenza A. Similar subtypes have ...