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

A highly contagious flu mutation called subclade K is sweeping the nation, raising health concerns about vaccine ...

Super flu cases are surging, with symptoms including high fever, severe body aches, extreme fatigue, cough and lingering ...

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

A new strain called H3N2 subclade K has emerged, raising concerns that the body may not be able to fight it off as well.

Flu symptoms typically lasts at least five days and up to two weeks. Some symptoms, like a cough, may persist even longer ...

Doctors and scientists say this year's influenza season could be tougher than usual, with a new version of the flu virus, ...

Flu is hitting especially hard this winter, and experts believe a mutated version of the virus – known as H3N2 subclade K – ...

The numbers are especially grim in the Big Apple: According to preliminary hospital data collected by New York City’s ...

When the flu strikes, it can feel relentless: rising fever, hacking cough, stuffy nose and sore throat. For many people, ...

“We are seeing the highest number of flu cases ever recorded in a single week in New York State,” State Health Commissioner ...

Flu cases started popping up around Thanksgiving this year. This is the first big increase we’ve seen since this time last ...