That all followed a huge spike in flu activity in New York City, Long Island, and North Jersey in the first week of December.

A dozen of the iconic swans that live in the heart of downtown Orlando, Florida, have died in recent days of an unknown cause ...

Flu activity is increasing across the U.S. amid holiday travel and gatherings, according to the latest data from the CDC.

The “super flu” is a variant of influenza A H3N2 called subclade K. Historically, similar variants have caused more severe ...

Current data from the CDC suggests the H3N2 strain and subvariant K — the dominant subvariant in the U.S. — are more ...

A dozen swans have died at Lake Eola in the past week, leaving Orlando officials fearing another outbreak of bird flu at the ...

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

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

The state of New York is among those most heavily hit. For the week ending Dec. 20, the state reported its highest number of ...

Thousands of new flu cases​ in New York led to a 38% jump from the previous week, according to state health officials.

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

The flu season is hitting in full force, especially in New York, Colorado and Louisiana, where flu-like activity is very high ...