Flu is rising rapidly across the U.S., driven by a new variant of the virus — and cases are expected to keep growing with holiday travel. That variant, known as “subclade K,” led to early outbreaks in ...

H3N2 is a subtype of influenza A, one of the main categories of seasonal flu viruses that circulate globally each year.

A new version of the common flu is spreading globally, and health officials are monitoring this evolving strain of influenza A(H3N3) Subclade K, which has been increasingly detected worldwide.

Flu cases are rising rapidly across the US due to a new strain called subclade K, a mutated form of the H3N2 influenza A ...

The United States may be heading into its second severe flu season in a row, driven by a mutated strain called subclade K that's behind early surges in the United Kingdom, Canada and Japan. Last ...