The variant is part of the H3N2 strain, but it’s distinct enough to make it materially different. It comes as peak influenza ...

They are bracing for a brutal season, driven by a new and alarming variant that is expected to circulate widely.

The latest data on respiratory illness in the United States shows that shoppers and merry-makers are spreading more than just holiday cheer: They’re also passing around germs. In many cases, it’s a ...

A new flu virus variant has been sweeping across the United States, raising questions about the efficacy of this year’s flu vaccines. Medical professionals in Western Pennsylvania say even though they ...

A new variant of influenza H3N2 is spreading in other countries. But that could mean the U.S. is in for a rough flu season. The mutated strain, known as subclade K, is causing a surge in cases in the ...