A particularly infectious subvariant of influenza is keeping emergency room numbers high and causing especially severe ...

A ferocious surge of flu cases is linked in part to a variant that has not been dominant in the past few years — resulting in ...

A new flu strain has been detected, with the variant dubbed influenza A subclade K. How severe is the strain and does the ...

WASHINGTON (AP) — 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 ...

California officials warn of an increase in flu-related hospitalizations and confirm a second severe-flu-related death.

Louisiana ranks among the top states for flu cases nationwide, and health officials expect those numbers to remain high through the New Year.