Health ❯ Infectious Diseases ❯ Influenza ❯ H3N2

Subclade K

Flu Hospitalizations Double as H3N2 Subclade K Drives Early U.S. Surge

Despite a partial mismatch, the current shot reduces severe illness.

Flu Season Accelerates as H3N2 Subclade K Becomes Dominant in the U.S.

Drifted H3N2 ‘Subclade K’ Drives Early U.S. Flu Uptick Before Holidays

New H3N2 Variant Emerges as Canada’s Flu Season Starts and U.S. Activity Remains Low

New H3N2 ‘Subclade K’ Drives Early Flu Surges as U.S. Officials Urge Vaccination