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H3N2

Vaccination Symptoms Subclade K Subvariant K Variants Hong Kong Flu Epidemiology Outbreaks

New H3N2 ‘Subclade K’ Drives Early U.S. Flu Surge as New York Sets Weekly Case Record

A partially mismatched vaccine still reduces severe illness, prompting calls for shots and early treatment.

Drifted H3N2 Variant Drives Early U.S. Flu Rise as Hospitalizations Increase

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