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Vaccine Effectiveness

Public Health Recommendations Influenza Strains Vaccine Strains H3N2 Strain Antigenic Drift UK Health Security Agency Immunity

Drifted H3N2 Subclade K Drives Early Flu Surge as New York ER Visits Hit Decade High

Despite reduced protection against infection, this season’s flu shots still lower the risk of severe illness.

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

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