Health ❯ Infectious Diseases ❯ Influenza ❯ Influenza A

H3N2 Subclade K

Flu Visits Hit Record Levels as Drifted H3N2 Variant Drives Early U.S. Surge

CDC warns the season has not peaked, with vaccines still reducing severe cases despite a partial mismatch.

Flu Surges Nationwide as H3N2 Subclade K Dominates, Straining Hospitals Before Holidays