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Effectiveness

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Flu Surges to 25-Year High as H3N2 ‘Subclade K’ Drives U.S. Wave

Early evidence suggests this season’s vaccine still offers meaningful protection against the drifted strain.

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

Mutated H3N2 Strain Spurs Early Flu Rise as UK Admissions Climb and California, Chicago Flag Increases

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