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H3N2

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

Health agencies say the current vaccine still reduces severe outcomes despite a partial mismatch.

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