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Flu Season

H3N2 Subclade K Fuels Early U.S. Flu Surge With Millions Sick

Officials report preserved protection against severe disease despite a partial vaccine mismatch.

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WHO Says Early H3N2 ‘Subclade K’ Flu Wave Is Straining Hospitals Across Europe

New H3N2 Variant Emerges as Canada’s Flu Season Starts and U.S. Activity Remains Low