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H3N2 influenza explained: Causes, symptoms, risks, and why this flu strain hits harder

H3N2, a potent influenza A subtype, is driving significant flu outbreaks globally, causing substantial hospitalizations, particularly in young children and the elderly. Rapid mutations necessitate annual vaccine updates, while cold, dry weather and indoor gatherings facilitate its spread. The virus employs sophisticated mechanisms to evade the immune system and replicate efficiently.