Dec 17, 2025 · The main version of flu spreading in the United States right now is H3N2 subclade K. H3N2 is a common strain, but the specific type of it circulating now — subclade K — is what’s new.

Dec 5, 2025 · The CDC reports the new H3N2 subclade K is particularly affecting younger populations as the country enters peak flu season between December and February.

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