December 1, 2025

Extended influenza seasons in Australia and New Zealand in 2025 due to the emergence of influenza A(H3N2) subclade K viruses.

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Analysis reveals extended influenza season from subclade K virus outbreaks in Australia and New Zealand, indicating potential global spread.

Extended influenza season occurred due to outbreaks of subclade K virus, impacting Australia and New Zealand.
Subclade K viruses differ genetically from the 2025 A(H3N2) vaccine strain, raising concerns for seasonal effectiveness.
Observational analysis identified subclade K's spread across 34 countries, excluding South America, suggesting global reach.
Further expansion of the subclade K virus is likely during the 2025/26 northern hemisphere winter season.

Dapat et al. (2025) studied this question.

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Analysis reveals extended influenza season from subclade K virus outbreaks in Australia and New Zealand, indicating potential global spread.