A Novel H3N2 Variant on the Rise: What Clinicians and Public Health Systems Need to Know for 2025–26
Highlight
• A rapidly evolving influenza A(H3N2) subclade (referred to as subclade K) has been reported in the southern hemisphere and is rising in the UK, with mutations that differ from the 2025 vaccine strain.
• Early international reports suggest increased case counts concentrated in children and young adults; severity signals and geographic spread to the northern hemisphere remain uncertain.
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This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.