Influenza A virus subtype H3N2

This strain is notable because health officials are characterizing it as highly contagious and potentially causing a more severe flu season. Recent reports, including urgent warnings to parents, suggest it may lead to a significant surge in cases. The strain's behavior and its impact on vulnerable populations are key reasons it is being closely monitored by health authorities.

News headlines from mid-November 2025 have highlighted the spread of this H3N2 subclade, with specific alerts issued in regions like the UK and warnings about its high transmissibility. The coverage generally advises the public on the symptoms to watch for and underscores the importance of preparedness as health systems brace for increased cases during the winter season.