Concerns Regarding the New K Strain of Influenza A(H3N2)
November 20, 2025
The circulation of the new K strain of the influenza A(H3N2) virus is worrying experts as it shows increased transmissibility. This flu season started earlier than usual, with cases rising since October. The virus has undergone many mutations, prompting scientists to recommend close monitoring of vaccine effectiveness. Despite these changes, preliminary data indicate that vaccination still provides strong protection against severe illness. However, the outlook for this flu season remains uncertain.