A rise in influenza cases raises one question that decides the public health response: is this the same virus behaving seasonally, or a new variant that existing immunity and vaccines do not cover? ICMR's answer here is the first - the virus has been circulating since 2025, and the vaccine strains recommended for the Northern Hemisphere still match it, so the surge reflects seasonal transmission rather than a new threat. That distinction matters because vaccine composition is reviewed twice a year, separately for the Northern and Southern Hemispheres, and a genuine antigenic mismatch would require a change in the recommended composition. Monsoon months typically see influenza cases rise in India because of humidity, temperature swings and more indoor crowding, and the standard precautions - vaccination for high-risk groups, respiratory hygiene, testing of severe acute respiratory illness - remain the response.