Influenza cases have significantly increased in Delhi this season, with H1N1 being prevalent.
Delhi had recorded 2,612 H1N1 cases by Thursday, while the number of influenza A cases had crossed 3,300, according to the information in the graphic. The lineage has been circulating in India since 2025, and genetic changes observed so far remain consistent with seasonal influenza. H1N1 and Covid-19 are caused by different viruses.
Symptoms alone, therefore, cannot confirm an H1N1 infection.
The Indian Council of Medical Research (ICMR) has said the circulating H1N1 virus is showing expected seasonal changes. NEW DELHI: Influenza cases have risen sharply in Delhi this season, with H1N1 accounting for the largest share of influenza A cases. However, the increase does not appear to be linked to a new or unusually dangerous strain, with the circulating virus showing changes broadly consistent with normal seasonal influenza. There is no evidence of a new or unusually dangerous strain. Doctors caution that these symptoms can overlap with H3N2 and other respiratory viruses, dengue, chikungunya and malaria. Older adults, young children and pregnant women are among those at higher risk. People with diabetes, asthma, COPD, chronic heart or lung disease, or weakened immunity also need to be particularly careful. The Covid vaccine does not protect against H1N1, which has a separate influenza vaccine. Combined mRNA vaccines covering influenza and Covid are not commercially available.