Delhi H1N1 Cases Cross 2,300 but No New Strain, Says ICMR Chief

Delhi's H1N1 influenza cases have crossed 2,300, but there is "absolutely no cause for panic," Dr. Rajiv Bahl, Director General of the Indian Council of Medical Research (ICMR) and Secretary of the Department of Health Research, told reporters. He said no new or unusual virus strain has been detected, and that the rise reflects expected seasonal changes.

Genomic surveillance through a network of 73 DHR-ICMR Virus Research and Diagnostic Laboratories found that the circulating Influenza A (H1N1) viruses are A/Missouri/11/2025 (H1N1) pdm09-like viruses, with their haemagglutinin gene placing them in clade 6B.1A.5a2a, subclade D.3.1.1. Bahl said this lineage has been circulating in India since 2025, and that the genetic changes seen are consistent with the normal antigenic drift expected in seasonal influenza, not the emergence of a new or dangerous strain.

Bahl said there is no urgent need for everyone to get a flu vaccine, though people over 65 and those who are immunocompromised may discuss it with their doctor; vaccination is currently a World Health Organization recommendation and not part of India's National Immunization Program. Seasonal influenza is usually mild and self-limiting in healthy people, with symptoms such as fever, cough, sore throat, headache and fatigue, but elderly people, young children and those with underlying conditions face a higher risk of complications.

The public was advised to follow routine precautions: covering the mouth and nose while coughing or sneezing, washing hands frequently, staying home when unwell, and avoiding antivirals or antibiotics without medical advice. The health ministry said people should "remain informed and vigilant, but not alarmed."