The influenza A (H1N1) strain currently circulating in India is not a new variant, and most reported infections are causing mild symptoms, scientists at the Indian Council of Medical Research (ICMR) have said. Officials have also ruled out the need for panic despite a recent increase in cases, particularly in Delhi.
According to ICMR officials, nearly 1,800 H1N1 cases have been reported in Delhi during the current season. However, they said the rise does not indicate the emergence of a new strain or an unusual outbreak pattern.
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“There is no need to panic as the cases are largely depicting mild symptoms and mortality rate remains low,” an ICMR official said. The official added that people at higher risk should take additional precautions, particularly while visiting crowded public places.
The ICMR said the influenza A (H1N1) pdm09 viruses currently circulating in India belong to the A/Missouri/11/2025 (H1N1) pdm09-like strain. The viruses are classified under clade 6B.1A.5a2a and subclade D.3.1.1 and have been circulating since 2025.
Scientists further clarified that no new H1N1 strain has been identified in India. They said the influenza viruses currently circulating are also well matched with the vaccine strains recommended for the Northern Hemisphere, suggesting that existing seasonal influenza vaccines remain relevant.
Doctors have attributed the recent increase in influenza cases partly to seasonal conditions. Viral respiratory infections commonly rise during the monsoon, when high humidity, damp surroundings and crowded indoor spaces can facilitate transmission.
Dr Harpreet Kaur, medical superintendent and head of laboratory services and blood centre transfusion medicine and blood banking, haematology and cytology at Aakash Healthcare, said the seasonal increase was not unexpected.
She noted that stagnant water can create favourable conditions for mosquito breeding, while damp and humid weather may contribute to the spread of respiratory infections, particularly in enclosed and crowded environments. According to her, preparedness and timely response play an important role in limiting the impact of seasonal infections.
Seasonal influenza, including H1N1, is generally self-limiting. Common symptoms include fever, cough, headache and body ache, with most people recovering with adequate rest, fluids and appropriate medical care.
However, certain groups remain more vulnerable to complications. Young children, older adults and people with underlying health conditions should take greater precautions and seek medical advice if symptoms become severe or do not improve.
Health experts recommend frequent handwashing, covering the mouth and nose while coughing or sneezing, avoiding close contact with infected individuals and staying home when unwell. These measures can help reduce the spread of influenza and other respiratory infections.
ICMR officials said the situation continues to be monitored through regular surveillance, with necessary public health measures being undertaken. They urged people to remain cautious without becoming alarmed and advised those experiencing persistent or worsening symptoms to consult a doctor promptly.
