India Pharma Outlook Team | Tuesday, 29 September 2026
Flu surveillance flags H1N1 as India’s dominant strain this September, with the latest WHO data showing the virus in three out of every four influenza-positive samples.
Routine monitoring for weeks 36 and 37 of 2026 shows India’s H1N1 share at 75 percent, well above the 50 percent regional average across South-East Asia.
The finding gives health authorities a clear early signal of the circulating pattern and highlights the value of continuous surveillance in tracking seasonal influenza.
Experts note that H1N1 remains a familiar seasonal virus, yet certain groups face higher risk of complications and need targeted protection.
The World Health Organization reports that 817 of 3,632 samples tested positive for influenza across the South-East Asia region, producing an overall positivity rate of 22 percent. Within this pool, India records a distinctly higher proportion of A(H1N1)pdm09.
The same strain also leads in Bhutan (97 percent) and Thailand (74 percent), confirming its strong presence across parts of the region this September.
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Key surveillance numbers stand out clearly:
These figures come from WHO’s regular influenza surveillance network and provide an objective snapshot rather than isolated outbreak reports.
Dr Rommel Tickoo, senior director of internal medicine at Max Hospital, states that H1N1 continues to behave as a seasonal strain. He identifies higher complication risks among older adults, pregnant women, young children, and people with underlying illnesses. He advises vaccination, consistent respiratory hygiene, early testing when symptoms appear, and timely antiviral treatment for high-risk patients.
The elevated H1N1 share in India offers a practical guide for the next two to three months of the flu season. Health systems can prioritize vaccine messaging and clinical readiness for the groups Dr Tickoo highlights.
Continuous surveillance will track whether the 75 percent dominance holds or shifts as the season progresses. The current data already equip doctors and public health teams with a clear picture of the dominant circulating virus and the populations most likely to need extra attention.
Flu surveillance has identified H1N1 as the clear dominant strain in India this September. The 75 percent share of positive samples exceeds the regional average and underlines the importance of ongoing monitoring. Vaccination, hygiene measures, and prompt care for high-risk individuals remain the most effective responses as the season continues.
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