India has highly variable mosquito seasons across its vast geography. The monsoon from June through September is the peak risk period in most of the country, with post-monsoon months (October-November) seeing continued activity. The highest-risk areas include the eastern and northeastern states, coastal regions, and urban centers like Delhi, Mumbai, and Chennai.
Dengue fever is the primary concern in urban areas, with massive outbreaks reported annually. Malaria (P. falciparum and P. vivax) remains endemic in rural and tribal areas, particularly in Odisha, Chhattisgarh, and the northeast. Chikungunya, Zika, Japanese encephalitis, West Nile virus, and lymphatic filariasis are also present.
Aedes aegypti and Aedes albopictus drive dengue transmission in cities and towns. Anopheles stephensi is the primary urban malaria vector, while various Anopheles species dominate in rural areas. Culex species transmit Japanese encephalitis near rice paddies.
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Disease presence data is sourced from WHO, CDC, ECDC, and OpenDengue. This is not medical advice — consult a travel health professional before your trip.