South’s dengue crisis: Cases rise from 3 of 20 in 2021 to 3 of 5 in 2025

Sumit Jha

Sep 26, 2025

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In 2021, if you picked 20 dengue patients randomly across India, only three would have been from the southern states.

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Fast forward to 2025, the ratio has dramatically shifted—now three out of every five dengue cases in the country originate from South India.

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The latest data reveals a startling geographical concentration of dengue fever, with the south accounting for 30,628 cases out of the national total of 49,573 cases recorded till August 2025.

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Multiple interconnected factors have transformed South India into the country’s dengue epicentre.

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The monsoon cycle plays a crucial role in disease transmission patterns. South India receives substantial rainfall and it’s the pattern of precipitation that proves most problematic.