Mumbai is seeing a noticeable rise in seasonal illnesses following the early arrival of the monsoon. The Brihanmumbai Municipal Corporation (BMC) has reported a sharp increase in vector-borne and water-borne diseases in 2025. In response, authorities are conducting increased surveillance and preventive efforts across the city.
Between January and mid-June this year:
Cases of gastroenteritis, chikungunya, dengue, and malaria have gone up compared to the same period last year.
Cases of chikungunya jumped from 21 in 2024 to 115.
Malaria cases have risen from 1,612 to 1,973.
Hepatitis cases increased from 248 to 359.
Gastroenteritis has also gone up slightly from 3,478 to 3,577.
Leptospirosis cases have seen a decline, but the city is only at the beginning of the monsoon season. More than 390 gastroenteritis cases and 341 malaria cases were reported in just the first two weeks of June. Although dengue cases dropped slightly last month, conditions for Aedes mosquito breeding remain a concern. These mosquitoes thrive in clean, stagnant water left behind after uneven rainfall.
In response to the spike in monsoon-related illnesses, BMC has expanded health surveillance and taken preventive steps across the city.
As part of its fever survey, BMC collected about 66,000 blood samples. The survey covered around 3.7 lakh households and 17 lakh people. Over 36,000 people have been given preventive treatment for leptospirosis.
As per sources, vector control teams have removed over 37,000 mosquito breeding sites, such as stagnant water in tyres and containers. Fogging has been done in more than 25,000 buildings and over 3.8 lakh homes. Extensive rat control activities have also been carried out.
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