Mumbai Monsoon Diseases 2026: BMC Reveals Sharp Increase in Malaria, Dengue and H1N1 Cases

Monsoon-related diseases witnessed a sharp rise across Mumbai in July 2026, prompting the Brihanmumbai Municipal Corporation (BMC) to strengthen disease surveillance, mosquito-control operations, and public health measures across the city.

According to the BMC's latest monthly health report, cases of malaria, dengue, leptospirosis, gastroenteritis, H1N1, and COVID-19 all increased significantly compared to June, highlighting the growing health risks during the peak monsoon season.

Malaria, Leptospirosis Register Biggest Increase

Malaria recorded the steepest rise, with cases increasing by over 110%, from 655 cases in June to 1,380 in July. Leptospirosis also saw a sharp jump, climbing from 33 to 78 cases, marking an increase of more than 136%.

Dengue infections rose from 266 to 466 cases, while gastroenteritis cases increased from 603 to 851. H1N1 (swine flu) cases climbed from 48 to 105, and COVID-19 infections more than doubled from 27 to 58. Chikungunya remained unchanged, with seven cases reported in both months.

Mumbai Disease Statistics: June vs July 2026

BMC Conducts Large-Scale Health Surveillance

To contain the spread of seasonal diseases, the civic body carried out an extensive surveillance drive across the city until July 26.

During the campaign:

• 6,51,336 houses were surveyed.
• 23,09,842 residents underwent health screening.
• 75,650 blood samples were collected for testing.
• 123 health camps were organised.
• More than 52,000 citizens received preventive treatment for leptospirosis.

The BMC said these efforts are aimed at early detection of infections and preventing outbreaks in vulnerable neighbourhoods.

Anti-Mosquito Campaign Intensified Across Mumbai

With mosquito breeding increasing during heavy rainfall, the BMC expanded its Zero Mosquito Breeding Campaign by inspecting thousands of potential breeding sites and eliminating stagnant water.

Malaria Control

• 54,604 potential breeding sites inspected.
• Mosquito breeding detected at 4,569 locations.

Dengue Prevention

• 10,99,325 potential breeding sites inspected.
• Aedes mosquito breeding found at 29,824 locations.
• 2,535 discarded tyres removed.
• 64,546 scrap items cleared to eliminate water-collecting containers.

Officials said anti-larval treatment and routine inspections are being carried out across hospitals, residential areas, construction sites, and public spaces.

Fogging and Rodent Control Measures Expanded

To reduce mosquito and rodent populations, the BMC carried out large-scale fogging operations and rodent-control activities throughout July.

The civic body reported:

• 42,284 buildings covered under fogging operations.
• 5,54,092 chawls and slum dwellings treated.
• 2,623 rats trapped in cages.
• 583 rats eliminated using rodenticides.
• 3,206 rodents controlled in total during the month.

These measures are intended to reduce the spread of mosquito-borne diseases as well as leptospirosis, which commonly spreads through water contaminated by infected rodent urine.

Disease Hotspots Identified Across Mumbai

The BMC has identified several localities that are reporting higher numbers of seasonal illnesses and will remain under intensified surveillance.

Malaria Hotspots

• Byculla
• Madanpura
• Mazgaon
• Andheri
• Amboli
• BDD Chawls
• Sion
• Parel
• Bhoiwada

Leptospirosis Hotspots

• GTB Nagar
• Shivaji Nagar
• Saki Naka
• Dharavi
• T Ward areas

Gastroenteritis Hotspots

• Kurla
• Bandra
• Andheri
• Ghatkopar
• Khar

Health officials said surveillance teams will continue monitoring these areas to detect cases early and prevent further transmission.

BMC Issues Monsoon Health Advisory

The civic body has urged residents to remain vigilant and adopt preventive measures to reduce the risk of mosquito-borne and water-borne diseases.

Residents are advised to:

• Prevent water from stagnating around homes and workplaces.
• Empty and clean containers, flower pots and discarded tyres regularly.
• Use mosquito repellents and protective clothing, especially during dawn and dusk.
• Drink boiled or purified water.
• Maintain proper hand hygiene.
• Avoid eating food from unhygienic places.
• Wear protective footwear while walking through waterlogged areas.
• Seek immediate medical attention if symptoms such as fever, body ache, diarrhoea, vomiting, cough or breathlessness develop.

The BMC has also advised children, senior citizens and people with chronic illnesses to take extra precautions during the ongoing monsoon season.

Rising Monsoon Health Risks

The sharp increase in seasonal diseases underscores the impact of heavy monsoon rains on public health in Mumbai. With mosquito breeding and water contamination becoming more common during this period, civic authorities have intensified surveillance, fogging, sanitation and awareness campaigns to minimise the spread of infections.

Health officials have appealed to citizens to follow preventive measures, maintain cleanliness in their surroundings and seek timely medical care if they experience symptoms, helping reduce the burden of monsoon-related illnesses across the city.