Delhi Steps Up Mosquito War: 2.39 Crore Homes Inspected as Dengue, Malaria Cases Remain Lower

Delhi has intensified its fight against dengue, malaria and chikungunya this monsoon, with the Municipal Corporation of Delhi (MCD) combining household surveillance, mosquito-breeding control, larvicide treatment and enforcement.

By August 14, domestic breeding checkers had visited 2,38,89,821 houses in the capital. Mosquito breeding was detected in 91,217 households, while authorities issued 74,591 legal notices against conditions that could support breeding and initiated 6,724 prosecutions. MCD also sprayed larvicide at 3,20,731 houses and reported larvivorous fish surviving at 229 locations.

The campaign has intensified as monsoon conditions favour breeding. During the second half of July alone, MCD conducted 23.8 lakh house visits, compared with 14.33 lakh in the first half. Breeding was detected in 20,431 houses during July 15-31, up sharply from 8,011 in the previous fortnight. MCD attributed the increase partly to an actual rise in breeding, not merely increased inspections.

Beyond residential checks, civic teams have conducted special drives at construction sites, police stations, hospitals and group housing societies. The Delhi government has also pushed entomological surveillance, fever surveillance, public awareness and hospital preparedness, including beds, diagnostics, medicines and insecticides.

The early disease indicators are encouraging. MCD reported 246 dengue, 80 malaria and 19 chikungunya cases through August 14, with no deaths from any of the three diseases. Compared with the same period in 2025, dengue cases were down from 354, malaria from 165 and chikungunya from 27.

However, the effectiveness of the campaign cannot yet be measured conclusively. Case numbers are influenced by rainfall, mosquito density, immunity and reporting practices, while the season typically extends into later months.

A major complication is the unresolved data discrepancy: Delhi Health Minister Pankaj Singh reported 1,379 dengue cases by August 6, whereas MCD counted 246 through August 14. Until authorities reconcile the figures, the lower MCD tally should not alone be treated as proof that mosquito-control measures have reduced Delhi’s overall dengue burden.

The scale of field action is substantial, but sustained surveillance and source reduction remain critical through peak transmission.