Delhi has recorded 121 dengue cases so far in September, taking the total number of infections reported this year to 432, according to data released by the Municipal Corporation of Delhi (MCD). The city has also reported its highest monthly malaria count of the year, with 64 cases recorded in September so far. No malaria-related deaths have been reported this year. According to the MCD’s weekly vector-borne disease report up to September 12, September’s dengue cases account for more than a quarter of the year’s total. The figure is also the highest number of dengue infections recorded in a single month in the capital so far this year, as the monsoon season continues. Delhi reported 71 new dengue cases in the week preceding September 12, the data showed. West Delhi has reported the highest number of dengue cases this year, with 57 infections, followed by the Central zone with 54 cases and Shahdara North with 50.

Malaria cases also rise

The capital has recorded 183 malaria cases so far this year, including 64 infections in September. This makes September the month with the highest malaria count in 2026 so far. No deaths due to malaria have been recorded in the city this year. Delhi has reported 24 chikungunya cases so far in 2026, compared with 46 cases during the corresponding period last year. Two chikungunya infections have been reported in September so far. The dengue count in Delhi stood at 619 during the corresponding period in 2025, 709 in 2024 and 2,097 in 2023. In 2022, the figure was 295.

MCD intensifies mosquito-control measures

Amid the rise in vector-borne diseases, the MCD has intensified mosquito-control operations across the capital. Its teams have inspected more than 2.79 crore houses for mosquito breeding sites since the beginning of the year. Officials found active mosquito larvae in around 1.47 lakh houses and issued more than 1.10 lakh legal notices for conditions that could encourage mosquito breeding. The civic body has also initiated 11,943 prosecutions and collected ₹15.59 lakh in penalties. In addition, anti-larval spraying has been conducted at more than 13 lakh houses across Delhi so far this year, according to the MCD report.