Dengue cases in the city have dropped sharply this year, with the district recording 24 positive cases till September, the lowest figure for the corresponding period in the past four years. However, health officials and experts have cautioned that the decline should be viewed carefully as the monsoon and post-monsoon transmission period is still underway.
Mohali reported zero cases in January, February and March, followed by two in April, one in May, three in June, and four in July. The month-wise data shows that cases remained low during the first half of the year but began rising gradually. Rainfall, temperature, and humidity are important factors Dr. “Dengue transmission depends on the availability of suitable breeding sites and climatic conditions. Excessive rainfall can sometimes wash away mosquito larvae, while lower-than-expected or poorly distributed rainfall may create fewer breeding opportunities. Temperature is equally important, as mosquitoes require a suitable range of temperature and humidity for survival and breeding. Dr. She cautioned that the decline should be interpreted carefully as the post-monsoon transmission period is still ongoing.
Mohali recorded 486 dengue-positive cases during January-September in 2023, followed by 320 cases in 2024 and 58 in 2025, according to district health data. This year, the figure stands at 24, nearly 59 % lower than last year and more than 90 % lower than the corresponding figures of 2023 and 2024. August recorded the highest monthly count so far at 10 cases, while four provisional cases have been reported in September. The comparison data also shows that 7,011 samples were tested in 2023, 10,553 in 2024 and 10,945 in 2025. In September alone, the district had recorded 308 positive cases in 2023, 268 in 2024 and 27 in 2025. Varsha, head of department, microbiology, Government Medical College and Hospital, Sector 32, Chandigarh, said the lower dengue incidence depends on multiple factors, involving vector density, climatic conditions, population susceptibility and dengue serotype circulation.
Changes in these conditions can therefore affect mosquito density and dengue transmission.
Rajesh Gera, director and head, internal medicine and infectious diseases, Park Hospital, Panchkula, said weather conditions, particularly rainfall, temperature and humidity, play an important role in dengue transmission.
