Chandigarh, Oct 18: The Tricity region has witnessed its lowest number of dengue cases in four years, with only 160 cases reported so far in 2025 — a steep 94.96% decline from last year’s total of 3,173, according to official data.
Among the three cities, Chandigarh reported the fewest cases at five, followed by Panchkula with 62 and Mohali with 93. In comparison, 2024 recorded 349 cases in Chandigarh, 1,324 in Panchkula, and 1,500 in Mohali.
Dengue, a viral infection transmitted by the Aedes aegypti mosquito that breeds in stagnant water, typically surges during the monsoon and post-monsoon months. Yet, despite higher rainfall this year — over 836 mm from June to September compared to 776.2 mm last year — the disease incidence has remained notably low.
Experts attribute this decline to cyclical immunity patterns and improved preventive measures. Dr. P.V.M. Laxmi, professor at the Department of Community Medicine and School of Public Health, PGIMER, noted that dengue follows a cyclical pattern with outbreaks recurring every few years.
“Those infected in the previous years often develop immunity, which brings down the number of cases,” Dr. Laxmi said.
She added that the population’s acquired immunity, coupled with possible changes in mosquito breeding and survival patterns, could explain this year’s dip.
Public health officials also credit better drainage systems and intensified anti-dengue campaigns for the reduction. “To prevent the viral disease, one should ensure there is no water stagnation around the house,” advised Dr. Sanjay D. Cruz, head of general medicine at Government Medical College and Hospital, Sector 32. “Water coolers, flower pots, buckets, discarded tires and uncovered water tanks are common breeding sites for Aedes aegypti mosquitoes,” he said.
Health authorities continue to urge residents to remain vigilant, as sporadic rainfall and lingering humidity can still create breeding grounds for mosquitoes, even late in the season.
