Pune has recorded 2,009 suspected dengue cases this year, with nearly 66 per cent reported in August, September, and October, according to data from the Pune Municipal Corporation’s (PMC) health department. The monthly breakdown shows 484 suspected cases reported in August, 508 in September, and 346 in October.All 2,009 suspected cases tested positive for the NS1 antigen, an early screening test used to detect dengue virus infection during the initial days of illness. According to Dr Rajesh Dighe, Assistant Medical Officer of Health at the PMC, officials detected 2,651 mosquito breeding sites across homes, societies, offices, and colleges by October 14 this year, leading the corporation to collect Rs 5.7 lakh in administrative fees.To curb vector growth, insect control authorities have applied abate, a chemical larvicide that kills mosquito larvae before they mature, to stagnant water and storage containers across more than 13 lakh private and public properties. Among the PMC’s 16 wards, Kothrud, Nagar Road-Wadgaon Sheri, and Aundh-Baner have each registered over 200 suspected dengue cases.Also Read | India’s first dengue vaccine approved: DCGI clears Takeda’s Qdenga for those aged 4 to 60Weather, construction, and stagnant storageWhile case management has improved, experts point to several environmental and structural factors fueling the mosquito population. The prolonged hot weather this October has created favourable breeding conditions. Dr Amit Dravid, intensivist at Noble Hospital, noted that ongoing construction activities, particularly in Pune’s suburbs, create prime breeding grounds as open structures collect stagnant water.Also, Pune’s weekly water supply cuts have forced residents to store water, increasing the risk of mosquito proliferation. Officials from the PMC insect control department have appealed to citizens to tightly cover all buckets, drums, and water containers.Dr Aditya Bari, consulting physician and diabetologist at Poona Hospital, emphasised the need for proper storage management.“Dengue mosquitoes can breed in very small amounts of stagnant water, even in hollow vessels containing as little as 50 ml of water. Check balconies and surroundings for water collected in containers, pots, trays, and other objects and empty all water-holding containers regularly,” Dr Bari advised.Story continues below this adAlso Read | Dengue in children: Some early signs parents must pay attention toLocalised mosquito range demands weekly ‘dry days’Highlighting the hyper-local nature of transmission, a recent white paper by Envu India titled The Hundred Metre Disease notes that Aedes aegypti, the mosquito primarily responsible for urban dengue, typically flies an average distance of only 106 meters from where it emerges. This puts homes, apartment buildings, and immediate neighbouring properties at the centre of prevention efforts.Because an Aedes mosquito can develop from an egg to a flying adult in seven to ten days, the report advocates establishing one day every week as a dedicated water-check day. This aligns with World Health Organization (WHO) guidelines to cover, empty, and clean household water containers weekly, as well as India’s national vector-control guidance recommending a weekly “dry day.”The report warns against easily overlooked breeding spots, such as refrigerator drip trays, AC drip trays, plant saucers, roof gutters, and small containers holding standing water.“From October to December, keep weekly checks running until the rains end and scrub every container after the last rains, so the eggs laid this season are gone before 2027,” the report added.