Public-health teams in Karnataka are using a new industry report to argue that dengue prevention should focus on the hundred-metre radius around homes and worksites, where Aedes aegypti mosquitoes breed in sumps, curing tanks and puddles left by concrete work.
The 106-metre planning radius
Envu India’s “Hundred Metre Disease” study cites field research estimating the urban dengue vector’s average flight distance at about 106 metres, meaning larvae in a neighbour’s sump can seed infections next door. Karnataka logged 560 dengue cases in January and February alone, according to data quoted in the report, with southern states accounting for roughly 72 percent of India’s 6,927 cases in that period on provisional federal tallies.
Inspectors in Mangaluru and Udupi have already found breeding in underground storage tanks and water used to cure fresh slabs, prompting notices and fines on developers who leave standing water overnight.
Beyond seasonal fogging
Infectious-disease specialists at Bengaluru hospitals note that dengue cases now appear outside the classic post-monsoon spike because construction never pauses and temperatures stay favourable. Aster RV Hospital consultants recommend covering stored water, drying plant trays and reporting pooled water in apartment common areas rather than relying on municipal fogging alone.
State programmes have responded with larval-control teams at urban worksites, but the report pushes developers to assign weekly sump checks to facility managers the way fire-safety walkthroughs are already mandated.
National picture
Union health ministry data through February showed Karnataka among the higher-reporting states, while Kerala and Tamil Nadu posted larger cumulative counts. The lesson for policymakers is that vector control budgets tied only to rainy seasons misallocate effort when breeding habitats sit inside gated communities and IT campuses.
As Bengaluru adds high-rise inventory ahead of office-return trends, treating each basement sump as part of the dengue perimeter may be cheaper than emergency ward surges later in the year.
Apartment associations weigh in
Resident welfare groups in Whitefield and Electronic City said they are adding sump covers and bleach rotation charts to Diwali cleaning checklists, copying a template shared by the Bruhat Bengaluru Mahanagara Palike last month. Pharmacies report steady demand for paracetamol and hydration salts, though hospitalisation rates remain below the peaks seen in 2024 when Tamil Nadu and Kerala posted triple-digit monthly fatalities nationally.
Envu executives argue fogging should remain a breakout tool rather than the default, because space sprays do not reach indoor breeding sites. Their pitch to builders is contractual: tie handover certificates to documented anti-larval treatments at each construction phase, much like structural safety sign-offs.