The torchlight matters more than the phone light. That is the first thing Tilakavathi (name changed), an ASHA worker with over a decade of experience in Tamil Nadu, teaches every household she visits, because phone flashlights are too weak to catch mosquito larvae wriggling in a water drum. 

She carries a proper torch instead, crouches over buckets and tanks that families assume are clean simply because the water inside looks clear, and explains why what looks harmless is not. When she does spot larvae, she drops in medicine to kill them before the water is emptied out.

It is a small ritual repeated across the country every monsoon, by women who know India's dengue and malaria burden more intimately than any dashboard does. In Delhi, ASHA worker Joshitha wades through flooded lanes carrying survey forms, aware that falling ill herself during this season costs her the incentive pay tied to her monthly targets. 

In Karnataka, ASHA worker Rekha spends her days going house to house checking drums and washrooms for stagnant water, work so undervalued that, as she puts it, people do not believe her when she tells them what she earns for it. 

Their fieldwork, repeated in village after village, keeps surfacing the same gaps in what households believe about dengue and malaria. Closing those gaps is, in many neighbourhoods, the difference between an outbreak and a quiet season.

1. Clean water breeds dengue, not just dirty water

The most stubborn myth Tilakavathi runs into on her rounds is the assumption that mosquitoes only breed where things look unhygienic. The Aedes aegypti mosquito that spreads dengue actually prefers clean, still water, and can lay eggs in a puddle no larger than a coin. 

Overhead tanks, desert coolers, flowerpot trays and refrigerator drip trays are common breeding spots precisely because they look too clean to worry about. 

Anopheles mosquitoes, which carry malaria, are less particular and breed in both clean and dirty stagnant water, including open drains and puddles on........

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