"Mohalle mein dengue phail raha hai" — Dengue Prevention in Indore, Practically

"Mohalle mein dengue phail raha hai — ab kya karein?"

We are asked this every August, usually by someone whose neighbour's son was admitted last week. The advice they have already collected is a mixture of the useful and the useless: get the fogging done, buy a net, shut the windows in the evening, clean the drains.

The scale is real enough to justify the worry. The World Health Organization estimates 100–400 million dengue infections a year and recorded a historic high of over 14.6 million reported cases in 2024. India's National Center for Vector Borne Diseases Control logged 233,519 cases nationally that year, and Madhya Pradesh alone reported 10,224 — up from 6,979 the year before.

Some of the advice families collect is worth doing. Some is aimed at the wrong mosquito entirely. The reason so much dengue advice misfires is that the mosquito carrying dengue behaves nothing like the one most of us grew up swatting — and once you know its two habits, everything sensible follows.

Mohalle mein dengue phail raha hai — ab kya karein? Start with the mosquito

Aedes aegypti is the mosquito that matters here, and it has two habits that decide everything you should do. The first is where it breeds. It lays its eggs in clean, still water held in containers — not in gutters, not in nullahs, not in dirty standing water. The CDC describes the shortlist exactly: "These mosquitoes typically lay eggs in containers that hold water, like buckets, bowls, animal dishes, flowerpots, and vases." That means your cooler tray, the saucer under the tulsi pot, the rain collected in an old tyre, the drip tray behind the fridge, the bucket kept full during a supply cut.

The second habit is when it bites. The WHO is blunt about it: "The mosquitoes that spread dengue are active during the day." It bites people going about an ordinary day — a child in school, a man at his shop counter, a woman in the kitchen. The CDC adds that these mosquitoes "prefer to bite people, and live both indoors and outdoors near people", which is the most useful fact on this page: the mosquito biting your family almost certainly hatched in your building, your neighbour's balcony or the plot next door.

Why does dengue prevention in Indore start on your own balcony, not in the drain?

Prevention rearranges itself once those two habits are clear. Cleaning the drain outside is good civic practice, but it is not dengue prevention, because Aedes does not breed there. Shutting the windows at dusk misses the morning bite. The coil lit at bedtime is burning eight hours after the mosquito was active. The actual breeding site is usually inside the house or on its balcony, and it is nearly always something someone filled with water on purpose and then forgot.

When we ask a family with a dengue case what water is standing at home, the first answer is almost always "kuch nahi hai". The second answer, after a minute of thinking, is the cooler.

This is also why one careless flat affects a whole building. A single uncovered tank on one terrace, or one balcony full of pots in saucers, can supply mosquitoes for every floor beneath it. Dengue is one of the few illnesses where your risk genuinely depends on your neighbours, which is why it is worth raising in the RWA group rather than solving alone.

Aedes bites in daylight — so why does the night-time net miss the point?

Daylight is when this mosquito feeds, and that single fact undoes most household mosquito routines. Families buy nets and plug-in devices, use them faithfully from ten at night, and are then bewildered when someone gets dengue anyway. Protection has to move to the hours when the mosquito is actually active: covered arms and legs during the day, especially early morning and late afternoon; repellent on exposed skin before children leave for school, not at bedtime; and screens on the windows that stay open in the daytime.

Nets still matter, but for a different set of people. The WHO's own prevention list recommends "mosquito nets, ideally sprayed with insect repellent, if sleeping during the day" — which covers small children at their afternoon nap, elderly parents who rest after lunch, people on night shifts, and, most importantly, anyone in the house already ill with fever. A mosquito that bites a dengue patient can carry it to the rest of the family. If someone at home has fever, keeping them covered is not fussiness, it is how you stop the second case.

What is the weekly dry day, and exactly which containers should you check?

Weekly is the right interval because of the mosquito's own timetable: the CDC records that "A mosquito egg takes 7–10 days to develop into an adult mosquito". Break that cycle once a week and the population collapses. The WHO gives households the same instruction in its prevention advice — "cover, empty and clean domestic water storage containers on a weekly basis". Pick one fixed day. Sunday works, because everyone is home. On that day every container that holds water is emptied, scrubbed and dried before being refilled.

Scrubbing matters as much as emptying. The CDC notes that "Adult female mosquitoes lay eggs on the inner walls of containers with water, above the waterline", and that those eggs "can survive drying out for up to 8 months". A rinse leaves them; a brush removes them.

What to check, in the order we find them:

• Cooler trays and cooling pads. The commonest breeding site in an Indore home, and the one nobody counts as standing water.
• Plant saucers, money-plant bottles and vases. Change the water and rinse the container; do not just top it up.
• The terrace. Old tyres, broken buckets, paint tins, packing material, anything that collects rain.
• Overhead and underground tanks. The lid must sit flush; a gap the width of a finger is enough.
• Water stored during supply cuts. Drums, buckets and matkas kept full for the day the supply fails must be covered.
• The fridge drip tray and the AC drip tray. Both hold clean water for weeks unnoticed.
• Bathroom buckets, unused cisterns, pet bowls and bird baths.
• Construction pits and the abandoned corner of the parking area — the ones a building solves together or not at all.

"Hafte mein ek din, poora ghar — I ask every family to empty, scrub and dry each water-holding container on one fixed day, and to move sleeves and repellent to the daylight hours. Those two habits do more for dengue prevention than any fogging round." — Dr. Soumya S. Maurya, MBBS, MS (ENT)

Fogging, coils and repellents — what works and what does not?

Fogging is the most visible dengue measure and the most misunderstood. It kills adult mosquitoes flying at that moment, and the effect fades quickly. It does not reach the larvae sitting in the cooler tray upstairs. Two weeks later the same lane has mosquitoes again, and people conclude that dengue is unstoppable. Fogging has a place during an outbreak; it is simply not prevention.

What genuinely works, in order of how much it does: emptying and scrubbing containers weekly; covering every stored-water container; larvicide or the fish the municipal team introduce into tanks that cannot be emptied; window screens; repellents and covered arms and legs during daylight; and nets for daytime sleepers and anyone with fever.

What does very little: coils and vaporisers lit only at night, ultrasonic gadgets, camphor, and cleaning drains in the belief that this is where dengue comes from.

Children, older parents and the people who need most cover in Indore

Children get bitten when they are least protected — in the school ground in the morning and outside in the late afternoon. Full sleeves on school days and repellent on exposed skin before they leave does more than anything applied at bedtime. Fever in a child has its own rules, set out separately in what a fever in a small child actually needs.

Older parents are the other group we worry about, not because they are bitten more but because dengue is harder on a body already managing diabetes, blood pressure, kidney or heart disease. For them the difference between a manageable dengue and an admission is often simply how early it was recognised. The same is true in pregnancy.

Ghar pe abhi kya karein — what should you do at home right now?

If dengue is going around your area this week, start today: fix a weekly dry day, cover the cooler and every stored-water drum, and move protection to daytime with full sleeves, repellent and window screens. Put anyone with fever under a net, walk the terrace and parking area once, and learn the warning signs before anyone falls ill.

• Fix a weekly dry day and put it in the family group. Empty, scrub and dry every container. Hafte mein ek din, poora ghar.
• Cover the cooler and every stored-water drum today, rather than waiting for the chosen day.
• Move protection to daytime. Full sleeves, repellent on exposed skin in the morning and late afternoon, screens on the windows you keep open.
• Put anyone in the house with fever under a net, so the illness does not travel around the family.
• Walk the terrace and the parking area once, and take a photo of anything holding water to send to the RWA group. This is also the season for what waterlogged streets do to feet and skin, so wear closed footwear you can wash.
• Know the warning signs before anyone has a fever, not after.

Prevention plus early recognition — what we ask families in Indore to do

Here is the honest part. You can keep a perfect house, empty every container every Sunday, and still get dengue, because you were bitten at work, in a shop or on the school run. Prevention lowers your risk substantially. It does not remove it. That is not a reason to do less — it is a reason to pair it with the second half of the job, which is recognising dengue early and treating it correctly at home. Above all, paracetamol only, never ibuprofen or aspirin.

If someone in the house does get a fever this week, our companion piece on telling ordinary viral fever from dengue sets out the pattern, the days that matter and the signs that mean come in immediately.

If you are unsure about a fever at home, or you want an examination rather than a phone opinion, we see patients Monday to Saturday, 6 to 8 PM. You can message the clinic on WhatsApp, call 7869709075 for an evening slot, or find timings and directions on drhealthcare.in.

Questions patients ask us