October can bring another spell of rain in many parts of the world. While the showers may bring relief from the heat, rainwater collecting around homes can create favourable breeding sites for Aedes mosquitoes, the main mosquitoes responsible for spreading dengue.

The risk is not simply because it is raining. The bigger concern is water that remains collected in containers, coolers, plant trays, tyres, rooftops, drains and other places where mosquitoes can lay eggs.

India’s National Centre for Vector Borne Diseases Control (NCVBDC) recommends removing mosquito breeding sources, keeping stored water covered and following a weekly “dry day” routine. The World Health Organization (WHO) also recommends regularly emptying and cleaning water containers and removing artificial habitats that can hold water.

Here are practical steps families can take during the October rainy season to reduce the risk of dengue.

Why October Rain Can Increase Dengue Risk

Dengue is caused by the dengue virus and is transmitted mainly through the bite of infected Aedes mosquitoes.

Aedes mosquitoes can breed in surprisingly small amounts of stagnant water. According to NCVBDC, common breeding places include coolers, drums, buckets, flower vases, plant saucers, tanks, bottles, discarded tyres, roof gutters and other containers where rainwater can collect.

Rainfall can therefore create new breeding opportunities around homes. India’s dengue-control guidelines also note that temperature and rainfall influence mosquito breeding and that transmission risk can be greater during rainy periods.

The good news is that many of these breeding sites can be eliminated with simple household measures.

1. Check Your Home for Standing Water Every Week

One of the most important dengue-prevention habits is a weekly inspection of your home and surroundings.

Do not only look for large pools of water. Aedes mosquitoes can use small containers that hold relatively little water.

Check:

• Flower pots and plant saucers
• Buckets and tubs
• Water coolers
• Old tyres
• Plastic containers
• Bottles and cans
• Roof gutters
• Drains
• Birdbaths
• Construction materials
• Children’s outdoor toys
• Water storage containers
• Any object left outside after rainfall

Empty, clean, cover, turn over or discard items that can collect water.

The CDC recommends checking water-holding items at least once a week and emptying and scrubbing them to remove mosquito eggs and larvae.

2. Follow a Weekly “Dry Day” at Home

A simple weekly routine can make mosquito control easier.

Choose one day every week when the entire family checks the house, balcony, terrace, garden and surrounding area for water accumulation.

Empty water from coolers, plant trays, buckets and other containers. Clean them properly before filling them again.

NCVBDC specifically recommends removing water from coolers and small containers at least once a week and promotes weekly source reduction as an important dengue-control measure.

Do not wait until you see mosquitoes. The aim is to eliminate their breeding places before mosquito populations increase.

3. Take Extra Care With Water Coolers

Water coolers can become an important mosquito breeding site if they are not cleaned regularly.

If a cooler is being used:

• Empty and clean it regularly.
• Do not allow water to remain undisturbed for long periods.
• Check hidden areas where water may collect.
• Clean the cooler before refilling it.
• Keep unused coolers completely dry.

NCVBDC specifically identifies desert coolers among the common breeding places of Aedes mosquitoes.

4. Keep Water Storage Containers Covered

Many Indian households store water in drums, buckets, tanks and other containers.

These containers should remain properly covered so mosquitoes cannot enter and lay eggs.

If a container cannot be completely covered, appropriate mosquito-proof screening can help prevent mosquitoes from accessing the water. The CDC recommends tightly covering water storage containers and using suitable mesh where a lid is not possible.

Do not leave buckets or drums uncovered after filling them.

5. Don’t Ignore Your Balcony, Terrace and Rooftop

People often inspect their rooms but forget outdoor areas.

After rain, water can remain trapped on rooftops, balconies, terraces and in small objects that are rarely moved.

Check:

• Roof corners
• Drain outlets
• Plant pots
• Plant trays
• Pipes
• Discarded containers
• Tarpaulins
• Old furniture
• Plastic sheets
• Water tanks
• Gutters

NCVBDC’s vector-control guidance specifically recommends management of rooftops, porticos and sunshades as part of environmental mosquito control.

6. Protect Children From Mosquito Bites

Children can spend considerable time outdoors, particularly when the weather becomes cooler after the rain.

Parents should encourage children to wear clothing that covers their arms and legs when appropriate and use a suitable mosquito repellent according to its label.

NCVBDC recommends full-sleeved clothing and mosquito repellents as personal protection measures.

Parents should also remember that Aedes mosquitoes are primarily active during the daytime. Therefore, dengue prevention should not be limited to nighttime mosquito protection.

7. Use Mosquito Repellent Properly

Mosquito repellent can provide an additional layer of protection when used correctly.

WHO recommends repellents containing ingredients such as DEET, picaridin or IR3535. Follow the product label carefully, particularly when applying repellent to children.

Do not assume that mosquitoes only bite in the evening. Aedes mosquitoes are active during the day, making daytime protection particularly important.

8. Wear Clothes That Reduce Exposed Skin

When mosquitoes are active, clothing can provide a physical barrier.

Loose-fitting, long-sleeved shirts and long trousers can reduce exposed skin. This is particularl