Health in the Rainy Season: How to Prevent Malaria and Waterborne Diseases

Once the rains settle in Calabar, everything changes. Gutters fill, small puddles sit for days, and mosquitoes multiply fast. At the same time, floods and run-off can contaminate wells, boreholes, and stored water. That is why the wet months usually come with two familiar problems, malaria and waterborne diseases like diarrhoea, typhoid and cholera.

Nigeria still carries a heavy malaria burden, and national reports continue to show high case numbers year to year. In 2025, media reports cited tens of millions of malaria cases recorded within the year, a reminder that prevention matters in every household, not just during outbreaks (Guardian Nigeria report on 2025 malaria cases). In Cross River, the state has also been pushing malaria work through programmes expanded to all wards, including the IMPACT project focus on coverage and services (Cross River State update on IMPACT expansion).

Part 1: Preventing malaria during Calabar’s rainy season

Why malaria risk rises when it rains

Mosquitoes that spread malaria breed in still water. Rain creates new breeding sites around homes, from open drums to blocked drains and potholes. In many Calabar neighbourhoods, when gutters overflow and refuse blocks water flow, the street itself becomes a breeding area.

The most important thing to remember is simple: you prevent malaria by preventing mosquito bites, and by treating fever quickly with a test-backed diagnosis. The World Health Organization’s malaria guidance is clear on prevention tools like insecticide-treated nets and timely diagnosis and treatment (WHO malaria guidelines).

Sleep under a treated net, every night

Long-lasting insecticidal nets (LLINs) are still one of the strongest protections for families. In Calabar, people often stop using nets when nights feel hot, but rainy season is when you need them most.

Hang the net so it does not touch your skin when you sleep, mosquitoes can bite through the net if it presses on your arm or leg.
Tuck the net under the mattress or sleeping mat fully, even if it means rearranging the bed.
Fix small holes immediately with needle and thread. Do not wait for “next week”.
Do not wash treated nets every time. Wash only when truly dirty, and dry in shade, not under harsh sun, so the insecticide lasts longer.

If your net is badly torn or missing, ask at your nearest primary health centre about distribution campaigns or replacement options. National malaria prevention is coordinated through Nigeria’s malaria programme (National Malaria Elimination Programme (NMEP)), and state campaigns often tie into that structure.

Make your compound harder for mosquitoes

Even with nets, the environment around your home matters. Many mosquito breeding points in Calabar are not “big water”, they are small containers and blocked drainage.

Empty and turn over buckets, basins, wheelbarrows, old tyres, and broken plastics that hold water after rain.
Cover water storage drums and tanks tightly. A loose lid is not enough.
Clear gutters and drain lines, especially before heavy rain days. If water must pass, give it a clear path.
Fill potholes and depressions inside the compound with laterite or gravel where possible.
Cut back thick vegetation close to windows and doors, it gives mosquitoes resting spots.

For areas with frequent flooding, plan ahead. Keep sandbags where needed, and make a habit of pushing standing water away from doorways after heavy rain.

Protect yourself in the evenings

Mosquito bites are common from dusk to dawn. If you are outdoors at night, add extra protection.

Wear long sleeves and trousers when you can, especially for children playing outside in the evening.
Use an insect repellent approved for skin use, and follow the label instructions.
Use window screens if available, and keep doors closed early in the evening.
If you use coils, place them safely away from children and avoid sleeping in a closed room full of coil smoke.

Who should take malaria prevention most seriously

Everyone in Calabar should take malaria prevention seriously, but these groups need extra attention:

Pregnant women, because malaria can lead to anaemia and pregnancy complications. Antenatal clinics also provide preventive guidance.
Children under 5, because malaria can worsen quickly in small children.
People with chronic illness, especially those already dealing with anaemia or weakened immunity.

Fever is not “just malaria”, test early

During rainy season, many people treat fever at home and delay testing. That delay can be dangerous, and it also hides other illnesses that look like malaria at first.

If fever lasts more than 24 hours, or comes with vomiting, weakness, confusion, or difficulty breathing, go for a malaria test quickly.
Do not rely only on “anti-malaria” drugs bought over the counter without a test. Wrong treatment wastes time and money.
If a child cannot drink, is unusually sleepy, or has convulsions, treat it as an emergency and go to a hospital immediately.

Rainy-season malaria checklist (quick home audit)

What to check	What “good” looks like
Nets on beds	Every sleeping space has a hanging LLIN, tucked in nightly, with no big tears
Water containers	All drums and buckets are covered, and no open containers sit outside after rain
Drainage around the house	Gutters and drain paths are clear, no stagnant pools near doorways
Evening exposure	Family uses long clothing or repellent when outdoors at night
Plan for fever	Family knows the nearest clinic, and agrees to test early instead of guessing

Why dirty water becomes a rainy-season health problem

When drains overflow or floodwater enters compounds, it carries sewage, animal waste, and dirt into places it should never reach. After that, the same water can end up in wells, on cooking surfaces, and on children’s hands. This is how diarrhoea outbreaks start in the wet months, especially in crowded areas and places where toilets and waste disposal are already under pressure.

The next part of this guide focuses on practical steps Calabar residents can use to keep drinking water safe, maintain hygiene when the streets are messy, and know when to seek medical help for suspected waterborne infection.

Part 2: Preventing waterborne diseases when everywhere is wet

Know the common rainy-season culprits

In Calabar, the rainy-season stomach problems people call “running stomach” are often caused by germs from faecal contamination. They spread through unsafe water, dirty hands, and food that gets exposed to floodwater, flies, or unclean surfaces. Typhoid-like illness is also common after weeks of poor water hygiene, and cholera can spread fast when sanitation breaks down.

Flooding makes this worse. WHO has warned in different flood responses across Africa that early preparedness around safe water and hygiene protects families when waters rise (WHO AFRO flood preparedness story).

Safe drinking water: what to do in real Calabar conditions

Different households rely on different sources, pipe-borne water, boreholes, wells, rainwater, and sachet water. None is automatically “safe” during heavy rains. Use a simple rule: if you are not sure, treat it.

Option A: Boiling (best for most homes)

Bring water to a rolling boil.
Keep it boiling for at least 1 minute.
Allow it to cool in a clean, covered container. Do not leave it open on the table.

Boiling kills germs, but it does not remove dirt. If the water is cloudy, let it settle and pour the clearer part off, or filter through a clean cloth before boiling.

Option B: Chlorine (when you cannot boil)

Use only proper water-guard products or household bleach that is plain and unscented. Follow the label instructions. If you are using household bleach and you are not sure of the strength, ask a pharmacist for guidance. After adding chlorine, mix and wait 30 minutes before drinking. The water should smell lightly of chlorine. If it smells too strong, leave it uncovered for a short time and allow some odour to reduce.

Option C: Water purification tablets or filters

Tablets are useful during travel, floods, or when fuel is scarce. Ask at pharmacies and major chemist shops in Calabar. Filters can work well, but only if the filter is maintained and the cartridges are changed when due. A dirty filter can become its own problem.

How to store water so it stays safe

Many families treat water correctly, then contaminate it again by the way it is stored. During rainy season, treat storage like food safety.

Use containers with tight lids. Do not store drinking water in open buckets.
Wash storage containers weekly with soap and safe water. Rinse well.
Do not dip cups or hands into the container. Pour water out, or use a clean tap dispenser.
Keep drinking water separate from water used for bathing or washing plates.

Borehole and well water: signs of trouble after heavy rain

If your borehole or well is close to a soakaway, pit toilet, or flood channel, it is more likely to get contaminated when the ground is saturated. Treat the water immediately after major rainfall if any of these show up:

Cloudy or muddy appearance
Unusual smell
Change in taste
More people in the house developing stomach upset within a short time

If you can afford basic testing, ask for simple water tests at credible labs, or buy basic test strips from a pharmacy. When in doubt, boil.

Sachet water: what to check before you buy

Sachet water is popular in Calabar, but quality varies. During the rains, packs can also be stored in dirty places where floodwater splashes around.

Check for a clear NAFDAC number and producer address on the pack.
Avoid sachets with weak seals, leaks, or unusual smell.
Buy from places that keep sachets off the ground and away from drains.
If the water tastes odd, do not “manage” it. Throw it away.

Food hygiene: what changes in the wet months

Humidity rises, flies increase, and surfaces stay wet. That is a perfect setup for germs to spread. This affects both home cooking and street food.

Situation	What to do
Cooked food sitting for hours	Eat hot food hot. Reheat leftovers until steaming before eating.
Raw and cooked foods mixing	Use separate plates and knives for raw meat/fish and ready-to-eat food.
Vegetables and fruits from the market	Wash with safe water. For leafy veg, rinse several times. Peel fruits when possible.
Street food during heavy rains	Buy from vendors with covered food, clean serving utensils, and a clear handwashing setup.

When markets flood, be extra careful with ready-to-eat items. In places like Watt and Marian markets, water can move quickly through the walkways after strong rain. If food is exposed, assume splash contamination is possible.

Hygiene that actually prevents infection

Handwashing matters, but it must be done properly and consistently.

Wash with soap and safe water after toilet use, after cleaning a child, before cooking, and before eating.
Keep nails short for children. Germs hide under nails.
Clean kitchen cloths daily. Wet cloths left in the kitchen are a breeding ground for germs.
Disinfect high-touch surfaces when someone in the house has diarrhoea or vomiting.

If you have limited water, use a small “tippy tap” style handwashing setup outside, a container with a small hole and a bar of soap beside it. The point is to make handwashing easy, not a struggle.

What to do immediately after flooding enters your compound

Keep children out of floodwater. Small cuts on the skin become entry points for infection.
Throw away food that had contact with floodwater, including items in damaged sachets and wet cartons.
Wash plates, pots, and cooking surfaces with soap and safe water, then rinse with boiled or treated water if possible.
Clean and disinfect toilets and bathroom floors, especially if sewage backed up.
Treat all drinking water for at least the next few days, even if it looks clear.

Diarrhoea danger signs, especially for children

Waterborne diseases become deadly when dehydration sets in. Do not wait at home if you see danger signs.

Very little or no urine
Sunken eyes, dry mouth, no tears when crying
Child is unusually weak, sleepy, or not responding well
Repeated vomiting, cannot keep fluids down
Blood in stool

Start oral rehydration solution (ORS) immediately if available, and go to a clinic. If you do not have ORS yet, give clean fluids while you arrange care. ORS is still one of the cheapest life-savers in rainy season.

When to go to the clinic for suspected typhoid or cholera

Not every fever is malaria, and not every stomach upset is “something I ate”. Seek medical attention when:

Diarrhoea lasts more than 24 hours, or the person looks dehydrated
High fever persists even after a malaria test is negative
There is severe abdominal pain, confusion, or weakness
Several people in the same house develop diarrhoea around the same time

Testing matters here too. Avoid self-medicating with antibiotics because it can make future infections harder to treat.

Community action that reduces disease for everyone

During the rains, one blocked drain can affect a whole street. If your area has regular clean-up days, take them seriously. Where there is no structure, neighbours can still agree on small, regular actions.

Weekly gutter and drain clearing on your street, especially before forecast heavy rain
Proper bagging of refuse so rainwater does not spread it around
Closing open defecation points near waterways and footpaths
Reporting overflowing refuse dumps and blocked culverts early, not when the water is already inside homes

Quick combined checklist for rainy-season health

Area	Do this weekly
Malaria prevention	Inspect nets, repair holes, clear standing water, cover drums, plan for fever testing
Water safety	Boil or chlorinate drinking water, wash storage containers, keep lids tight
Food and hygiene	Reheat leftovers, keep food covered, wash hands with soap, clean wet cloths daily
After flooding	Disinfect surfaces, discard contaminated food, treat all water for several days

The rainy season does not have to mean months of constant malaria and stomach sickness. Small habits done consistently, sleeping under a good net, treating drinking water, washing hands properly, and acting quickly when symptoms start, will protect most families.

For more locally useful guides like this, keep MyCalabar close. We will keep tracking Cross River health updates, seasonal risks, and what residents can do, street by street, to stay well through the rains.

How much more prevalent are malaria and waterborne diseases specifically in Calabar during the rainy season compared to the dry season?

Malaria and waterborne disease risk in Calabar spikes during the rainy season (May–Oct) from stagnant water; floods link higher malaria risk vs dry season.

Beyond general awareness, what are the most common misconceptions Calabar residents still hold about malaria transmission and prevention?

Many still think malaria is seasonal, bites indoors only, nets fix all, or herbs cure. They delay diagnosis, mix fever with malaria, and assume kids aren’t at risk.

Are the mosquito nets provided by local health campaigns truly effective against the types of mosquitoes prevalent in Calabar, and how often should they be replaced?

LLINs stay effective mainly for 3–4 years in Calabar; replace every 3–5 years or sooner if torn or insecticide wanes, since Anopheles and Aedes are common.

Where can Calabar families access affordable or free new insecticide-treated mosquito nets if their existing ones are damaged or old?

Calabar families can get free LLINs at local PHC centers run by PHCDA and the Cross River State Ministry of Health, plus during NMEP mass campaigns at community health sites.

What are the specific, easy-to-implement steps Calabar residents can take around their homes to eliminate mosquito breeding sites, particularly concerning our local drainage systems?

Clear blocked drains weekly, drain standing water from yards, cover gutters, seal leaks, fill potholes, and report flood-prone sites to Calabar environmental office.

For those relying on pipe-borne water in Calabar, what reassurances or specific purification methods are needed during the heavy rains to ensure it’s safe for consumption?

Boil pipe water for 3 minutes during heavy rains or treat with 2 drops of 5% household bleach per litre, wait 30 minutes; keep containers clean and allow first flush/debris to settle or be filtered.

Many households use borehole water; what are the immediate signs of contamination after heavy rainfall, and what affordable tests can we perform locally?

Post rain boreholes can show cloudy water, color shifts, odd smell or taste, or stomach upsets; test with home kits: chlorine residual, pH strips, nitrate/nitrite, turbidity, and coliform tests.

Is sachet water consistently safe across all brands sold in Calabar, and how can we identify reputable sources versus potentially unhygienic ones?

Sachets vary; buy only NAFDAC-registered brands from licensed outlets, inspect seal, expiry, batch code, and producer address; report fakes to NAFDAC.

What are the most critical food hygiene practices Calabar households must strictly adhere to, especially for street food vendors, given the increased humidity and potential for contamination?

Keep hands clean with soap and safe water, cover and seal ready foods, separate raw from cooked, reheat to steaming hot, use clean utensils and surfaces, proper waste disposal, and vendor training.

Beyond handwashing, what are other essential personal hygiene habits Calabar residents should adopt to prevent the spread of waterborne diseases during this season?

Beyond handwashing, store water in clean containers, boil or chlorinate drinking water, cook food thoroughly, keep toilets clean and waste disposed safely, and dry clothes in sun.

How accessible and affordable are water purification tablets or filters in Calabar, and are they a recommended alternative for treating water at home?

Calabar has Aquatabs and Oasis style tablets sold by local pharmacies and online Nigerians shops; a bottle of 50–100 tablets runs roughly ₦2,000–₦5,000, handy for households and emergencies, but household water filters offer easier long‑term use.

What specific community-led sanitation efforts (e.g., gutter cleaning, waste disposal drives) are most impactful in Calabar for reducing disease vectors during the rains?

Gutter cleaning and drain desilting; weekly community waste drives; market sanitation committees; open defecation reduction. These cut vector breeding in the rains.

Are Calabar’s public health centers and hospitals adequately stocked with anti-malarial drugs and rehydration salts to cope with the anticipated increase in cases?

Calabar clinics have a Primary Health Care Drug Fund and malaria drug budgets, but real stockouts and rising costs persist into 2025–26.

What are the earliest and most common symptoms of malaria that often get mistaken for other ailments in children and adults in Calabar?

Malaria starts with fever and chills, plus headache, muscle pains and fatigue; kids may show poor feeding and vomiting, while adults feel body aches and weakness.

For pregnant women in Calabar, what are the specific malaria prevention and treatment guidelines they should follow, and where can they get specialized care?

Calabar pregnant women should get IPTp-SP (3+ doses after quickening), sleep under ITNs, test promptly, and use ACTs only under supervision. Seek care at UCTH, Calabar Teaching Hospital, or CRS Specialist Hospital.

What are the unique challenges faced by residents in Calabar’s flood-prone areas (e.g., Efiote, Parliamentary Extension) regarding disease prevention, and what immediate post-flood measures should they take?

Calabar flood zones like Efiote face water contamination, stagnant pools, mosquitoes, displacement and poor sanitation, raising cholera and malaria risks. Post flood: boil or treat water, wash hands, safe food, vaccinate where possible, clean drains and seek care for fever or severe symptoms.

How can local schools and daycare centers in Calabar better enforce hygiene standards and educate children on disease prevention during the rainy season?

Calabar schools boost rainy season hygiene: install handwashing stations, ensure clean water, daily classroom disinfection, teach simple hygiene, involve parents, and mosquito control.

What steps is the Calabar municipal government specifically taking this rainy season to improve drainage, waste management, and public health awareness?

Calabar Municipality desilts drainages, ramps up waste evacuation, and runs public health campaigns this rainy season with stricter waste rules and ongoing sanitation drives.

What are the common reasons why some Calabar residents still resist using mosquito nets or boiling water, and how can these concerns be addressed culturally?

Heat makes nets uncomfortable, some distrust ITNs, nets wear out, myths say boiling water is enough; fix via local leaders, Efik language demos, repairs and hands-on net hanging sessions.

Are there specific local markets or food preparation areas in Calabar that are particularly susceptible to contamination during the rains, and what precautions should buyers take?

Marian and Watt markets in Calabar flood with grime during heavy rains; buyers should cover foods, rely on vendors with clean water, wash produce, and avoid exposed ready-to-eat items.

What are the financial costs associated with treating a typical case of malaria or a severe waterborne illness for an average Calabar family, and are there social welfare programs available?

Calabar malaria costs: public ₦1,200–2,500; severe private ₦5,000–8,000; waterborne cases ₦4,000–12,000. Welfare: NHIA SSHIA, NSIPA cash transfers, NCTO, Cross River IMPACT malaria program.

How can communities in Calabar report neglected drainage systems or overflowing refuse dumps that contribute to disease spread, and what is the expected response time?

Calabar residents report blocked drains or overflowing dumps to CRS Environmental Sanitation via the state portal or their LGA, with field teams prioritizing hotspots; urgent reports get faster attention, typical 24–72 hours.

What are the trusted local health hotlines or emergency contacts that every Calabar resident should have readily available during this period for urgent medical advice?

Dial 112 for nationwide urgent care, 199 for police. Cross River is rolling out NEMSAS and PHEOC ambulance access; keep local hospital emergency lines and 112 handy.

Beyond conventional medicine, are there traditional Calabar remedies for malaria or waterborne symptoms that are scientifically proven to be safe and effective, or should they be avoided?

Most Calabar plant remedies lack rigorous malaria or waterborne illness tests; some can be unsafe or interact with meds, so use proven medicines and clean water; seek local clinic if unsure.

Looking forward, what long-term infrastructure improvements or public health policies does Calabar need to implement to reduce the perennial threat of these diseases during future rainy seasons?

Expand durable drainage, flood zoning, and waste/sewage upgrades; ensure reliable piped water, vector control, and climate-resilient, stockpiled public health facilities for rainy seasons.