Example Case: Ten Days in the Water at Soi Maliland, Khlong 11, 2026

Note: this is an illustrative example case based on common post-flood situations, not the account of any specific person.

Tom lives on Soi Maliland beside Khlong 11 in Nong Sam Wang. Water entered the soi in late September 2026 and refused to go down. Every day Tom waded through knee-to-waist-deep water to collect donations and buy food, and helped neighbours carry belongings to higher ground. He wore shorts and sandals because they were convenient. His shins were scratched by debris under the water, and he often had to pull leeches off his legs.

About a week later he suddenly developed a high fever, chills, a severe headache and pain in both calves so bad he could barely walk. His eyes turned red as if he had not slept. He assumed it was a cold from being in the water and rested at home for two days, until his wife noticed he was passing less urine and his eyes were turning yellow. She took him straight to hospital.

This is why health officials repeat the same message in every flood: if you get a fever after wading, do not wait for it to pass, and tell the doctor you waded. Leptospirosis caught early has a very good chance of full recovery, but left too long it can affect the kidneys and liver. At the same time, not every post-flood fever is leptospirosis, so knowing the possible germs helps families watch for the right signs.

The Soi Maliland, Nong Suea, Pathum Thani Flood of 2026 (B.E. 2569): What the News Reported

Khaosod reported on 5 October 2026 (B.E. 2569) that in Soi Maliland, Khlong 11, Nong Sam Wang subdistrict, Nong Suea district, Pathum Thani:

• Flooding began on 25 to 26 September 2026 and had lasted more than 10 days.
• About 134 residents were still in the affected area.
• The water had started to rot, and leeches were abundant.
• The water came from Ongkharak district, Nakhon Nayok, overflowing the Khlong 14 irrigation canal.
• Pumping had lowered the water by about 30%, with a clear drop expected within 2 days.

Nationally, the Department of Disaster Prevention and Mitigation reported, as of 06:00 on 7 October 2026 via the Government Public Relations Department, that floods affected 27 provinces plus Bangkok, 123 districts, 984 subdistricts and 1,154,875 households, with more than 3.1 million people affected.

Soi Maliland shows almost every risk factor for post-flood fever: people wading daily for long periods, stagnant rotting water carrying animal urine and sewage, leech bites leaving many small wounds on the legs, skin softened by long soaking that lets germs in easily, and rats escaping the water to share homes and high ground with people.

What Germs Cause High Fever and Calf Pain After Wading?

Fever is the body's response to infection. Muscle pain can come from germs invading muscle directly, from body-wide inflammation, or from an infected wound on the leg. Here are the key germs, starting with the one to think of first.

1. Leptospira (Leptospira interrogans), the cause of leptospirosis

What it is: a spiral-shaped bacterium that lives in the kidneys of rats and other animals such as dogs, cattle, buffalo and pigs, and is shed in their urine. It can survive for weeks in standing water and wet mud.

How it spreads: through cuts, scrapes, leech bites, water-softened skin and the lining of the eyes, nose and mouth. Long wading without boots or accidentally swallowing floodwater greatly increases risk. It generally does not spread from person to person.

Incubation: about 2 to 30 days, usually 5 to 14, so symptoms may start after the water has gone.

Symptoms: sudden high fever, chills, severe headache, intense muscle pain especially in the calves and thighs, red eyes without discharge, nausea and vomiting, sometimes a rash. Severe cases may bring yellow skin and eyes, reduced urine, coughing blood or breathlessness, which are emergencies.

Who is at risk: people who wade or work in water for long periods, farmers, rescue volunteers, waste collectors, and anyone with wounds on the feet and legs.

Key point: diagnosed and treated early, most people recover well. Fever within about a month of wading means seeing a doctor and mentioning floodwater. Do not self-medicate and wait.

2. Burkholderia pseudomallei, the cause of melioidosis

Found in soil and surface water in many parts of Thailand, most commonly the Northeast but also elsewhere. It enters through wounds in contact with mud, by inhaling water droplets or soil dust, or through unsafe drinking water. Illness ranges from persistent high fever, cough and pneumonia to abscesses in various organs and bloodstream infection. People with diabetes, kidney disease or heavy alcohol use are at high risk. Boots and gloves when shovelling mud cut the risk considerably; diabetics with fever after a flood should tell the doctor about mud exposure.

3. Dengue virus

Spread by Aedes mosquitoes that lay eggs in fairly clean standing water in containers such as tyres, pots, bottles, buckets and floating debris. After floods, countless water-filled containers around homes become breeding sites. Dengue causes high fever, headache, pain behind the eyes, muscle and joint pain and sometimes small red spots. The period when the fever starts to fall is the most critical. Drowsiness, severe abdominal pain, repeated vomiting, unusual bleeding or cold hands and feet need hospital care at once.

4. Chikungunya virus

Also spread by Aedes mosquitoes, causing sudden high fever, rash and severe joint pain, especially in the wrists, ankles and fingers, which may last weeks or months. Removing standing water from containers is the main prevention for both mosquito-borne diseases.

5. Orientia tsutsugamushi, the cause of scrub typhus

Transmitted by the bite of chigger mite larvae living in grass, scrub and places where rodents live. During floods people often move onto embankments, roadsides or overgrown high ground, raising the chance of bites. Symptoms include high fever, headache, muscle pain, red eyes and sometimes a black, cigarette-burn-like scab (eschar) at the bite site, often in the groin, armpit or waistband, an important clue to show the doctor.

6. Rickettsia typhi, the cause of murine typhus

Spread by rat fleas. When rats move into homes and shelters to escape the water, their fleas come too. Symptoms are fever, headache, muscle pain and sometimes a rash, easily confused with flu or early leptospirosis. Rodent control and clean living areas matter.

7. Salmonella Typhi, the cause of typhoid fever

Spread through water and food contaminated by the stool of infected people. Its hallmark is a fever that climbs day by day and lasts more than a week, with headache, weakness, stomach pain, poor appetite and constipation or diarrhea. Boiled water and freshly cooked food prevent it.

8. Influenza virus in shelters

When many people share shelters or relatives' homes, flu spreads through coughs, sneezes and hands on shared surfaces. It causes sudden high fever, aches all over, headache, cough and sore throat. The muscle aches can be confused with leptospirosis, so anyone who waded should always tell the doctor. Influenza H1N1 is one of the organisms named in WHD's service information.

9. Streptococcus pyogenes and Staphylococcus aureus: infected leg wounds

Sometimes fever and calf pain come not from a body-wide illness but from a leg wound that has turned into cellulitis, an infection of the skin and tissue beneath it that becomes swollen, red, hot and painful. Small wounds from leech bites, wood splinters, nails or scratching that soak in dirty water let these skin bacteria in. Redness spreading quickly, pain out of proportion to the wound, or fever means seeing a doctor now.

10. Aeromonas hydrophila, a freshwater germ

Lives in canals, ponds and long-standing fresh water and can infect wounds exposed to it, sometimes causing rapid swelling and redness with fever. In water that has stood for more than 10 days and started to rot, as at Soi Maliland, anyone with leg wounds should avoid wading, or cover wounds with waterproof dressings and wear boots.

Calf pain that is not an infection: days of wading and lifting can leave muscles tired and sore. But pain in one calf with swelling, redness and warmth, especially in older adults or people who sat or lay still for long periods during the flood, may be a blood clot in a leg vein, which also needs a doctor straight away.

Fever After Wading: When Should You See a Doctor?

The single most important advice here: if you develop a fever within about a month of wading through floodwater, see a doctor and say that you waded. See a doctor immediately if:

• Sudden high fever with severe calf or muscle pain.
• Red eyes without discharge, together with fever.
• Yellow skin or eyes, or very dark urine.
• Clearly reduced urine, or none for several hours.
• Coughing blood, breathlessness or chest pain.
• Bleeding spots, nosebleeds, bleeding gums or vomiting blood.
• Fever falling but the person becomes drowsy, has severe stomach pain or cold hands and feet (dengue warning signs).
• Severe headache, stiff neck, confusion or seizures.
• A leg wound with fast-spreading redness, pus or fever.
• One swollen, red, warm, painful calf.
• People with diabetes or kidney disease, older adults, pregnant women and young children with fever after a flood should be seen sooner.

Tell the doctor: when you started wading and for how long, any wounds or leech bites, whether you saw rats at home, whether you stayed in grassy areas, and any chronic illness. This helps separate leptospirosis, dengue, scrub typhus and other causes faster.

On the way to care, rest, drink enough clean water and sponge with room-temperature water. Do not buy medicine without asking a doctor or pharmacist: some fever medicines are unsuitable if dengue is possible, and self-treatment can mask symptoms. If floodwater makes travel hard, call 1669 or ask village health volunteers and local authorities for help. The Department of Disease Control hotline is 1422.

Leech Bites and Leg Wounds: Simple Care

1. Do not yank a leech off; slide a fingernail or card under the mouth end to release it.
2. Wash the bite with soap and clean water and pat dry.
3. Press with a clean cloth if it keeps bleeding.
4. Cover with a clean plaster and avoid wading until it heals.
5. See a doctor if redness spreads, pus forms or fever starts.
6. For deep wounds from sharp debris, ask a doctor about tetanus vaccination.

When rat droppings or urine marks are found at home, do not dry-sweep or vacuum. Wear gloves and a mask, wet the area with cleaning solution first, then wipe up and seal in a bag. Rats and their traces tend to be in kitchens, food cupboards, storerooms, under stairs, near bins and around old wet sandbags.

How to Prevent Leptospirosis and Fever After a Flood: 12 Steps

1. Avoid wading when you can, especially in stagnant, rotting water.
2. Wear rubber boots and long trousers in water and gloves for mud.
3. Cover leg and foot wounds with waterproof dressings first.
4. Wash feet and legs with soap and dry them after every wade.
5. Keep floodwater out of your mouth, eyes and nose; keep children out of it.
6. Drink boiled or bottled water and eat freshly cooked food.
7. Store food in lidded containers and remove rubbish to deter rats.
8. Wet rat traces before wiping; never dry-sweep.
9. Empty water from containers weekly and sleep under a net.
10. Wear long sleeves and avoid sitting in grass on embankments to reduce scrub typhus.
11. Wash wading clothes and boots separately.
12. Clean, then disinfect flooded surfaces, kitchens, bathrooms and rat areas, as WHO and CDC advise.

Why Cleaning Alone May Not Be Enough After a 10-Day Flood

Long-standing, rotting water leaves mud deeper in tile grout, wood and lower walls than a short flood, and rats leave traces in many spots. Washing with water and detergent is essential, but corners are hard to reach, early tap water may not be clean, mixing chemicals risks toxic fumes, and anyone recovering from a fever should not do heavy cleaning. CDC and WHO advise: remove mud and debris, wash with clean water and detergent, dry, then disinfect surfaces. Professional spraying completes that final step across the house.

WHD Disinfection Spraying After the Nong Suea, Pathum Thani Flood of 2026

World Health Disinfection (WHD) provides disinfection spraying for homes, buildings and businesses. According to the service information, trained technicians spray and/or fog using ULV (Ultra Low Volume) equipment, with CHEMGENE HLD4H, a medical-grade UK disinfectant containing Benzalkonium Chloride and Didecyldimethylammonium Chloride. It is stated to cover viruses, bacteria and fungi, naming COVID-19, RSV, H1N1, H5N1 and hand-foot-mouth virus, with 99.99% efficacy; the product information also lists Salmonella and bacteria in general. The website shows references from the Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019.

Being straight about each germ: Leptospira, Burkholderia, Streptococcus, Staphylococcus and Aeromonas are not on WHD's published list, so we do not claim test results for them. They belong to the bacteria group the product says it covers, and WHO and CDC advise cleaning then disinfecting flood-contaminated surfaces. Ask WHD for test data on a specific organism. Dengue, chikungunya, scrub typhus and murine typhus spread through mosquitoes, mites and fleas; a disinfectant is not an insecticide. Their prevention means removing standing water, using nets and controlling rats.

The WHD process

1. Survey: send photos or video on LINE, including any rat traces.
2. Mud removal and washing first.
3. Zoning: plan rooms; store food, dishes and personal items.
4. Spraying: technicians in protective gear treat floors, flooded lower walls, kitchens, bathrooms, storerooms and touch points. No people or pets in the zone during application.
5. Re-entry: per the service information, about 30 minutes, following the technician's instructions.

We do not claim there is no residue; ventilate and rinse food containers afterwards. Per the website promotion, customers receive a CHEMGENE spray and WELLGIENIC wet wipes, and tax invoices are available. Prices depend on area and conditions. WHD is based in Bang Khae, Bangkok, with no branch in Pathum Thani; jobs are booked by phone and LINE.

10 Reasons to Disinfect After a Long-Standing Flood

1. Finish the job after mud removal.
2. Treat areas where rats lived.
3. Reduce contact with contaminated surfaces for people with hand or foot wounds.
4. Cleaner kitchens and bathrooms.
5. ULV mist reaches hidden gaps.
6. People recovering from illness avoid heavy cleaning.
7. Medical-grade CHEMGENE HLD4H.
8. No risky home mixing of chemicals.
9. Trained technicians in protective gear.
10. Quick re-entry; see the service page.

Frequently Asked Questions About Fever and Calf Pain After a Flood

High fever and calf pain after wading: is it leptospirosis?

It fits leptospirosis well, but a doctor must confirm it, because dengue, scrub typhus, flu and infected leg wounds can look similar. Go now and mention the wading.

What are the symptoms of leptospirosis?

Sudden high fever, chills, headache, muscle pain especially in the calves, red eyes, nausea; in severe cases yellow skin, less urine, coughing blood or breathlessness.

How many days after wading does leptospirosis appear?

About 2 to 30 days, usually 5 to 14, so watch for fever for about a month after wading.

How does leptospirosis spread?

Through wounds, scrapes, leech bites, soaked skin and the eyes, nose and mouth contacting water or mud contaminated by animal urine. It generally does not pass between people.

Is leptospirosis dangerous? Can it be cured?

Treated early, most people recover well. Left untreated it can affect the kidneys, liver or lungs, so do not wait.

Calf pain after wading but no fever: should I see a doctor?

Pain in both calves that eases with rest is usually tired muscles. One swollen, red, warm calf, or a new fever, needs a doctor.

Are leech bites from floodwater dangerous?

Usually not, but they are an entry point for germs. Wash, cover and see a doctor if redness spreads or fever starts.

How can I prevent leptospirosis after a flood?

Avoid wading, wear boots and gloves, cover wounds, wash with soap afterwards, store food safely, control rats, and clean then disinfect home surfaces.

Does disinfection spraying prevent leptospirosis or remove mosquitoes?

Spraying reduces germs on home surfaces after cleanup, which is part of lowering risk, but it does not protect you while wading outside, does not treat illness and is not an insecticide.

Is there a disinfection service near me in Nong Suea, Pathum Thani in 2026?

WHD is based in Bang Khae, Bangkok, with no branch in Pathum Thani, but books jobs by phone 065-556-6294 and LINE @whd268. Send site photos first.

The Water Is Dropping at Soi Maliland 2026. Let WHD Finish the Job

Mud cleared, but still worried about floors, the kitchen and where rats have been? Talk to the WHD team and send photos for an assessment.

Book Post-Flood Disinfection Spraying

Call 065-556-6294 | LINE @whd268

World Health Disinfection, Bang Khae, Bangkok 10160. Jobs outside Bangkok by appointment via phone and LINE.

Related Services

• WHD Disinfection Spraying Service
• CHEMGENE HLD4H disinfectant
• Residential ozone disinfection for rotten-water odours

References

• Khaosod, flooding at Soi Maliland, Khlong 11, Nong Suea, Pathum Thani (5 Oct 2026 / B.E. 2569): https://www.khaosod.co.th/around-thailand/news_10426048
• Government Public Relations Department, DDPM data as of 7 Oct 2026: https://www.prd.go.th/th/content/category/detail/id/33/iid/548715
• World Health Organization, Fact sheets: https://www.who.int/news-room/fact-sheets
• CDC, Floods: https://www.cdc.gov/floods/
• Department of Disease Control, Thailand: https://ddc.moph.go.th/