Please note: this article is general health information, not a diagnosis. If your child has a fever, mouth sores or spots on the hands and feet, talk to a doctor or local health worker. Disinfection spraying cleans surfaces in the home; it does not treat illness and never replaces medical care.

Example case: a few days after coming home, a three-year-old stops eating

Note: this is a typical scenario built from situations families with young children often face after floods. It is not the account of any real person.

Kaew lives at Ban Tha Khoi in Klondo Subdistrict with her husband and their three-year-old daughter. In late September 2026 (B.E. 2569) heavy rain fell for days and the Mae Klong River rose fast. The family moved their belongings up high and evacuated to a temporary shelter with several neighbouring households. Many small children played together there, shared the same toys, ate snacks from the same bags and could not wash their hands often, because clean water was limited.

When the water dropped, the family returned and began shovelling mud. Kaew's daughter sat on a mat outside, mouthing toys from a box that had been under water. Days later she had a fever, refused food and cried when she drank. Kaew saw small sores on her tongue and cheeks, and the next day red spots and tiny blisters appeared on her palms and soles.

Kaew wanted to know two things: is this hand, foot and mouth disease, and are there still germs in the house? This article answers both.

What did the news report about the Ban Tha Khoi, Dan Makham Tia flood of 2026 (B.E. 2569)?

According to Bangkok Biz News on 30 September 2026 (B.E. 2569), homes at Ban Tha Khoi, Village No. 2, Klondo Subdistrict, Dan Makham Tia District, Kanchanaburi were flooded up to roof level, and residents evacuated to higher ground. The causes were continuous heavy rain combined with releases from the Mae Klong Dam of 2,184 cubic metres per second, with a possible peak of 2,500 cubic metres per second.

On 6 October 2026 (B.E. 2569), Bangkok Biz News reported that the Department of Disaster Prevention and Mitigation (DDPM) had sent a Cell Broadcast warning to people in Nong Phai and Dan Makham Tia subdistricts because the level of the Lam Phachi stream kept rising. So the Dan Makham Tia flood of 2026 was not a single event, and some families may have stayed in shelters or damp homes longer than expected.

Nationally, DDPM data as of 06:00 on 7 October 2026 (B.E. 2569), published by the Government Public Relations Department, showed flooding in 27 provinces plus Bangkok, covering 123 districts and 984 subdistricts, with 1,154,875 households or more than 3.1 million people affected.

We use only the facts above. The family story is an illustration. We do not claim that there was an HFMD outbreak at Ban Tha Khoi.

Why are young children more likely to catch hand, foot and mouth disease after a flood?

HFMD occurs all year in Thailand but tends to rise in the rainy season, which is exactly when floods happen. After a flood, several risks pile up at once:

• Crowding in shelters or relatives' homes. Children from many families play closely together and share toys, cups and towels, so saliva, nasal mucus and stool from one child reach another easily.
• Too little clean water for handwashing. Families save clean water for drinking, so washing with soap after the toilet or a nappy change happens less often.
• Shared or broken toilets. Enteroviruses are shed in stool for weeks, even after a child feels better, so shared toilets and nappy bins matter a great deal.
• Flooded toys and household items. Plastic toys, soft toys, mats and floors carry mud, sewage residue and germs from many sources, and toddlers put things in their mouths.

HFMD is not caused by floodwater itself. It spreads from person to person through hands, objects and contaminated surfaces. A flood simply creates conditions in which those routes work better, which is why home hygiene makes such a difference.

Hand, foot and mouth symptoms after a flood: which germs can cause them? Meet 11 culprits

Fever, mouth sores and spots on the hands and feet do not come from a single germ. The first group are the viruses that cause true HFMD. The second group are other germs that cause look-alike symptoms.

1. Coxsackievirus A16

The classic cause of HFMD in young children. Expect a mild to moderate fever, sore throat, shallow ulcers on the tongue, gums and inner cheeks, then red spots or small blisters on the palms and soles, sometimes the buttocks or knees. Most children recover in about a week, but painful sores can stop them drinking, so dehydration is the main concern.

2. Enterovirus A71 (EV71)

The type doctors watch most closely. Most children have ordinary HFMD, but in a small number this virus can affect the nervous system and heart. Warning signs include a fever that will not come down, unusual drowsiness, repeated vomiting, startle jerks during sleep, trembling hands, unsteady walking and fast or laboured breathing. Any of these means hospital now, not watching at home.

3. Coxsackievirus A6

In recent years this type has been linked to a more widespread rash that can appear on the arms, legs, trunk or around the mouth and may resemble chickenpox. Weeks later, some children shed fingernails or toenails, which usually grow back.

4. Coxsackievirus A10 and related enteroviruses

These cause both HFMD and herpangina, in which a child has fever, a very sore throat and small ulcers at the back of the palate and uvula, often with no rash on the hands or feet. It spreads and is prevented in exactly the same way.

5. Coxsackie B viruses and echoviruses

Another group of enteroviruses spread through stool, saliva and dirty hands. They usually cause fever, a red body rash, sore throat or mild diarrhoea, but newborns and very young babies can become seriously unwell. Families with a newborn should take extra care when an older child at home is sick.

6. Herpes simplex virus type 1

In toddlers, this virus can cause gingivostomatitis: high fever, swollen red gums that bleed easily and many sores across the mouth and lips. Early on it looks like HFMD, but there are no spots on the palms and soles. It spreads through saliva, kisses and shared spoons and cups. A doctor will tell the two apart.

7. Varicella-zoster virus (chickenpox)

Chickenpox produces itchy clear blisters that start on the trunk and face and appear in crops at different stages. It can be confused with widespread HFMD. It spreads through the air very easily in crowded shelters.

8. Staphylococcus aureus

A leading cause of impetigo, a superficial skin infection that begins as red spots or fragile blisters and turns into honey-coloured crusts, often around the nose and mouth or on scratched arms and legs. Small cuts from wading and skin that stays damp after floods help it get in.

9. Streptococcus pyogenes (group A strep)

This bacterium also causes impetigo and is behind strep throat in older children: fever, a very sore throat, red swollen tonsils and sometimes white patches or tiny red spots on the palate. It can be mistaken for HFMD, and care differs, so see a doctor.

10. Candida albicans

This yeast causes oral thrush in babies and toddlers: white, milk-like patches on the tongue, gums and inner cheeks that do not wipe off easily and make feeding painful. Poorly cleaned teats and toys stored damp after a flood can harbour it.

11. Adenovirus

Adenoviruses cause fever, sore throat, red eyes and sometimes diarrhoea. They persist on toys and door handles and spread easily where children gather.

Norovirus, rotavirus, RSV and influenza can also leave children too unwell to eat and drink. A parent's job is not to guess the germ but to watch symptoms, prevent dehydration and seek help when red flags appear.

How does hand, foot and mouth disease spread, and for how long?

The enteroviruses behind HFMD spread in several ways: direct contact with saliva, nasal mucus and phlegm, or droplets from coughs and sneezes; contact with fluid from burst blisters; stool, which carries the virus for weeks after recovery; and contact with contaminated surfaces and objects such as toys, bottles, door handles, stair rails, toilet seats and dining tables, followed by hand-to-mouth contact.

The incubation period is usually about three to six days, and children are most contagious in the first week of illness. Thai public health guidance advises that sick children stay away from school or nursery until they recover, generally about seven days, and that carers wash hands with soap after every nappy change or toilet clean-up.

One fact many people do not know: enteroviruses have no outer envelope, so they tolerate alcohol better than many other viruses. Alcohol gel alone may not be enough. The recommended approach is washing hands with soap and clean water for at least 20 seconds, cleaning surfaces with detergent first and then applying a suitable disinfectant according to the manufacturer's instructions.

When should a child with hand, foot and mouth disease see a doctor right away?

Take the child to a doctor or the nearest emergency department immediately if you notice:

• High fever lasting more than two days, or fever so high the child is drowsy and hard to wake
• Repeated or forceful vomiting, or vomiting everything they eat
• Frequent startle jerks during sleep, trembling, unsteady walking or weak arms and legs
• Fast or laboured breathing, pale or cold skin, or an unusually fast pulse
• Severe headache, stiff neck or a seizure
• Refusing water or milk, much less urine, a nappy dry for more than six to eight hours, a dry mouth, or crying without tears
• Any fever in a baby under one year old
• Sores that become red, swollen, spreading or pus-filled

Tell the doctor about the flood, the shelter stay and any contact with floodwater, so other causes such as leptospirosis or gut infections are considered too. While caring for the child at home, do not give medicines without advice from a doctor or pharmacist.

How can you prevent hand, foot and mouth disease after a flood?

In a shelter or at a relative's home: wash children's hands with soap before meals, after the toilet and after shared play; give each child their own cup, bottle, spoon and towel; tell shelter staff if a child develops fever, mouth sores or spots; bag used nappies and wash hands at once.

When you move back home: let adults clear the mud and clean first, then bring small children back, and do not let them play on muddy floors; sort the toys, wash hard plastic ones in soapy water, scrub crevices, rinse and disinfect according to the product label, and discard soft toys and sponges soaked by floodwater; replace flooded bottles and teats if possible, or clean and heat-sterilise them as the maker advises; use bottled or boiled water for drinking and formula; clean the bathroom and nappy area every day, not just once; open windows to lower humidity.

If a child is already ill: keep them home, clean their toys daily, wash hands after every nappy or feed, and offer soft, cool foods and frequent sips of water.

Why is washing the house not quite enough when there are young children?

Washing away mud with detergent is the most important step. But homes flooded to roof level, as at Ban Tha Khoi in 2026, leave thin mud in grout and under cupboards; some people mix cleaning products, which can release harmful fumes, or wipe disinfectant off before its contact time; and exhausted families rarely reach every room. Many therefore clean first and bring in professionals to finish. The World Health Organization (WHO) and the US Centers for Disease Control and Prevention (CDC) both advise that flood-contaminated surfaces should be cleaned first and then disinfected.

How does WHD's disinfection spraying help homes with young children after the Kanchanaburi flood of 2026 (B.E. 2569)?

World Health Disinfection (WHD) provides a disinfection spraying service carried out by trained technicians who spray and/or ULV-fog (Ultra Low Volume fine mist), according to the service information. The disinfectant is CHEMGENE HLD4H, a medical-grade product from the United Kingdom containing Benzalkonium Chloride and Didecyldimethylammonium Chloride.

According to WHD's service information, it covers viruses, bacteria and fungi, and the page lists organisms including the hand-foot-mouth virus, COVID-19, RSV, influenza H1N1 and H5N1, with a claimed 99.99% efficacy. The page also lists approvals or testing linked to the Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019. Other germs in this article, such as herpes simplex, adenovirus, Staphylococcus, Streptococcus and Candida, belong to the virus, bacteria and fungi groups the product says it covers, but the website does not show organism-specific test results for them. Ask WHD directly if you would like test data for a particular organism.

The process for a home after a flood:

1. Assessment: discuss the job by phone or LINE and send photos.
2. Mud removal and washing first: spraying only follows clearing and washing, because disinfectant works best on clean surfaces.
3. Zoning and preparation: put food, dishes, bottles and washed toys away in closed storage; everyone, including children and pets, leaves the zone being sprayed.
4. Spraying: zone by zone, focusing on bedrooms, bathrooms, play corners and high-touch points.
5. Re-entry: the service information says to wait about 30 minutes before using the space normally. Always follow the re-entry time the technicians give for your job and ventilate before small children go back in.

WHD is based in Bang Khae, Bangkok 10160, and has no branch in Kanchanaburi. Upcountry jobs are arranged by phone and LINE so the team can assess the site and agree a suitable date. Customers receive a free CHEMGENE spray bottle and WELLGIENIC wet wipes under the promotion on the service page, and a tax invoice is available. For homes with a lingering musty smell, you can also ask about the residential ozone disinfection service as a complementary option.

10 reasons homes with young children should disinfect after a flood

1. Toddlers crawl and sit on floors, so they touch surfaces far more than adults.
2. Children put hands and toys in their mouths, giving surface germs a direct route in.
3. The hand-foot-mouth virus is among the organisms WHD's disinfection service page lists as covered.
4. It finishes the clean-up and reaches corners hand wiping can miss.
5. It lightens the load on parents exhausted from days of clearing mud.
6. It helps reduce repeat spread when one child has just recovered and siblings share the house.
7. Technicians wear protective equipment and work by zones, so family members do not handle concentrated chemicals.
8. The product information cites testing to EN 14476 for viruses.
9. It suits community nurseries reopening after the flood; see the WHD service page.
10. It helps families move back in with more confidence, alongside daily handwashing and good hygiene for children.

Before and after disinfection: a family home near Dan Makham Tia, 2026 (B.E. 2569) (example case)

Note: this is an illustrative example of the process, not a review from a specific customer. Spraying does not treat a sick child; children with symptoms need a doctor.

Checklist before bringing children home after the Dan Makham Tia flood of 2026 (B.E. 2569)

• ☐ Check electrical safety and the structure before moving back in
• ☐ Shovel mud and wash floors, walls and furniture with clean water and detergent
• ☐ Wear boots, rubber gloves and a mask; keep children away from mud clearing
• ☐ Sort toys: wash hard ones, discard contaminated soft toys and sponges
• ☐ Replace or sterilise bottles, teats and children's dishes
• ☐ Clean the bathroom, basin and nappy area
• ☐ Keep soap and clean water by the toilet and kitchen
• ☐ Disinfect surfaces after cleaning, or call a professional team
• ☐ Ventilate and reduce humidity in children's bedrooms
• ☐ Watch children daily for one to two weeks and see a doctor for fever, mouth sores or spots

Frequently asked questions: hand, foot and mouth disease in children after a flood

Is hand foot and mouth disease after a flood caused by the floodwater?

Not directly. It spreads person to person through saliva, mucus, stool and contaminated objects. Crowding and scarce clean water after a flood make spread easier.

My child has mouth sores but no spots on hands or feet. Is it HFMD?

It may be herpangina, herpes simplex or a bacterial throat infection. A doctor should check.

How does hand foot and mouth disease spread?

Through saliva, mucus, cough droplets, blister fluid, stool, and contaminated surfaces or toys followed by hand-to-mouth contact.

How long does hand foot and mouth disease last?

Most children recover in about seven to ten days. Prevent dehydration and watch for red flags such as drowsiness, repeated vomiting, startle jerks or fast breathing.

Which HFMD symptoms are dangerous?

Fever over two days, drowsiness, repeated vomiting, startle jerks, weak limbs, fast breathing or refusing fluids. See a doctor at once.

Does hand sanitiser stop hand foot and mouth disease?

Enteroviruses tolerate alcohol better than many viruses. Wash with soap and water first and use gel only when water is unavailable.

How do I clean toys after a flood?

Wash hard toys in soapy water, scrub crevices, rinse and disinfect per the label. Discard soft toys and sponges soaked by floodwater that cannot be cleaned.

How long should a child with HFMD stay home from school?

Usually until recovered, about seven days, or as the doctor and school advise.

Can disinfection spraying treat hand foot and mouth disease?

No. Spraying cleans home surfaces to help reduce germs in the environment. A sick child needs a doctor.

Is there a disinfection service near me in Kanchanaburi?

WHD is in Bang Khae, Bangkok, with no Kanchanaburi branch, but takes upcountry jobs by appointment on 065-556-6294 or LINE @whd268.

The water is down in Dan Makham Tia in 2026 (B.E. 2569). Let WHD finish the job before your children come home.

Unsure about germs in bedrooms, bathrooms and play corners? Talk to WHD.

Book Post-Flood Disinfection

Call 065-556-6294 | LINE @whd268

World Health Disinfection, Bang Khae, Bangkok 10160. Upcountry jobs by appointment via phone and LINE.

Related services

• World Health Disinfection spraying service
• CHEMGENE HLD4H disinfectant
• Residential ozone disinfection for musty post-flood homes

References

• Bangkok Biz News, flooding at Ban Tha Khoi, Klondo, Dan Makham Tia (30 Sep 2026): https://www.bangkokbiznews.com/news/news-update/1254260
• Bangkok Biz News, DDPM Cell Broadcast for Nong Phai and Dan Makham Tia (6 Oct 2026): https://www.bangkokbiznews.com/news/news-update/1255257
• 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/