A typical scenario: five children at Grandma's house

Noon is a mother of two: a four-year-old and an eight-month-old baby. Her family lives in a housing estate in eastern Bangkok. When water started entering their soi on the night of 25 September, she and her husband took the children to her mother's house in an area that stayed dry. Her sister arrived with three children too. Suddenly a mid-sized townhouse held five children aged eight months to seven years, sharing a living room and two bedrooms.

It rained almost all day. The children could not play outside, so a single pile of toys passed from hand to hand: plastic blocks, soft toys, picture books and the TV remote the baby loved to chew. On day three, one of the cousins developed a low fever, a sore throat and refused to eat. The adults assumed it was a cold from the cool weather. The next day they spotted small red spots on his palms and soles, and sores in his mouth. That same night, Noon's baby developed a runny nose, a frequent cough and was breathing faster than usual.

Noon took the baby to hospital immediately; she had read that fast breathing and chest indrawing in infants are danger signs. On the way she kept asking herself where the infection came from, how to stop the other children catching it, and how to clean her own home after the water went down so that neither flood contamination nor the germs picked up during those crowded days would follow them back. This is a typical scenario rather than one specific family, but it is a common picture when heavy rain, floods and crowding come together.

Understanding hand, foot and mouth disease

HFMD is caused by enteroviruses and is most common in young children, especially those under five. In Thailand it is frequently seen during the rainy season, according to general information from the Department of Disease Control.

Common symptoms

• Fever, tiredness, poor appetite and sore throat, usually in the first days
• Sores or blisters in the mouth — on the tongue, gums and inner cheeks — making swallowing painful, so children refuse food and drink and may drool
• A rash or small blisters on the palms and soles, sometimes on the buttocks or knees

How it spreads

The virus spreads through saliva, nasal secretions, blister fluid and stool. Children catch it through direct contact, or by touching contaminated toys, utensils and surfaces and then putting their hands in their mouths. The virus can continue to be shed in stool for some time after symptoms improve, so handwashing after nappy changes and keeping toilets clean are crucial. Worth knowing: enteroviruses are non-enveloped viruses, so alcohol hand gel may not work as well as washing hands with soap and clean water.

Danger signs — go to hospital now

Most children recover on their own within several days to about a week, but some develop serious complications. Seek medical care immediately if a child has a high fever that will not come down, is very drowsy, vomits repeatedly, refuses fluids and passes little urine, startles or jerks unusually often, has trembling hands, an unsteady walk, limb weakness, laboured breathing or seizures.

Understanding RSV

RSV, respiratory syncytial virus, is a common respiratory virus in young children that typically peaks in the rainy season. In older children and adults it often looks like a cold, but in babies, toddlers, premature infants and children with heart or lung conditions it can reach the small airways and lungs, causing bronchiolitis or pneumonia. Older adults are another group who can become seriously ill.

Symptoms to watch

• Runny nose, cough, sneezing and fever at first
• Worsening cough, phlegm and wheezing
• In babies: feeding less, fussiness or unusual sleepiness

How it spreads

RSV spreads through droplets from coughs and sneezes and through touching contaminated surfaces and then the eyes, nose or mouth. It can survive for a while on hard surfaces such as cot rails, plastic toys, door handles and phones. In rooms closed up against the rain and packed with people, transmission becomes much more likely.

Danger signs

Go to hospital immediately if a child is breathing fast or with difficulty, the chest or ribs pull in with each breath, the nostrils flare, the lips or fingertips look bluish, the child cannot feed or drink, is unusually drowsy, or a young infant has a high fever. The information here is general health education, not diagnosis or treatment; medical decisions should be made with a doctor.

Why heavy rain and floods make both illnesses more worrying

Crowding. When homes flood, families move in with relatives or into temporary accommodation. Children from several households sleep together and share toys and cups, so one child's infection can quickly reach the others.

Closed rooms, little ventilation. All-day rain means windows stay shut, the air-con stays on, or everyone is in a small room. Respiratory droplets linger in the air and settle on surfaces.

Limited clean water and toilets. In homes where the water has just receded, or in temporary shelters, washing hands with soap after every toilet visit or nappy change can be harder — and HFMD spreads through stool.

Tired bodies and stress. Children sleep poorly and eat irregularly; adults are exhausted from moving belongings and cleaning. Everyone becomes more vulnerable.

Flood contamination on top. Beyond person-to-person viruses, flooded homes carry sewage bacteria, mold and other contaminants on floors, walls and submerged toys. WHO and CDC guidance notes that dampness lasting more than 24–48 hours encourages mold, which can aggravate children who already have breathing problems.

Who is most at risk

Babies under one year, premature infants, children with heart disease, lung disease, asthma or weakened immunity, children in nurseries and kindergartens, and older adults in the same household. Pregnant women should limit close contact with sick children and wash their hands often.

The impact on families when children fall ill during a flood

Health. Children with HFMD often have mouths too painful to eat or drink, risking dehydration. Babies with RSV may need hospital care for their breathing. All this happens when even getting to hospital is difficult: news reports said that on 30 September some roads, such as Si Burapha and Lat Phrao, still had 20–40 cm of water.

Money. Medical costs, transport and lost income when parents take leave pile on top of flood repair bills.

Time. Children with HFMD usually need to stay off school or nursery until a doctor and the school say they can return. If children in the household catch it one after another, the care period can stretch for weeks.

Emotional strain. Parents coping with a damaged home and a sick child at the same time often feel stressed and guilty. A clear prevention plan eases a lot of that anxiety.

Community. A nursery or kindergarten that reopens after the flood and sees several sick children at once may have to close temporarily, affecting other families and staff.

Why ordinary cleaning habits may fall short

Wiping toys with a damp cloth only. Removing visible dirt is a good first step, but it is not disinfection. Some virus can remain on surfaces and keep spreading.

Relying solely on alcohol gel. Gel is convenient, but for the enteroviruses behind HFMD, washing hands with soap and water remains the main recommendation.

Strong bleach on toys and cots. Wrongly diluted bleach can irritate children's skin and airways — especially children who are already coughing or wheezing. Sharp fumes in a closed room make things worse, and bleach corrodes some metals.

Air fresheners or incense to mask mustiness. Fragrances in a closed room can trigger coughing in children with sensitive airways, and they do nothing about mold or viruses.

Cleaning once and stopping. While a child is ill, new virus is shed every day. High-touch surfaces need regular cleaning and disinfection until everyone has recovered.

Chemgene HLD4H: a medical-grade disinfectant listed against HFMD virus and RSV

According to the product information, CHEMGENE HLD4H is a medical-grade high-level disinfectant made in England, used in hospitals, clinics, laboratories, schools, childcare and elderly care settings and homes.

What makes it relevant here is that the product information specifically lists activity against hand-foot-and-mouth virus and RSV, as well as influenza H1N1, norovirus, SARS-CoV-2, bacteria, fungi, mycobacteria and Salmonella. The page states it kills within 1 minute, shows 99.85% efficacy against COVID-19, and gives residual surface protection for up to 14 days.

For homes with small children, the product page says it is safe for people, pets and medical equipment when used as directed. It is biodegradable and non-corrosive to stainless steel, aluminium, rubber, plastic and fibreglass — the materials of toys, cot rails, strollers, high chairs and potties. Dilutions run from 1:30, 1:50, 1:60 and 1:100 to 1:200 depending on the job.

Listed tests and approvals include Mahidol University, NHS England, ISO 9001:2015, ISO 13485, SGS, Intertek, CE and EN 13727, EN 14348, EN 13624 and EN 14476 — the last being a standard for testing virucidal activity.

To be clear: a disinfectant reduces germs on surfaces and objects. It is not a medicine, it is not for skin, mouths or children's bodies, and it does not replace handwashing with soap, seeing a doctor, or isolating sick children as medically advised.

Steps to limit spread when a child is sick

1. Separate the sick child in their own room if possible, with their own toys, cup, spoon and towel, and one main carer.
2. Wash hands with soap and water after every nappy change, nose wipe and feed, and before touching other children — especially babies.
3. Clean before disinfecting. Remove saliva, food and dirt from toys and surfaces with water and detergent.
4. Disinfect with Chemgene HLD4H. Dilute according to the label, spray or wipe clean surfaces and leave for the label contact time. Focus on plastic toys, cot rails, tables, high chairs, door handles, light switches, remotes, taps, toilets and changing areas.
5. Rinse anything that goes in a mouth — teethers, baby toys, spoons — with clean water afterwards and let it dry before use.
6. Launder textiles — sheets, pillowcases, soft toys and towels — hot, as care labels allow, and dry them completely.
7. Ventilate whenever the rain stops, and repeat daily until the child recovers.

Returning home after the water recedes: getting the house ready for children

A flooded home always needs mud removal first. Shovel out silt, wash floors and walls with clean water and detergent, and discard soaked items that cannot be cleaned, such as soft toys, rugs and foam mats. Dry the house with ventilation, fans and dehumidifiers within 24–48 hours in line with general guidance, then disinfect surfaces with Chemgene at the label dilution. Keep children away from the work area and bring them back only when surfaces are dry and the house is well aired.

Priority areas in a home with small children include crawling and play floors, table legs and furniture edges toddlers cruise along, bathrooms, changing areas, cots, strollers, car seats and every toy that was under water. Hard plastic toys with no cavities can be washed, disinfected and rinsed; toys with battery compartments, hollow spaces or fabric filling that sat in floodwater are usually best discarded.

If the house has just been repainted, re-floored or refurnished after the flood, chemical odours may irritate the airways of a child recovering from RSV. You might consider the ozone chemical-residue removal service, which is done in an empty, closed space with no people, children or pets inside; re-enter only after the rest and ventilation period.

10 reasons families and nurseries choose Chemgene HLD4H right now

1. Listed against hand-foot-and-mouth virus — per the product information. See the full list on the Chemgene HLD4H product page.
2. Listed against RSV — the respiratory virus of most concern for babies in the rainy season.
3. Covers flood germs too — bacteria, fungi and Salmonella per the product information, so one bottle supports post-flood recovery.
4. Medical grade, made in England — used in hospitals, clinics and childcare.
5. Fast — the page states it kills within 1 minute.
6. Residual protection — up to 14 days per the product information, helpful while a child is still unwell at home.
7. Safe when used as directed — for people and pets, according to the product page, with no reliance on harsh fumes in a child's room.
8. Kind to children's gear — non-corrosive to plastic, rubber, stainless steel and aluminium.
9. Tested to virucidal standards — including EN 14476, plus listed testing by Mahidol University.
10. Local advice — ask about dilutions for homes or nurseries via World Health Disinfection, phone 065-556-6294 or LINE @whd268.

Before and after: a children's room with a disinfection plan

Example case: a community nursery preparing to reopen

This example case is an illustrative scenario, not a verified customer review. Teacher Ann runs a community nursery in eastern Bangkok for about thirty children aged two to four. Water entered the ground floor to about a hand-span deep, submerging toys on low shelves, nap mats and the carpet in the play corner. While the nursery was closed, Ann heard from parents that some children staying with relatives had developed HFMD symptoms.

Ann planned three phases with the nursery committee. Phase one was the building: discard the carpet, foam mats and soaked soft toys; wash mud from floors and walls; dry with fans for several days; then apply Chemgene HLD4H at the label dilution to floors, lower walls, the children's toilets, hand basins, tables and chairs. Phase two was toys: keep only hard plastic toys without cavities, wash, disinfect and rinse them, and put out fewer toys each day so staff could keep up with rotation and cleaning.

Phase three was after reopening: a morning check of every child for fever, mouth sores and hand or foot rashes, with parents called to collect any child showing symptoms and advised to see a doctor; teaching children to wash with soap before meals and after the toilet; disinfecting high-touch points several times a day; and sending parents a clear message explaining every step. The lesson is that effective protection combines building recovery after the flood, daily screening and ongoing disinfection.

Parents' checklist for heavy rain and after the flood

Every day

• Check every child for fever, mouth sores, hand or foot rashes, runny nose, cough and breathing
• Wash hands with soap and water — children and adults — especially before eating and after the toilet
• No sharing of cups, spoons or towels
• Clean, then disinfect toys and high-touch surfaces at the label dilution
• Air rooms whenever the rain stops

When a child is ill

• See a doctor as advised, and go to hospital immediately for any danger sign
• Separate the sick child and their belongings; keep babies and older relatives away
• Keep the child home from school or nursery until the doctor and school allow a return
• Encourage fluids and watch urine output

Returning home after the water recedes

• Adults remove mud and clean first; children stay out
• Wear gloves, boots and a mask while cleaning
• Discard soaked soft toys and mats; wash and disinfect hard plastic toys
• Dry the house, then disinfect surfaces with Chemgene per the label before children come back
• Adults with fever, calf pain or diarrhoea after wading should see a doctor and mention flood exposure

Frequently asked questions

Can I use Chemgene HLD4H on my child's hands or body instead of soap?
No. Chemgene is a surface and object disinfectant. It is not for skin, mouths or children's bodies. Washing hands with soap and water remains the main method.

Can my baby play with a mouthed toy right after disinfection?
Clean it first, disinfect at the label dilution and contact time, then rinse with clean water and let it dry before giving it back.

If I disinfect the house, will my children definitely not get HFMD or RSV?
Nothing guarantees 100% protection. Surface disinfection reduces spread through objects, but it must go together with handwashing, separating sick children, ventilation and seeing a doctor when symptoms appear.

Can I spray it on floors that still have flood mud?
No. Always remove mud and wash surfaces first, then apply Chemgene as the label directs.

Why isn't alcohol gel enough for HFMD?
The viruses behind HFMD are non-enveloped, and alcohol may work less well against them than against some other viruses. Health authorities therefore recommend washing with soap and water as the primary method.

How often should a nursery disinfect?
During an outbreak, clean and disinfect high-touch surfaces and toys daily, adding extra rounds during the day as needed, using the label dilution for each task and following local public-health advice.

My baby is breathing fast and the chest is pulling in. What should I do?
Go to hospital immediately. This is a danger sign of respiratory illness in infants; do not wait and watch at home.

Protect the children at home with proper surface disinfection

Ask World Health Disinfection about dilutions for toys, children's rooms and nurseries.

Order Chemgene HLD4H for Families

Phone 065-556-6294 · LINE @whd268 · worldhealthdisinfection@gmail.com

Related links

• Chemgene product range
• Disinfection services for homes, schools and nurseries
• Residential ozone disinfection service
• Contact World Health Disinfection

References

• 2026 Bangkok floods — Wikipedia
• Al Jazeera: Disaster zone declared across Bangkok
• Department of Disease Control, Thailand
• WHO fact sheets
• CDC: Floods