A 4:30 a.m. alert to evacuate immediately at Moo 1, Hua Pa

According to Thansettakij, on 2 October 2026, between about 04:33 and 04:49, the Department of Disaster Prevention and Mitigation, working with mobile operators AIS, True and NT, sent a Cell Broadcast alert telling residents of Moo 1, Hua Pa sub-district, Phrom Buri district, Sing Buri, to evacuate immediately. The Chao Phraya had flowed over the embankment, and water outside the embankment was expected to rise by roughly 0.40 to 0.70 metres.

An evacuation in the middle of the night means families leave in a rush, carrying whatever they can grab. Some stay with relatives; others go to temporary shelters such as temples, schools or community halls. Dozens of people from many households end up sleeping, eating and sharing toilets together, while the chickens and ducks kept behind the house are often left where they are.

A typical scenario

The following is an example case, not the story of a real person.

Uncle Sermsak, 68, lives with diabetes and high blood pressure. He evacuated with his wife and two grandchildren to a temple pavilion shared by about fifty people. It rained all night, and mats and blankets were shared. Within three days people began falling ill with high fever, body aches, cough and sore throat, one or two at a time. His younger grandchild developed a high fever too. A village health volunteer arranged a hospital visit, where the doctor said the symptoms were consistent with influenza and advised separating sick people, wearing masks and washing hands often.

Sermsak had another worry: about twenty ducks and chickens left in the coop behind his house. When the water fell and he went back, several were dead and others looked listless. He nearly started collecting the carcasses with bare hands before his son stopped him and called the district livestock office first, because poultry that fall ill or die unexpectedly may be linked to bird flu and must be checked and handled properly by officials.

The story shows that after a flood, villagers face two kinds of influenza at once: one spreading between people in crowded spaces, the other coming from birds right next to home.

What is influenza A, and what do the H and N mean?

There are several types of influenza virus. Type A causes the widest outbreaks in both people and animals. Scientists classify its subtypes by two proteins on the virus surface, haemagglutinin (H) and neuraminidase (N), so names such as H1N1 and H5N1 describe which versions of those proteins a virus carries.

Although both are influenza A, H1N1 and H5N1 behave very differently:

• H1N1 today is one of the seasonal flu viruses that circulate among people every year. The current strain, H1N1pdm09, caused the 2009 pandemic and then settled into seasonal circulation alongside H3N2 and influenza B.
• H5N1 is a highly pathogenic avian influenza virus found in wild birds and poultry. Human infections are uncommon and mostly follow close, unprotected contact with sick or dead birds. According to the World Health Organization (WHO), sustained person-to-person spread has not been found.

Thailand faced H5N1 outbreaks in poultry around 2004 to 2006, and the Department of Livestock Development and the Department of Disease Control have run joint surveillance ever since. In recent years H5N1 has also spread among wild birds and some mammals in many countries, so health agencies worldwide continue to watch it closely.

How H1N1 spreads in shelters and homes after a flood

Seasonal H1N1 spreads mainly from person to person:

• Droplets from coughing, sneezing or talking at close range, the main route.
• Contaminated surfaces such as door handles, cups, spoons and remote controls, followed by touching the eyes, nose or mouth.
• Long periods in closed, poorly ventilated rooms with sick people.

Adults can usually spread flu from about a day before symptoms start until roughly five to seven days after falling ill, and young children and people with weak immunity may spread it longer. The incubation period is usually about one to four days.

Why floods raise the risk

1. Crowding. Dozens of people sleep side by side in a pavilion or classroom.
2. Limited toilets and clean water, so handwashing becomes irregular.
3. Shared items such as cups, plates, blankets and pillows passing between families.
4. Exhaustion, poor sleep, stress and missed regular medicines.
5. Season. The late rainy season is a peak period for flu in Thailand, as the Department of Disease Control warns every year.
6. Bringing the virus home. People who are recovering or still infectious return to houses, and home surfaces become contaminated in turn.

How H5N1 bird flu connects to flooding

H5N1 does not spread through human crowding the way seasonal flu does. After a flood, the risk comes from poultry and contaminated surroundings:

• Backyard birds that fall sick or drown, so people handle carcasses and sick birds more than usual, whether moving, collecting or butchering them.
• Birds that fall ill or die unexpectedly: if bird flu is the cause, their bodies, droppings and secretions can carry large amounts of virus.
• Coops and nearby ground contaminated with droppings, which floodwater can spread over floors and walls close by.
• Wild birds and poultry from elsewhere may be carried in or come looking for food in flooded areas.

According to the WHO and CDC, most human H5N1 infections follow close contact with sick or dead poultry, or contaminated environments, without protective equipment. Prevention therefore centres on one message: do not touch, butcher or eat sick or dead birds, and report them.

If you find sick or unexpectedly dead poultry

1. Do not touch them with bare hands, and keep children away.
2. Report to the district livestock office, a village health volunteer or the village head so officials can test and remove the birds safely.
3. Never butcher or cook sick or dead birds, feed them to other animals or throw them into waterways.
4. If officials ask you to help, wear gloves, a mask and boots, and wash your hands with soap immediately after removing them.
5. If anyone who touched sick poultry develops fever, cough, sore throat or red eyes within about 10 days, see a doctor and mention the poultry contact, or call the Department of Disease Control hotline on 1422.

Disinfecting coops and farms and disposing of carcasses must follow Department of Livestock Development guidance. The spraying service in this article focuses on spaces where people live and gather: homes, pavilions, schools and buildings.

Symptoms of H1N1 and H5N1 to watch for

Seasonal influenza H1N1

• Sudden high fever and chills
• Headache, strong muscle aches, fatigue
• Dry cough, sore throat, runny nose
• Some children also vomit or have diarrhoea

Most people recover within one to two weeks, but some develop complications such as pneumonia or flare-ups of existing illness. Doctors may consider antiviral medicine for some patients, so people in high-risk groups should see a doctor early.

Avian influenza H5N1 in people

Early symptoms can resemble flu: fever, cough, sore throat and aches, sometimes with red, inflamed eyes, and illness may progress to severe pneumonia. The key clue is contact with sick or dead birds, which must always be mentioned to the doctor.

Danger signs needing hospital care now

• Shortness of breath, difficulty breathing or chest pain
• Bluish lips
• Drowsiness, confusion or difficulty waking
• High fever lasting several days, or improvement followed by worsening
• Young children who cannot eat, pass little urine or have seizures
• People whose chronic illness is getting worse

If roads are still cut off, call 1669 for help.

Who is at risk of severe flu, and who is at risk of bird flu exposure?

Higher risk of severe seasonal flu

• Adults aged 65 and over
• Young children, especially under two
• Pregnant women
• People with chronic conditions such as lung disease, asthma, heart disease, kidney disease or diabetes
• People with weakened immunity
• People with severe obesity

The Department of Disease Control runs a seasonal flu vaccination campaign for high-risk groups every year. Ask your sub-district health promoting hospital or local hospital about eligibility and suitability.

Higher risk of bird flu exposure

• Backyard chicken and duck keepers and their families
• People helping to collect dead animals after the flood
• People who butcher or sell live poultry
• Children who like to play with chickens and ducks

The impact when flu strikes on top of a flood

Health

Older adults and people with chronic illness, already worn down by evacuation, can become seriously ill with flu, and when many fall sick at once there is no one left to care for anyone.

Money and livelihoods

Sick people cannot work during the very days they need to repair their homes. Farmers who lost poultry lose income too, and if bird flu is confirmed locally, animal-disease control measures can affect poultry sales across a whole village.

Time and community confidence

Illness passing from one family member to the next can delay home recovery by weeks. Temples, schools and halls used as shelters also need to return to normal use, and systematic cleaning and disinfection help people feel confident using them again.

Why ordinary cleaning is not enough

• Sweeping and rinsing with water removes mud but does not disinfect shared touch points.
• Wiping only tables while forgetting door handles, switches, taps and stair rails that everyone touches.
• Mixing cleaning products, such as bleach with toilet cleaner, which can release dangerous gases, as the CDC warns.
• Spraying insecticide or perfume, which does nothing against flu viruses.
• Blasting coops with high-pressure water, which can stir up dust and droppings; follow livestock officials' advice and wear protection.
• Cleaning once without a routine for shared touch points in shelters and public buildings.

What is missing is systematic surface disinfection of the whole area after washing, using a product with published data and applied safely by trained people.

WHD disinfection spraying for H1N1 and H5N1

World Health Disinfection (WHD) offers a disinfection spraying service for homes, buildings, schools and public spaces. According to the service information, trained technicians apply disinfectant by spraying and/or ULV (Ultra Low Volume) fogging to cover surfaces and corners.

The product is CHEMGENE HLD4H, a medical-grade disinfectant from the United Kingdom containing Benzalkonium Chloride and Didecyldimethylammonium Chloride. According to the product and service information, it is broad-spectrum against viruses, bacteria and fungi, and influenza H1N1 and avian influenza H5N1 are both named among the organisms it covers, alongside COVID-19, RSV and hand-foot-mouth virus. The service page states 99.99% efficacy, and the product page states 99.85% against the COVID-19 virus within one minute. These are the figures as stated by the product and service pages.

The service page also lists approvals and references including the Thai Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019, the European standard for testing the virucidal activity of medical disinfectants. Customers include hospitals, schools, malls, airports, offices, airlines, banks and residential buildings.

Being clear about the limits

Spraying reduces viruses on surfaces. It does not stop droplet spread between people standing close together, it is not a vaccine and it is not a treatment. Sick people must see a doctor. Coops, farms and poultry carcasses must be handled under Department of Livestock Development guidance first; if you want areas near animal pens sprayed, ask the WHD team whether that is suitable case by case.

How spraying works for homes and shelters after a flood

1. Book. Describe the space, for example a house, temple pavilion, classroom or community building, the number of rooms and where sick people stayed. Call 065-556-6294 or LINE @whd268.
2. Prepare. Clear mud, wash floors and walls with clean water and detergent, ventilate until dry, launder blankets, mats and pillowcases, and put food, dishes and personal items in closed storage.
3. Everyone leaves, including children, older people, anyone unwell and pets, while technicians spray.
4. Technicians spray and/or ULV-fog floors, lower walls, bathrooms, kitchens and shared touch points such as door handles, stair rails, switches, tables and chairs.
5. Wait as instructed. According to the service information, the usual wait is about 30 minutes before normal use. Always follow the re-entry time the technicians give on the day.
6. Afterwards, open windows, wipe food-contact surfaces with clean water before use, and set up handwashing points with soap.

According to the service information, customers receive a free CHEMGENE spray bottle and WELLGIENIC wet wipes, and a tax invoice is available, convenient for temples, schools and local administrations. If a musty smell lingers, WHD's residential and building ozone service can be considered as an add-on.

10 reasons homes and shelters should book spraying after a flood

1. H1N1 and H5N1 are on the list of organisms in WHD's service information.
2. Shelters have just hosted dozens of people with flu-like illness, so shared surfaces deserve disinfection before normal use resumes.
3. Flu viruses survive on surfaces for a time, and reducing them on handles, taps and tables cuts hand-to-face spread.
4. The post-flood period overlaps flu season, as the Department of Disease Control warns each year.
5. ULV mist reaches corners under tables, behind cupboards and across large open pavilions more evenly than hand-wiping.
6. A medical-grade, broad-spectrum product, according to the product information.
7. Trained technicians wear protective gear, know the risk points and advise on preparation.
8. Short downtime. According to the service information, the wait is about 30 minutes, so buildings can reopen the same day.
9. Tax invoices for temples, schools and local agencies.
10. Advice first on scope, areas near animal pens or test data via the disinfection service page.

Before and after: a temple pavilion used as a shelter

This comparison is illustrative; real results depend on the building and ongoing care.

Example case: a sub-district school that served as a shelter

This is an illustrative example, not a review from a real customer.

Director Wichai runs a small school near the Chao Phraya. During the flood he opened the classrooms as a shelter for about eighty villagers, and several developed influenza; health volunteers moved them to a separate room. When the water fell and families went home, he had one week to reopen for classes.

Teachers and the caretaker removed temporary mats and bedding, washed classroom floors, scrubbed the toilets and left the building open to the breeze for two days. Then he booked disinfection spraying. The technicians asked for learning materials, food and canteen dishes to be stored away and for everyone to stay outside during the work. After the wait they specified, teachers wiped canteen tables with clean water and set up handwashing stations outside every classroom.

On the first day back, the school asked parents to keep children with fever, cough or sore throat at home and see a doctor. Spraying gave the school a fresh start, Wichai says, but children's handwashing habits are what must be built every day.

Checklist to prevent seasonal flu and bird flu after a flood

Preventing H1N1

• Wash hands often with soap and clean water, or use alcohol gel when water is short.
• Anyone with fever or cough wears a mask, sleeps apart and stops sharing items.
• Cough or sneeze into a tissue or your elbow.
• Open windows when you can.
• Do not share cups, spoons or handkerchiefs.
• High-risk groups should ask their health service about seasonal flu vaccination.

Preventing H5N1

• Never touch sick or dead poultry with bare hands.
• Report sick or unexpectedly dead birds to the district livestock office, a health volunteer or the village head.
• Do not butcher, eat or sell sick or dead birds.
• Cook poultry and eggs thoroughly every time.
• Keep separate boards and knives for raw meat and wash hands after handling raw poultry.
• Keep children away from chickens, ducks and wild birds.

Restoring the home

• Clear mud, wash and dry first.
• Launder blankets, mats and clothes used in shelters before bringing them inside.
• Have wiring checked before using electricity.
• Book disinfection spraying after washing and drying; everyone leaves during application and returns at the time the technicians give.

Frequently asked questions about flu, bird flu and spraying

What is the difference between H1N1 and H5N1?

Both are influenza A viruses. H1N1 is seasonal flu that spreads easily between people. H5N1 is a bird disease; human infection is uncommon and usually follows close contact with sick birds, and according to the WHO sustained human-to-human spread has not been found.

Can floods give you the flu?

Floodwater does not carry seasonal H1N1 directly, but evacuation, crowding and difficult hygiene make it spread more easily.

Is it safe to eat chicken and eggs after a flood?

Poultry and eggs from reliable sources, cooked thoroughly, can be eaten as normal. Never cook birds that were sick or died unexpectedly.

Does WHD's disinfectant cover H1N1 and H5N1?

According to the service information, WHD's page names H1N1 and H5N1 among the organisms covered by its CHEMGENE HLD4H spraying service. Spraying reduces germs on surfaces; it does not replace handwashing, isolating sick people or vaccination.

Can you spray a chicken coop?

Coops and carcasses must first be handled under Department of Livestock Development guidance. For spaces near animal pens, ask the WHD team whether spraying is suitable.

How long after spraying can we go back in?

According to the service information, usually about 30 minutes, but follow the time the technicians give. Everyone leaves during application, and no disinfectant should be assumed to leave zero residue, so wipe food-contact surfaces with clean water before use.

I handled a dead chicken and now have a fever. What should I do?

See a doctor promptly and mention the poultry contact, or call the Department of Disease Control hotline on 1422 for advice.

Go home safely, protected from both kinds of flu

Recovery after a flood means caring for people, handling poultry correctly and restoring a clean home. Let WHD finish the job with surface disinfection in your home, pavilion or school once washing and drying are done.

Book post-flood disinfection spraying

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

Related links and references

WHD links

• WHD disinfection spraying service
• CHEMGENE HLD4H disinfectant
• Residential and building ozone disinfection

References

• Thansettakij, 2 October 2026: Cell Broadcast evacuation alert for Moo 1, Hua Pa: thansettakij.com
• World Health Organization: Fact sheets
• US CDC: Influenza, Bird Flu and Floods
• Department of Disease Control, Thailand: ddc.moph.go.th