Example Case: A School Day Off After All-Night Rain in Chai Nat, 2026

This is an illustrative example case based on situations common after urban flooding. It is not the account of a real individual.

Phum is six and lives in a lane near Phrom Prasert Road. On 25 September 2026, after rain that had fallen since the previous day, his school announced a one-day closure. With shin-deep water outside, Phum and a friend spent the morning jumping, sliding and dunking their heads in the murky water. His mother bathed him afterward but did not notice water still trapped in his ear.

Two days later his ear itched, then hurt so much he could not lie on that side. Tugging the earlobe made him cry, and clear yellow fluid seeped out. Grandma suggested coconut oil and a cotton bud. His mother took him to the doctor instead, who found an inflamed, swollen ear canal and explained that nothing should be put into the ear at home.

Meanwhile his older sister, who already had a cold, developed a different earache: deep pain, muffled hearing and fever. That was a middle ear infection following her cold, not floodwater. Earache after a flood comes in several forms with different germs.

The Chai Nat Town Flood of 2026 (B.E. 2569): What the News Reported

According to MGR Online on 25 September 2026, more than 18 hours of continuous rain caused flooding at several points in Mueang Chai Nat:

• Phrom Prasert Road: about 20 to 30 cm, worst at the Wat Si Wichai junction.
• Wongto Road: about 10 to 20 cm.
• Around Chai Nat Provincial Hall: about 20 to 30 cm.
• Around Anuban Chai Nat School: about 20 cm, and the school closed for one day.

The report does not say water entered homes, so we do not claim it did. But when schools close and streets flood, children often play in the water, and urban floodwater commonly carries drain water and dirt full of bacteria. Nationally, the DDPM reported as of 06:00 on 7 October 2026 that floods had affected 27 provinces plus Bangkok, 123 districts, 984 sub-districts, 1,154,875 households and more than 3.1 million people.

Outer Ear Infection, Middle Ear Infection and Chronic Discharge: What Is the Difference?

• Outer ear infection (otitis externa, "swimmer's ear") happens when water sits in the canal, the skin softens and bacteria or fungi from dirty water invade. Signs: itching, pain that worsens when the ear is tugged, a swollen canal, discharge and muffled hearing.
• Acute middle ear infection (acute otitis media) is common in children after colds or allergies, as germs from the nose travel up the Eustachian tube. Signs: deep ear pain, fever, blocked hearing, and in toddlers fussiness and ear pulling. If pressure bursts the eardrum, pus drains and pain often eases.
• Chronic suppurative otitis media is a long-lasting eardrum perforation with recurrent discharge. Dirty water can pass straight through the hole into the middle ear and cause a flare.

In short: floodwater in the ear usually causes outer ear infection, post-flood colds cause middle ear infection, and people with a perforated eardrum risk flare-ups when water gets in.

What Germs Cause Ear Infections After Water Gets in the Ear?

Only a doctor can tell which germ is responsible, sometimes by culturing the discharge.

Bacteria common in outer ear infection and chronic discharge

1. Pseudomonas aeruginosa. A water-loving bacterium found in standing water, drains, mud and wet bathroom surfaces, and a leading cause of outer ear infection after water exposure and of chronic ear discharge. Its pus can be greenish with a strong smell. In older people with diabetes or weak immunity it can spread into the skull base, a severe condition called malignant otitis externa that needs hospital care.

2. Staphylococcus aureus. Lives on skin and in the nose of many people. It invades soaked or scratched canal skin and can form a painful boil in the canal. Some strains resist many medicines, so do not buy ear drops on your own.

3. Proteus mirabilis. A gut and environmental bacterium abundant in sewage and soil, found in chronic ear discharge and some outer ear infections, often with foul-smelling pus.

4. Klebsiella pneumoniae and Escherichia coli. Gut bacteria plentiful in sewage that floodwater pushes onto streets. They are occasional causes of outer ear infection and chronic discharge, especially in people with health conditions.

Fungi (otomycosis)

5. Aspergillus niger and other Aspergillus species. Fungal ear infection is common in hot, humid countries and after repeated wetting. Aspergillus lives in dust, soil and damp post-flood homes. Expect intense itching and a blocked feeling; doctors may see white threads with black dots.

6. Candida albicans. A yeast that thrives in warm, moist places, causing creamy white debris, itching and weeping, more often in people with diabetes or constantly damp ears.

Bacteria behind middle ear infection (usually after a cold)

7. Streptococcus pneumoniae (pneumococcus). A top cause of acute middle ear infection in children, spread by coughs, sneezes and hands, and more easily in crowded post-flood homes and shelters. Vaccines cover some types; ask your doctor.

8. Non-typeable Haemophilus influenzae. Another major cause in children. Despite its name, it is a bacterium, not the flu virus.

9. Moraxella catarrhalis. The third common bacterial cause in young children, often alongside colds and sinusitis.

10. Streptococcus pyogenes (group A strep). The throat-infection germ, sometimes behind more severe middle ear infection and skin infection around the ear.

Viruses that open the door

11. Respiratory viruses: RSV, influenza, rhinovirus and adenovirus. These do not come from floodwater, but they spread easily in the rainy season when people crowd together. A cold swells the Eustachian tube, fluid collects in the middle ear and bacteria grow. A child with a cold who develops new fever or ear pain should see a doctor. Notably, RSV and influenza H1N1 are named on WHD's service page among the organisms the disinfectant covers.

Why Do Ear Infections Rise After Floods?

• Children play in floodwater, especially on school closure days, dunking their heads repeatedly.
• Urban floodwater carries sewage and far more bacteria than pool water.
• Ears stay damp in humid weather with towels that never dry.
• Cotton buds push water and wax deeper and scratch the canal.
• Crowding spreads colds, which lead to middle ear infections.
• Shared items such as earphones, pillowcases, towels and flood-soaked toys harbor germs.
• People with perforated eardrums forget to protect their ears while wading or bathing.

Schools deserve special attention. When a kindergarten such as those around the Provincial Hall area reopens after a flood day, dozens of small children share mats, toys, taps and toilets within hours. One child with a cold can pass it to many classmates, and some of them will go on to develop middle ear infections over the following week. Teachers and parents can help by keeping children with fever or ear discharge at home, making sure each child has their own towel and cup, washing hands before meals and after the toilet, and cleaning and then disinfecting shared surfaces before the first day back. These are simple steps, but together they cut the chain of colds that so often ends in an earache.

Where Ear-Infection Germs Hide at Home and School After the Water Drops

1. Bathrooms, wet floors and floor drains, favorite places for Pseudomonas.
2. Shared towels and hair towels that never fully dry.
3. Pillowcases and mattresses used by someone with a draining ear.
4. Earphones, earbuds and earplugs that are shared or never cleaned.
5. Flood-soaked toys such as dolls, balls and rubber toys.
6. Kindergarten classrooms and nap rooms with shared mats, tables and toys.
7. Door handles, stair rails and dining tables touched by children with runny noses.
8. Damp, moldy corners that release fungal spores into the air.

Who Is Most at Risk After the Chai Nat Flood of 2026?

• Young and kindergarten-age children, whose short, flat Eustachian tubes make middle ear infection after a cold more likely, and who love playing in water.
• People with a perforated eardrum or chronic ear discharge.
• Older adults and people with diabetes, at risk of severe Pseudomonas outer ear infection.
• People with weakened immunity.
• Hearing-aid and frequent earphone users, whose ear canals stay warm and damp.
• Rescue workers, volunteers and waste collectors who work in the water.

Ear Infection After a Flood: When Should You See a Doctor Right Away?

Ear pain or discharge always deserves a medical check. Go to hospital immediately, or call 1669 in Thailand, if you notice:

• Swelling, redness or tenderness behind the ear, or the ear being pushed outward (possible mastoiditis).
• Facial drooping, inability to close the eye or a drooping mouth on the same side.
• Severe headache, stiff neck, drowsiness, confusion or seizures.
• High fever, especially in children under two, or a child who cries constantly and pulls the ear.
• Severe spinning dizziness or sudden hearing loss.
• Older adults or people with diabetes who have severe ear pain, worse at night, with persistent discharge.
• Redness spreading from the canal to the ear or cheek.
• Bloody discharge, or discharge lasting more than a few days.

Tell the doctor: when water got in your ear, any history of perforated eardrum, ear tubes or ear surgery, diabetes or weak immunity, and anything you have put in the ear.

Water in the Ear After Wading: Correct Care

• Tilt the affected ear down, gently tug the earlobe and let the water drain.
• Dry only the outer ear and canal opening with a clean towel.
• Do not insert cotton buds, hairpins or fingers.
• Do not put oil, herbs, alcohol or any liquid into the ear yourself, especially if the eardrum may be perforated.
• If water stays trapped, pain grows or fluid drains, see a doctor.
• People with chronic ear discharge should ask their doctor how to keep water out while bathing or wading.

How to Prevent Ear Infections After a Flood: 12 Practical Steps

1. Keep children from swimming, jumping or playing in street floodwater.
2. Keep your head out of the water when wading, and shower afterward.
3. After bathing, tilt to drain and dry the outer ear.
4. Stop using cotton buds; earwax is a natural barrier.
5. If you have a perforated eardrum, ask your doctor how to protect it.
6. Do not share earphones, earplugs or towels, and clean earphones regularly.
7. Wash pillowcases and towels more often and dry them fully.
8. Wash hands often, cover coughs and keep sick children home.
9. Blow the nose gently, one side at a time.
10. Ask your doctor about flu and pneumococcal vaccines.
11. Clean flood-soaked toys and discard soft toys that cannot be washed.
12. After the water drops, remove mud, wash, dry, then disinfect bathrooms, children's rooms and touch points.

Why Cleaning It Yourself May Not Be Enough

Mud removal and scrubbing always come first. But bathrooms and drains keep a slimy film where water-loving bacteria live, kindergartens and homes have many shared touch points, chemicals are often wiped off too fast or mixed dangerously, and damp corners regrow mold. The WHO and CDC advise cleaning, then disinfecting, flood-contaminated surfaces, and a professional team makes that step more thorough and safe.

WHD Disinfection Spraying After the Chai Nat Flood of 2026, With CHEMGENE HLD4H

World Health Disinfection (WHD) provides a disinfection spraying service for homes, schools, buildings and businesses. According to the service information, trained technicians spray and/or ULV-fog (Ultra Low Volume fine mist). The disinfectant is CHEMGENE HLD4H, a medical-grade disinfectant from the United Kingdom containing Benzalkonium Chloride and Didecyldimethylammonium Chloride. Customers listed on the page include hospitals, schools, malls, offices and residential buildings.

The service page states coverage of viruses, bacteria and fungi, naming COVID-19, RSV, H1N1, H5N1 and hand, foot and mouth disease virus, with a stated 99.99% efficacy; the product page also mentions norovirus, Salmonella and fungi and describes it as broad-spectrum. The pages list approvals and references from the Department of Medical Sciences, Mahidol University, NHS England and EN 14476:2013+A2:2019.

Being straight about specific germs: of the germs in this article, RSV and influenza H1N1 are named on the service page. Pseudomonas, Staphylococcus, Proteus, Klebsiella, E. coli, Streptococcus, Haemophilus, Moraxella, Aspergillus and Candida are not on WHD's published lists, so we make no organism-specific claims. They belong to the bacteria and fungi groups the product says it covers; ask the WHD team for test data on any specific organism. Most importantly, spraying is for home surfaces only. Never spray or drip any disinfectant into the ear, and spraying does not treat ear infection.

The WHD post-flood process

1. Survey: send photos or video via LINE showing the area, water height and priorities such as bathrooms, children's rooms or classrooms.
2. Mud removal and washing first.
3. Zoning: food, small toys and bedding for washing are set aside.
4. Spraying by zone: technicians in protective gear treat touch points, bathrooms, floors and lower walls, with ULV for large areas. Nobody, including children and pets, stays in the zone.
5. Re-entry: about 30 minutes according to the service information; follow the technicians' timing.

We do not claim the product leaves no residue. Ventilate after re-entry and rinse toys children put in their mouths. Per the website promotion, customers receive a CHEMGENE spray bottle and WELLGIENIC wet tissues, and a tax invoice is available. Prices depend on the site, so please ask. WHD is based in Bang Khae, Bangkok 10160, with no branch in Chai Nat; upcountry jobs are booked by phone and LINE according to the schedule. For musty rooms, ask about the complementary residential ozone disinfection service.

10 Reasons to Disinfect After a Flood When Your Child Has Had Ear Infections

1. Bathrooms and wet areas host water-loving bacteria, and post-flood disinfection closes them out.
2. It reduces cold germs on shared surfaces, the starting point of middle ear infection.
3. RSV and influenza H1N1 are named on the service page.
4. It suits kindergartens and childcare centers before reopening.
5. ULV reaches under beds and behind cupboards.
6. It supports drying efforts on damp, mold-prone surfaces.
7. A medical-grade disinfectant with published approvals replaces home mixing.
8. Technicians wear full protection, so your family avoids direct contact with chemicals.
9. Re-entry is about 30 minutes per the service information.
10. Get advice first via the service page, phone 065-556-6294 or LINE @whd268.

Before and After: A Home With Young Children

Checklist After the Chai Nat Flood of 2026

• ☐ No playing or dunking in floodwater.
• ☐ Shower after wading; drain and dry the outer ear.
• ☐ No cotton buds and nothing dripped into ears.
• ☐ Separate towels, earphones and pillowcases.
• ☐ Mud removed, house washed and dried, then WHD spraying booked.
• ☐ Out of the zone during spraying; back in when technicians say.

Frequently Asked Questions About Ear Infections After a Flood

Why does my ear hurt after floodwater got in?

Usually an outer ear infection from bacteria such as Pseudomonas or Staphylococcus, or a fungus, entering softened canal skin.

Is an ear infection after a flood dangerous?

Most are treatable, but swelling behind the ear, facial drooping, high fever, severe headache, or severe pain in an older person with diabetes needs hospital care immediately.

What is chronic ear discharge?

A middle ear problem with a perforated eardrum and recurring pus that flares easily when dirty water gets in.

Can I use a cotton bud to dry my ear?

No. Tilt the ear to drain and dry only the outer ear.

Can I put oil or herbal drops in my ear?

No, especially if the eardrum may be perforated. Let a doctor examine and treat it.

My child has a cold and an earache. Is it from the flood?

Probably a middle ear infection after the cold, which spreads easily when people crowd together during floods. See a doctor if there is fever or severe pain.

What does a fungal ear infection feel like?

Intense itching, blocked hearing and a full feeling, sometimes with white or black debris. A doctor needs to clean and treat it.

How do I prevent ear infections after a flood?

Keep heads out of floodwater, shower afterward, keep ears dry, stop using cotton buds, do not share personal items, and prevent colds.

Does disinfection spraying treat ear infections?

No. It treats home surfaces only. Never put disinfectant in the ear. Anyone with symptoms should see a doctor.

When can children go back into a sprayed room?

About 30 minutes per the service information. Follow the technicians' timing and ventilate.

Is there a disinfection service near me in Chai Nat in 2026?

WHD is based in Bang Khae, Bangkok, with no Chai Nat branch, but books upcountry jobs by phone 065-556-6294 and LINE @whd268, subject to schedule.

The Water Has Dropped in Chai Nat in 2026. Let WHD Finish the Job

Remove the mud, wash and dry the house, then let our team disinfect bathrooms, children's rooms and shared touch points.

See the Disinfection Service

Call 065-556-6294 | LINE @whd268

Related Services

• World Health Disinfection spraying service
• CHEMGENE HLD4H disinfectant
• Residential ozone disinfection

References

• MGR Online, flooding in Mueang Chai Nat, 25 Sep 2026: https://mgronline.com/local/detail/9690000093493
• Government Public Relations Department, DDPM figures as of 7 Oct 2026: https://www.prd.go.th/th/content/category/detail/id/33/iid/548715
• World Health Organization, Deafness and hearing loss fact sheet: https://www.who.int/news-room/fact-sheets/detail/deafness-and-hearing-loss
• CDC, Floods: https://www.cdc.gov/floods/
• Department of Disease Control, Thailand: https://ddc.moph.go.th/