Example Case: A Vegetable Seller at Tha Ruea Market and Red Eyes That Spread Through the House, 2026

Note: this is an illustrative example case built from situations commonly seen in riverside communities after floods. It is not the account of any specific person.

Jaew has sold vegetables and curry paste at Tha Ruea market for almost twenty years. On the morning the red flag went up to warn that the Pa Sak River was close to the top of its bank, she and her husband loaded crates, buckets, chopping boards and scales into their pickup and set up a temporary stall on higher ground. Two days later they waded back in to fetch the rest, helped neighbours stack sandbags, and, without thinking, wiped sweat from their eyes with muddy hands.

A few days later Jaew's right eye felt as if it had sand in it. By morning it was swollen, red and crusted. The next day her left eye followed, and then her daughter, who shares the bedroom. Her husband had no discharge at all, but both his eyes were deeply red, he had a high fever and his calves ached badly. The family assumed it was ordinary rainy-season pink eye, until a public health volunteer explained that the three of them might not have the same illness, and that a high fever with calf pain after wading in floodwater needed a hospital visit right away, with the flood exposure mentioned to the doctor.

The Tha Ruea, Ayutthaya Flood of 2026 (B.E. 2569): What the News Reported

According to Manager Online, on 29 September 2026 (B.E. 2569) a red warning flag was raised at Tha Ruea fresh market because the Pa Sak River was only about 10 cm from overflowing its bank. Vendors moved their goods out, shifted the market to a temporary site and laid sandbags, while the Rama VI Dam continued to release water. On 5 October 2026, the Royal Irrigation Department expected the water level below the Rama VI Dam to rise by roughly 1.00 to 1.20 metres and asked Tha Ruea District to stay on alert.

Nationally, the Department of Disaster Prevention and Mitigation reported, as of 06:00 on 7 October 2026 (published by the Government Public Relations Department), that floods had affected 27 provinces plus Bangkok, 123 districts and 984 subdistricts, with 1,154,875 households and more than 3.1 million people affected. Many of those households now face the same after-flood problems, and eye infections are among the most common complaints.

What Causes Red Eyes After a Flood?

Doctors usually call red eyes conjunctivitis, an inflammation of the thin membrane covering the white of the eye and the inside of the eyelids. After a flood, however, red eyes can come from several directions:

• Viral conjunctivitis: the most common and most contagious type, often starting in one eye and moving to the other, with watering, grittiness and clear discharge.
• Bacterial conjunctivitis: thicker yellow or green discharge, with lids stuck together in the morning.
• Keratitis (infection of the cornea): more serious, with strong pain, blurred vision and light sensitivity, seen especially in contact lens wearers or after soil, plant matter or debris gets into the eye.
• Red eyes as part of a whole-body illness: such as leptospirosis, which can cause deeply red eyes with high fever and calf pain.
• Non-infectious irritation: dirty water, cleaning chemicals, dust from dried mud, smoke, or allergy to mold spores in a damp house.

After a flood, all of these can happen at once. Do not assume every red eye is the same and buy eye drops on your own; the wrong product can make some infections worse. Letting a doctor examine the eye is the safest choice, especially if symptoms are severe or are not improving.

Which Germs Cause Eye Infections After a Flood? 12 Culprits

1. Adenovirus

One of the leading causes of conjunctivitis outbreaks. Expect redness, watering, a sandy feeling, swollen lids, sometimes a tender lymph node in front of the ear, a sore throat or mild fever. Adenovirus survives on door handles, towels, pillowcases and phones, so when people crowd together after a flood it can move through an entire household within days.

2. Enterovirus 70

The cause of acute hemorrhagic conjunctivitis, the type of pink eye that spreads fast in the rainy season. Symptoms start suddenly, with pain, heavy watering and bright red patches of blood on the white of the eye. It looks alarming and usually settles within one to two weeks, but it should still be checked by a doctor, and the person should keep away from others.

3. Coxsackievirus A24 variant

Another member of the enterovirus family that causes outbreaks of hemorrhagic conjunctivitis. It spreads through tears, discharge and contaminated hands, and in communities short of clean water where towels are shared, it can jump quickly from house to house.

4. Staphylococcus aureus

A bacterium that lives on many people's skin and in their noses. Dirty hands or small wounds near the eye can lead to conjunctivitis with thick discharge, swollen lids or styes.

5. Streptococcus pneumoniae

Best known for chest and ear infections, it is also a common cause of bacterial conjunctivitis in children, with pus-like discharge and lids stuck shut on waking.

6. Haemophilus influenzae

Despite the name, this is a bacterium, not the flu virus. It often causes sticky red eyes in young children, sometimes together with middle ear infection. See a doctor if the lids swell badly or fever is high.

7. Pseudomonas aeruginosa

A bacterium that thrives in water, wet soil, drains and anything constantly damp. It is a major cause of corneal infection in contact lens wearers, particularly when lenses or cases are rinsed with tap water or stored water. This kind of infection can progress fast and threaten sight, so pain, blurred vision or a white spot on the cornea means an eye doctor today.

8. Acanthamoeba

A single-celled organism found in water, soil and mud. It causes a painful corneal infection, mostly in contact lens wearers whose lenses touched tap water, well water or floodwater. Acanthamoeba can form cysts with tough walls that resist many disinfectants. The honest message is that prevention depends on keeping dirty water away from lenses, washing hands before handling them, and not wearing lenses while wading or cleaning. Disinfection spraying supports overall surface hygiene, but there is no claim that it kills Acanthamoeba cysts.

9. Fusarium

A mold that lives in soil and rotting plant material. It can cause fungal keratitis, often after a leaf, twig or splash of mud hits the eye. Vendors clearing spoiled vegetables or volunteers filling sandbags without eye protection are at risk. Symptoms tend to build over several days: pain, blurred vision, watering and sometimes a grey-white patch on the cornea.

10. Aspergillus

A mold that grows on damp walls, ceilings and soaked belongings after a flood. Its spores float easily. It can infect an injured cornea, and the spores can trigger itchy, red, watery eyes in people with allergies.

11. Leptospira (the cause of leptospirosis)

Many people do not know that leptospirosis can cause red eyes. Typically both eyes are deeply red, often without discharge, together with sudden high fever, headache and muscle pain, especially in the calves. The bacteria come from the urine of rats and other animals in floodwater and mud and enter through cuts, soaked skin or the eyes and mouth. This is a red eye you must not wait on: go to hospital and tell the doctor you waded through floodwater.

12. Sewage bacteria such as Escherichia coli

Floodwater that passes through drains, septic tanks and toilets carries faecal bacteria. Splashes in the eye or rubbing with dirty hands can cause irritation or infection. E. coli is not a leading cause of conjunctivitis, but it is a marker of how dirty the water and surfaces are, and a reminder to wash hands before touching your face.

How Does Conjunctivitis Spread, and Why Do Floods Make It Worse?

Most viral and bacterial conjunctivitis spreads by touch, not by looking at someone. The old belief that "you catch pink eye by making eye contact" is wrong. The germs travel when hands touch tears or discharge, then touch objects, and someone else touches those objects and then their own eyes. The main routes are:

• Contaminated hands rubbing the eyes, by far the most common route.
• Shared items: towels, handkerchiefs, pillowcases, glasses and eye makeup.
• High-touch surfaces: door handles, stair rails, remote controls, phones, market rails and change trays.
• Floodwater or dirty water splashing straight into the eye during cleanup or play.
• For some germs such as adenovirus, droplets from coughs and sneezes as well.

After a flood, these risks rise together: crowded rooms, too few clean towels, no washing machine, cloudy or no tap water, and a relocated market like Tha Ruea's with fewer handwashing points. Some eye viruses can survive on hard, damp surfaces for days, which is why one household can see red eyes passed around for weeks unless handwashing, separate towels and cleaning plus disinfecting of high-touch spots break the chain.

Red Eyes After a Flood: When Should You See a Doctor?

Most viral conjunctivitis improves within one to two weeks, but some signs should never wait. See a doctor immediately if:

• The eye is truly painful, not just itchy or gritty.
• Your vision becomes blurred or you see halos.
• Light hurts your eyes.
• You notice a white spot or haze on the clear front part of the eye.
• You wear contact lenses and have a red, painful eye. Remove the lenses and bring them and the case to the eye doctor.
• Soil, wood, plant matter or something sharp has entered the eye, or there was an injury.
• A chemical or cleaning product splashed into the eye. Rinse with plenty of clean water at once, then go to hospital.
• Both eyes are red together with high fever, headache and calf pain after wading in floodwater. Go to hospital and tell the doctor about the flood exposure.
• The eyelids and skin around the eye become red, hot and swollen, the redness spreads, or you have a fever.
• A newborn baby has red eyes or discharge.
• The person has diabetes, a weak immune system or recent eye surgery.
• Symptoms are not improving after a few days or are getting worse.

Tell the doctor about flood exposure, contact lenses and anyone at home with similar symptoms. This article does not name medicines or doses; the right treatment depends on the doctor's examination.

How to Prevent Red Eyes After a Flood: 12 Practical Steps

1. Wash hands with soap and clean water after touching mud, money, rubbish or animals, and before touching your face. Use alcohol gel only as a stopgap.
2. Do not rub your eyes; rinse them with clean water instead.
3. Wear protective glasses when hosing mud, pressure washing or using cleaning products.
4. Skip contact lenses while wading or cleaning, and never rinse lenses or cases with tap water or stored water.
5. Give everyone their own towel and face cloth, especially when someone has red eyes.
6. Wash the patient's pillowcases and sheets separately, in hot water if possible, and dry them fully.
7. Follow the doctor's advice on staying home from school or the stall to protect others.
8. Keep children out of floodwater and wash their faces and hands with clean water when they come in.
9. Clean high-touch surfaces daily: door handles, switches, remotes, phones, rails and stall counters.

Why Cleaning the House Yourself May Not Be Enough

Hosing out mud, scrubbing with detergent and running fans is the right first step. Yet there are gaps:

• Cleaning removes dirt but does not kill every germ. Ordinary detergents are designed to lift grime, not to disinfect.
• Home-mixed bleach is often the wrong strength. Too strong irritates eyes and lungs, too weak does little, and it must never be mixed with other bathroom cleaners because dangerous gases can form.
• There are more touch points than anyone remembers. Exhausted people scrub visible mud and forget handles, switches and rails.
• The person cleaning may be the one who is ill. Someone with red eyes should not do heavy cleaning, both to avoid spreading the infection and to keep chemicals out of sore eyes.

The World Health Organization and the US Centers for Disease Control and Prevention give the same advice for flooded homes: clean first, then disinfect surfaces that touched floodwater, especially food areas, bathrooms and children's items, and dry the building quickly to limit mold. WHD's spraying service follows exactly that order.

WHD Disinfection Spraying After the Tha Ruea, Ayutthaya Flood of 2026, With CHEMGENE HLD4H

World Health Disinfection (WHD) offers a disinfection spraying service for homes, shops, markets, offices and buildings. According to the service information, trained technicians spray and/or apply an Ultra Low Volume (ULV) fine mist of CHEMGENE HLD4H, a medical-grade disinfectant from the United Kingdom containing Benzalkonium Chloride and Didecyldimethylammonium Chloride.

What WHD's pages list: according to the service and product information, the disinfectant is stated to cover viruses, bacteria and fungi, including SARS-CoV-2 (COVID-19), human coronavirus 229E, RSV, influenza H1N1 and H5N1, hand-foot-and-mouth virus, norovirus, Salmonella and mycobacteria. The service page states 99.99% effectiveness, the product page states 99.85% against COVID-19 within one minute, and it is described as a broad-spectrum disinfectant.

The honest part: most of the eye germs in this article, such as adenovirus, enterovirus 70, coxsackievirus A24, Staphylococcus aureus and Pseudomonas, are not on the list WHD publishes, so we make no tested-kill claim for them. They belong to the virus and bacteria groups the product says it covers, and you are welcome to ask WHD for test data on any specific organism. Acanthamoeba cysts resist many disinfectants, so lens care and hand hygiene remain the main protection.

How the service works after a flood

1. Enquiry and assessment: call or message on LINE with the size of the area, the type of home or stall, and how high the water rose.
2. Mud removal and washing first: spraying comes after mud is removed and surfaces are washed, because dirt reduces how well any disinfectant works.
3. Zoning and preparation: put away food, dishes and personal items; the team plans the route and focuses on high-touch points.
4. Spraying: people and pets leave the zone being sprayed.
5. Re-entry: according to the service information, wait about 30 minutes before using the space normally, following the time the technicians give for each job.

According to the service information, the product and service cite recognition from the Department of Medical Sciences, Mahidol University, NHS England and the EN 14476:2013+A2:2019 standard. The current promotion includes a free CHEMGENE spray bottle and WELLGIENIC wet wipes, and a tax invoice is available.

WHD is based in Bang Khae, Bangkok 10160, and has no branch in Tha Ruea. Customers in Ayutthaya and other provinces can call or message on LINE to discuss the job and agree a suitable date. If a musty smell lingers, you can also ask about the ozone treatment service, which is done in an empty, closed space with no people, pets or plants inside.

10 Reasons to Disinfect After a Flood When Someone Has Red Eyes

1. It reduces germs on high-touch points, the main route for conjunctivitis.
2. Technicians reach corners and large areas more evenly than hand wiping.
3. It uses a medical-grade disinfectant stated to cover viruses, bacteria and fungi.
4. No risk of mixing chemicals at home at the wrong strength.
5. The person with sore eyes does not have to do heavy cleaning.
6. Market stalls and shops can reopen and show customers they took hygiene seriously.
7. It helps break repeat infections in a household.
8. It follows the WHO and CDC "clean first, then disinfect" principle.
9. According to the service information, the space can be used again after about 30 minutes, per the technicians' instructions.
10. Advice is available through the service page, phone and LINE.

Before and After Disinfection Spraying

Checklist After the Ayutthaya Flood of 2026

• Anyone with red eyes plus high fever or calf pain after wading has been to hospital.
• Contact lens wearers have switched to glasses during cleanup.
• Eye protection, gloves and boots are ready before going back inside.
• All mud is removed and surfaces are washed.
• The patient's towels, pillows and items are kept separate.
• WHD has been contacted to spray once washing is finished.
• Everyone leaves the sprayed zone and returns when the technicians say.
• A handwashing point with soap is set up at the door or stall.
• High-touch points are wiped daily until everyone has recovered.

Frequently Asked Questions About Red Eyes After a Flood

What causes red eyes after a flood?

Most often viruses such as adenovirus and enteroviruses, then bacteria; occasionally fungi or Acanthamoeba in the cornea, plus irritation from dirty water and chemicals.

How does pink eye spread? Can you catch it by looking at someone?

No. It spreads when hands, towels, pillows or shared objects carry tears or discharge to another person's eyes.

How long does pink eye last?

Viral conjunctivitis usually improves within one to two weeks. Strong pain, blurred vision, light sensitivity or no improvement means seeing a doctor.

What should I do if floodwater gets in my eye?

Rinse with plenty of clean water right away and do not rub. If there is debris, pain or worsening redness, see a doctor and mention the floodwater.

Red eyes, high fever and calf pain: could it be leptospirosis?

Possibly. Go to hospital immediately and say you waded through floodwater.

Can I wear contact lenses during a flood?

Better not while wading or cleaning, and never let tap water or floodwater touch lenses or cases.

Should I stay home from work or school with pink eye?

Follow your doctor's advice. Staying home while the eyes are watering heavily protects colleagues, customers and classmates.

Does disinfection spraying cure red eyes?

No. It reduces germs on surfaces to help stop spread. Anyone with symptoms should see a doctor.

Is there a disinfection service near me in Ayutthaya?

WHD is based in Bang Khae, Bangkok. Customers in Ayutthaya can call 065-556-6294 or LINE @whd268 to arrange a visit.

The Water Has Dropped in Tha Ruea 2026. Let WHD Finish the Job

Once the mud is gone, do not let red eyes keep circling through your home or stall. Talk to the WHD team.

See WHD Disinfection Service

Call 065-556-6294 | LINE @whd268

Related Services

• WHD disinfection spraying service
• CHEMGENE HLD4H disinfectant
• Ozone treatment service

References

• Manager Online, Pa Sak River near overflow at Tha Ruea market, 29 Sep 2026, and Rama VI Dam downstream alert, 5 Oct 2026: mgronline.com
• Government Public Relations Department, DDPM flood summary as of 7 Oct 2026: prd.go.th
• WHO Fact sheets: who.int
• CDC Floods: cdc.gov/floods
• Department of Disease Control, Thailand: ddc.moph.go.th