Last updated: 8 Oct 2026 | 10 Views |
When the Mae Klong River spilled over its banks into the pomelo, lychee and coconut orchards of Amphawa District, Samut Songkhram, in 2026 (B.E. 2569), the water was expected to recede within days. What it leaves behind inside homes usually lasts much longer. One organism people rarely think about is Candida, a yeast that loves warmth and moisture: bathrooms that never fully dry, tiled floors with a film of silt, towels that will not dry in the rainy weather, and skin that stays wet for hours. This guide explains what Candida is, why the weeks after a flood raise the risk, which symptoms to watch for, who is most vulnerable, and where ozone disinfection after the Amphawa flood fits into a home recovery plan: clean first, dry thoroughly, then treat empty rooms.
According to Daily News on 2 October 2026 (B.E. 2569), the Mae Klong River overflowed its banks and flooded orchards and homes in Amphawa to above knee height. The water rose almost to the walkway on the Bang Nok Khwaek floodgate, and the grounds of several temples were nearly full of water. The Mae Klong Dam reduced its discharge from 2,150 to 1,889 cubic metres per second, and the water was expected to recede within two to three days (source: Daily News, 2 Oct 2026). Conditions change daily, so always follow local announcements as well.
Nationally, Thailand's Department of Disaster Prevention and Mitigation reported, as of 06:00 on 7 October 2026 (B.E. 2569), that flooding affected 27 provinces plus Bangkok, covering 123 districts and 984 sub-districts, with 1,154,875 households and more than 3.1 million people affected (source: Government Public Relations Department). Amphawa is one of many communities now starting the long job of cleaning up.
Amphawa has its own character. Many homes are wooden houses on the water, raised houses with open ground floors, or single-storey concrete homes set among orchard ditches. When the Mae Klong pushes up, the water does not just cover roads; it seeps under houses, into ground-floor bathrooms, kitchens and storerooms. That lingering dampness is exactly what yeasts and molds like best.
Example case written to illustrate a common situation. It is not an interview with any resident.
Auntie Daeng has lived most of her life in a single-storey concrete house behind a pomelo orchard. The bathroom sits at the back, beside an orchard ditch, slightly lower than the rest of the house. Every year some water seeps in during high tides, but never above the knee like this year. On the night the Mae Klong overflowed, water came through the back door and flooded the bathroom, the kitchen and the ground-floor bedroom where her six-month-old granddaughter slept with her mother.
Three days later the water was gone. The family swept out mud, washed floors and carried blankets outside to dry. But showers kept coming, nothing dried properly, water sat in the gaps between tiles, and the grout began to show slimy pinkish-grey streaks. A sour, stale-bread smell drifted out every time someone opened the bathroom door.
A week later the baby's mother noticed a red rash in the creases of the baby's thighs and under the nappy, and white patches inside her mouth that did not wipe away easily. Auntie Daeng, who had been washing things in water all day without gloves, developed red, swollen, painful skin around her nails. The family went to a doctor, who explained that these symptoms may be linked to Candida yeast, which thrives on skin that stays damp, and advised keeping the house dry and changing and washing fabrics often alongside treatment.
The family then made a new plan. They threw away the soaked doormat and mattress, scrubbed the bathroom, replaced stained grout, opened the house to cross-ventilation and ran a dehumidifier until the floors were dry. Only then did they contact a team to ask about ozone treatment for the bathroom, bedroom and kitchen on a day when everyone stayed with relatives.
Candida is a yeast: a single-celled fungus that multiplies by budding, unlike the thread-like molds that form fuzzy patches on walls. The best-known species is Candida albicans. Normally it lives on the skin and in the mouth, gut and genital area of many healthy people without causing problems, because the body and other resident microbes keep it in check.
Trouble starts when that balance is upset. Skin that stays wet and warm for too long, small abrasions, a weakened immune system or certain chronic conditions allow Candida to multiply and cause an infection called candidiasis. In most people this affects the skin, nails or mucous membranes. It is usually not serious, but it can be itchy, sore and very disruptive.
The link with floods is simple: Candida thrives where it is warm and damp. Wet skin rubbing inside rubber boots, sweaty rubber gloves, nappies that cannot be changed often enough during a power or water cut, and bathrooms that stay wet for days all create good growing conditions.
Most of the black and green mold that appears on walls after a flood is filamentous mold that releases spores into the air. Candida, by contrast, tends to live on wet surfaces: slimy films in bathrooms, drains, grout, kitchen sponges, damp cloths and human skin. It does not float through the air in the way mold spores do, so prevention focuses on washing, scrubbing and drying surfaces rather than air filtering alone.
Moisture lingers for days. Homes beside the Mae Klong and orchard ditches are always close to water. Even after the house drains, the ditches remain high, the ground under the house stays wet, and concrete floors keep wicking moisture upward. Indoor humidity stays high for many days.
Bathrooms are the hardest rooms to dry. Many provincial homes have bathrooms at the back or below floor level, with small windows and no extractor fan. Flood silt settles between tiles, under basins, around the toilet base and in floor drains, where microbial slime known as biofilm builds up.
Skin stays wet. During and after a flood people wade, wash, carry and work in orchards all day. Hands and feet are wet for hours inside boots and gloves. Softened skin with tiny abrasions is an easy place for yeast to multiply.
Water and power cuts. When electricity or tap water is interrupted, bathing, changing clothes and laundry all become harder. Babies in nappies and elderly people who need help are especially exposed to moisture rashes.
These spots harbour not only Candida but bacteria, molds and many other microbes carried in by floodwater, so recovery has to cover surfaces, drying and indoor air together.
The following is general information to help you notice changes in yourself and your family. It is not a diagnosis. If anyone has symptoms, see a doctor or pharmacist for proper advice.
Fever, spreading redness, pus or symptoms that do not improve need medical care. Anyone who waded through floodwater and develops a high fever, calf pain or red eyes must tell their doctor about the exposure, because this may be leptospirosis, which is unrelated to yeast and needs prompt treatment.
Health. A rash, a sore nail fold or mouth patches in a baby may look minor, but they disturb sleep and eating and can mean repeated clinic trips while some roads are still wet. Family members with allergies may also flare up in damp, moldy air.
Money and time. Pomelo, lychee and coconut growers must restore their orchards quickly. Taking time off to care for a sick child, or throwing away more bedding that has turned moldy, adds to losses already suffered.
Tourism and guesthouses. Amphawa is known for homestays and riverside guesthouses. A musty bathroom, slimy grout and towels that smell are the first things guests notice, and they show up in reviews. Getting rooms clean and dry before reopening matters.
Cleaning makes surfaces look fresh, but if water remains under tiles, in cracks and in failing grout, the slime returns within days. Drying matters as much as washing.
Musty, drain-like and sour smells come from microbes and residues. Sprays and deodoriser blocks add fragrance for a while but leave the source untouched. When the scent fades, the old smell returns.
Towels, doormats and blankets soaked in muddy water become a source of microbes against the skin unless they are washed thoroughly and fully dried. Thick mattresses and large rugs that cannot be dried usually have to go.
After a flood, the air in a room closed for days holds humidity, floating mold spores and odours trapped in curtains, ceilings and furniture. Wiping surfaces alone does not make the whole room feel clean. This is where ozone, after cleaning, plays a supporting role.
Ozone (O3) is a form of oxygen with three atoms and strong oxidising power. According to the company, ozone breaks down the cell structures of viruses, bacteria and fungi as well as odour molecules, then reverts to oxygen (O2), leaving no chemical residue on surfaces. The company states that its service has been tested and certified by Thailand's Department of Medical Sciences and Intertek (UK) for eliminating viruses, bacteria and fungi at 99.99%, according to the company's certification.
For Candida specifically, we do not claim ozone eliminates this yeast everywhere in a home. Candida belongs to the fungi, one of the groups WHD's ozone service targets according to the company, and you are welcome to ask the team for test data. Most importantly, ozone is a supporting step after washing, scrubbing and drying. It does not replace cleaning, replacing flooded materials, or medical care.
Ozone's strength is that the gas spreads through the whole room, reaching the air, corners, ceilings, the undersides of furniture and surfaces a cloth cannot reach. That suits musty bathrooms, bedrooms and storerooms after a flood. It does not penetrate deep inside wet porous materials such as thick mattresses, gypsum board or soaked carpet, which must be removed or discarded as appropriate.
High-concentration ozone used to treat rooms irritates the airways. Breathing it can cause a stinging nose, coughing and chest tightness, especially in children, older adults and people with asthma. Follow these rules every time:
Done correctly, ozone reverts to oxygen and leaves no residue, which suits homes with babies and older relatives where families do not want chemical smells lingering in bedrooms.
Candida is a yeast that normally lives on human skin and in the body. In healthy people it usually causes treatable skin, nail or mucous membrane infections. Babies, older adults, people with diabetes or weak immunity should take extra care and see a doctor when symptoms appear.
Common signs include itchy red rashes in skin folds, a stubborn nappy rash, white mouth patches, swollen nail folds and soggy skin between the toes. Other causes are possible, so get checked.
Possible causes include irritation from dirty water, Candida yeast, skin fungi or bacteria. Spreading rash, pus or fever needs a doctor.
Flush drains, scrub grout and edges, discard soaked mats, then dry the room with airflow and a dehumidifier. Once dry, ozone in the empty room helps reduce lingering odours.
The company states its ozone service targets viruses, bacteria and fungi at 99.99% according to its certification. Candida is a fungus, but we make no claim for this species specifically. Ask the team for test data, and always clean and dry first.
Do not stay in the room. It must be empty of people, pets and plants and kept closed, then rested and ventilated as the technician advises.
It depends on area, number of zones and site conditions. The team quotes after assessing photos or a survey. Call 065-556-6294 or LINE @whd268.
WHD is based in Bang Khae, Bangkok 10160, with no branch in Samut Songkhram. For Amphawa and other provinces, contact the team by phone or LINE to confirm travel and dates.
It depends on the house and weather. Floors and walls must be truly dry with no standing water. Health agencies advise starting cleanup and drying as quickly as possible, ideally within 24 to 48 hours, to limit mold growth.
Musty bathroom, damp downstairs bedroom, or a homestay getting ready for guests? Send photos and the team will help plan cleaning, drying and safe ozone treatment.
See the Ozone Disinfection Service
Call 065-556-6294 · LINE @whd268
World Health Disinfection, Bang Khae, Bangkok 10160. Provincial enquiries by phone and LINE. Pricing by quotation.
Health information here is general and is not a medical diagnosis.
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