A Story from the Field: The Home Her Mother Was Waiting to Return To

Nida is thirty-nine years old and the only daughter caring for her mother, Somjit, who is sixty-two and halfway through a course of chemotherapy. Somjit has finished her fourth cycle out of six. Mother and daughter share a two-storey townhouse at the end of a narrow soi in the Thung Wat Don area of Sathorn district, Bangkok. It is a modest home, but it is where Somjit feels most like herself: her bedroom upstairs, her small altar by the window, the kitchen where she still likes to make rice soup when she has the energy.

When the 2026 floods reached their soi, water crept into the ground floor until it was about halfway up the shins, and it stayed for several days. Nida moved her mother to a relative's condominium across the river and went back alone each day to check on the house. When the water finally drained away, she opened the front door and was met by a heavy, sour smell of damp and mud. A clear tide line ran around the walls of the living room. Below the line, small black and green spots were already spreading in circular patches. The fabric sofa that had been sitting in the water smelled sharp and stale, and the wooden cabinet under the staircase had swollen so badly that its doors no longer closed.

The upstairs floor, where her mother's bedroom is, had stayed dry. But the musty smell had drifted up the stairwell, and Nida could notice it as soon as she opened the bedroom door.

Her mother was desperate to come home. Staying in someone else's home made her feel like a burden, and she wanted to rest in her own bed between treatments. Yet at their most recent appointment, the oncology team had reminded the family that in the days after each cycle, Somjit's immunity could drop, and she should avoid dust, mold and unclean surroundings. Standing in the living room, Nida asked herself a simple question with no simple answer: "With the house like this, when can Mum come back, and what do I actually need to do to be sure?"

Nida's question is shared by many families in Sathorn, Bang Kho Laem, Yan Nawa and nearby districts who have a member undergoing cancer treatment, recovering from a transplant, or taking medicines that suppress the immune system. This article explains why a home that has just come out of a flood carries extra risk for these patients, why the usual cleaning methods are not quite enough, and how disinfection fogging combined with ozone treatment can prepare the home step by step.

Why a Post-Flood Home Carries Extra Risk for People with Low Immunity

For a healthy adult, the mold and bacteria left behind after a flood might cause little more than a stuffy nose, some sneezing or a mild itchy rash. For someone whose immune system has been weakened by chemotherapy, the body has less capacity to fight off germs. What most people would dismiss as "just a musty smell" deserves more attention in that situation. Several sources of risk tend to exist in the same home at the same time.

• Mold spores in the air. Mold growing on walls, ceilings, upholstered furniture and wet carpets releases microscopic spores that float through the air and settle everywhere. Doctors have long recognized that certain molds can cause more serious lung problems in people with weakened immunity. Every patient's situation is different, so it is important to discuss individual risk with the treating doctor.
• Germs from floodwater and mud. Floodwater in the city is frequently contaminated with wastewater, sewage and rat urine. As mud dries on floors and door frames, it turns into dust that rises every time someone walks past. That dust can carry bacteria linked to stomach illness and skin infections, and it is one of the routes for leptospirosis, the disease Thai people call "rat urine fever".
• High-touch surfaces. Door handles, stair rails, light switches, the dining table and the kitchen counter are touched again and again. If they were splashed by floodwater, or handled by family members who have just been carrying soaked belongings, they can easily pass germs to the patient's hands.
• Moisture that has not left the structure. Concrete walls and wooden fittings that sat in water for days keep releasing moisture for weeks. That is why mold so often reappears even after it has been wiped away. The visible patch is gone, but the conditions that allowed it to grow are still there.

There is another factor that families often overlook. People receiving chemotherapy frequently experience fatigue and nausea, and many become unusually sensitive to smells. A strong musty odor, or the harsh chemical smell of heavy-duty cleaning products, can make them feel unwell enough that they cannot rest. Rest is an important part of recovering between cycles, so the air quality in the bedroom matters as much as the cleanliness of the floors.

Important note: This article provides general information about cleaning and disinfecting homes. It is not medical advice. Decisions about when a patient should return home should always be made together with the doctor or nurse who is managing the treatment.

The Burden Families Carry

Health. The biggest fear is infection during treatment. If a patient develops a fever or an infection, the next cycle may have to be postponed. That affects the treatment plan, and it can also be a heavy blow to the morale of everyone in the household.

Emotional wellbeing. For many patients, home is the place where they feel safest and most comfortable. Being away for a long time can lead to stress, low mood and poor sleep. Meanwhile the caregiver is stretched thin, travelling between the hospital, the relative's home and their own house, which is still in a mess.

Time and money. Most caregivers still need to work. Taking leave again and again to scrub the house, without ever being sure whether it is clean enough, is exhausting and costs income. Some families end up throwing away all their furniture simply because they do not know what can be saved and what cannot.

The caregiver's own safety. A family member who shovels mud and scrubs mold without a mask, gloves or rubber boots can unknowingly carry contamination back to the patient on their clothes, skin and hair. Protecting the person doing the cleaning is part of protecting the patient.

Uncertainty. Perhaps the hardest part is not knowing. Without a clear plan, families keep asking themselves whether today is the day it is safe, and every small cough or new spot on the wall brings back the doubt.

Why the Usual Fixes Fall Short in a Home with a Low-Immunity Patient

• Wiping everything with strong bleach. Diluted bleach has a role on hard surfaces that have already been cleaned of mud. Used at high strength in a closed room, however, chlorine fumes irritate the eyes and airways, which is the last thing a smell-sensitive patient needs. Bleach also loses much of its effect when organic matter such as mud is still present, and it must never be mixed with toilet cleaners or ammonia-based products.
• Running fans to dry everything out. Fans do speed up drying, but they also lift mold spores off surfaces and spread them through the whole house, including up the stairs to the bedrooms.
• Air-freshener sprays and scented candles. These only mask the smell for a short time. They do nothing to remove the cause, and they add more volatile compounds to the air the patient breathes.
• Painting over mold stains. If the wall is still damp, mold will grow back under the new paint within a few weeks, and the whole job has to be stripped and redone.
• Cleaning only the ground floor. Many families forget that odors and spores travel upward. The patient's bedroom may not have been flooded, but it can still need attention.
• Rushing the return. Bringing the patient home the day after a big clean, while the walls are still wet and the air still heavy, often means the family has to move them out again a few days later.

What a home like this needs is a complete process: removing the sources, disinfecting surfaces, dealing with spores and odors in the air, and allowing proper ventilation before the patient comes back.

The Solution: CHEMGENE HLD4H Disinfection Fogging Plus Ozone Treatment from World Health Disinfection

The World Health Disinfection (WHD) team uses two complementary methods to prepare homes for family members who need an especially clean environment.

1. Disinfection fogging service with CHEMGENE HLD4H. The disinfectant is applied as an ultra-low-volume (ULV) fine mist. Because the droplets are so small, they drift into corners, under the staircase, behind cabinets and along skirting boards where a cloth simply cannot reach. This helps reduce bacteria, viruses and mold on surfaces that were in contact with floodwater.

2. Ozone treatment service. Ozone is a gas that spreads evenly through a closed room. It reacts with odor molecules through oxidation, breaking them down instead of covering them up, and it helps deal with mold spores floating in the air. It is particularly well suited to the patient's bedroom and to rooms where a musty smell has soaked in deeply.

Step-by-Step Service Process for Homes with a Low-Immunity Patient

1. Site survey. The team checks how high the water reached, where mold has appeared, how damp the walls still are, and which rooms the patient uses most, so those can be prioritized.
2. Clean-up and sorting advice. Items that absorbed water and mold deep inside, such as flooded mattresses, carpets, cardboard boxes and foam-filled furniture, usually need to be discarded. Hard items that can be washed are cleaned separately. The patient should not be in the house during this stage.
3. Disinfection fogging. CHEMGENE HLD4H is applied across the ground floor, all flood-affected walls, the area under the stairs, the bathroom, the kitchen and every high-touch point throughout the house.
4. Ozone shock treatment. Rooms are sealed one zone at a time and the ozone generator runs for a period based on room size and odor intensity, covering both the ground floor and the upstairs bedroom.
5. Ventilation. Doors and windows are opened so fresh air can flow through for the full time the team specifies before anyone goes back in.
6. Re-check and aftercare advice. The team assesses the odor after treatment, advises on moisture control, and schedules a follow-up if the walls are still very wet.

10 Reasons Families in Sathorn Choose Disinfection and Ozone Treatment Before Bringing a Patient Home

1. It addresses germs on surfaces and spores in the air together, by combining our disinfection fogging service with our ozone treatment service.
2. The fine mist reaches corners and crevices a cloth cannot, reducing the places where mold can hide.
3. It uses CHEMGENE HLD4H, a disinfectant designed for surface disinfection.
4. It helps reduce the musty smell that makes a patient feel nauseous and unable to rest.
5. The patient stays away during the dirty work, avoiding direct exposure to dust and contamination.
6. There is a clear safety procedure with defined leave and return times, so the family can plan the homecoming day.
7. You get practical advice on what to throw away and what can be saved, so nothing is discarded unnecessarily.
8. The patient's bedroom is treated too, even if it was not flooded, because odors and spores travel upstairs.
9. It can be followed by our dust mite removal service for the patient's mattress and pillows.
10. Booking is simple by phone or LINE, with coverage across Sathorn, Bang Kho Laem, Yan Nawa and nearby districts.

Checklist Before the Patient Comes Home

Many families find it helpful to work through a simple checklist rather than relying on a feeling that the house "seems fine". Before your loved one returns, try to be able to tick every item below.

• All mud and moldy items have been removed from the house, and no piles of wet belongings remain in any corner.
• Walls and floors are noticeably drier, and no new mold patches have appeared over the past several days.
• The home has been disinfected and ozone-treated, and ventilation has been completed for the full recommended time.
• The patient's bedroom has no musty smell, and sheets, curtains and pillowcases have all been freshly washed.
• The ground-floor electrical system has been checked by an electrician.
• Hand gel, or a CHEMGENE HLD4H 750 ml disinfectant spray, is ready for wiping high-touch surfaces every day.
• The doctor or nurse in charge knows about the plan to return home and has not raised any additional restrictions.

If any item is not yet ready, there is no need to rush. Waiting a few more days until the home is truly prepared is better than coming back and having to leave again.

Daily Habits That Keep the Home Safer After the Patient Returns

Treatment gives the home a fresh start, but everyday routines decide how long that fresh start lasts. These habits are simple and are especially useful during the weeks right after each chemotherapy cycle.

• Manage humidity. Open windows on dry, sunny days and close them during heavy rain. If the ground floor still feels damp, a dehumidifier can help, but empty and clean its water tank regularly.
• Keep the patient out of cleaning work. Ask other family members to handle sweeping, mopping and any remaining mold spots, ideally while the patient is resting in another room with the door closed.
• Wipe high-touch points daily. Door handles, stair rails, light switches, remote controls and the dining table take only a few minutes to wipe each day.
• Watch for returning mold. Check the bottom of walls, behind furniture and inside cupboards once a week. Small spots caught early are much easier to handle.
• Keep the bedroom simple. Fewer soft furnishings mean fewer places for dust and spores to settle. Wash bedding weekly in hot water if the fabric allows.
• Follow the medical team's guidance. If the treating team gives specific advice about visitors, food or home hygiene, that advice always comes first.

Before and After Disinfection and Ozone Treatment

Customer Voice (Example Scenario)

"At first I thought I would just scrub everything myself. The team showed me that mold was hiding behind the cabinet under the stairs and along the skirting in several places. They had us take out everything that needed to go first, then they fogged and ran the ozone on the ground floor and in Mum's room upstairs. After the ventilation, the smell was so much lighter. I talked with her nurse, and then I felt confident bringing Mum home."

— Nida, townhouse in Thung Wat Don, Sathorn district (example scenario)

Frequently Asked Questions

Q: Can the patient stay in the house during disinfection and ozone treatment?
A: No. Nobody may be in the area during ozone treatment, and for a low-immunity patient we recommend staying away throughout the clean-up, fogging, ozone and ventilation stages, then returning last.

Q: Can the patient come home right after the work is finished?
A: Only after ventilation has been completed for the time the team recommends, and always after checking with the doctor or nurse in charge, because each patient's low-immunity period is different.

Q: The upstairs bedroom was not flooded. Does it still need ozone treatment?
A: If you can smell mustiness up there or the humidity is high, we recommend including it, because it is the room where the patient spends the most time.

Q: What should we do with the patient's medicines and medical equipment?
A: Remove them from the area or store them in sealed boxes before work begins, and let the team know in advance about any equipment that must stay plugged in.

Q: The mattress was not flooded but smells musty. Do we need to throw it away?
A: Not necessarily. A mattress that was not submerged can often be restored with room ozone treatment and our dust mite removal service. A mattress that was under floodwater should be discarded.

Q: Does this article replace medical advice?
A: No. It is general information about home cleaning. If the patient develops a fever or any unusual symptom, contact the treating hospital immediately.

Q: Which areas do you serve?
A: Sathorn, Bang Kho Laem, Yan Nawa, Bang Rak, Khlong Toei and neighbouring areas of Bangkok. Message LINE @whd268 to check availability.

Prepare the Home Before Your Loved One Comes Back to Recover

Book a site survey for your home in Sathorn or nearby districts today.

Book Ozone Treatment – Click Here

See Disinfection Service – Click Here

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

Related Links

• Residential ozone disinfection
• Ozone treatment for odors and chemical residue
• Master Ozone Generator
• All articles

Health reference: World Health Organization (WHO): Floods · Department of Disease Control, Thailand