A story from the field: the Monday morning queue reached the front door

Napha is a medical technologist and the owner of a small medical technology clinic in a shophouse in the Si Yan area of Dusit district. The clinic has a waiting area with a row of padded chairs, a specimen reception counter, a blood draw room with two reclining chairs and a laboratory at the back. In the lab, automated analyzers sit on raised workbenches, there is a refrigerator for reagents, and consumables are stored in cabinets under the counters. Most of her clients are older people coming for annual check-ups, people with diabetes who have fasted before their blood test, and company employees doing pre-employment health checks.

In early October 2026, several days of heavy rain overwhelmed the drains in the soi. Water rose into the clinic to somewhere between ankle and mid-shin height and stayed for two days. The analyzers on the raised benches were safe, but the under-counter cabinets holding boxes of blood collection tubes and some consumables, the legs of the waiting-room chairs, the floor of the blood draw room and the lower walls all sat in floodwater. The power was also cut for a while, which meant every reagent in the refrigerator had to be re-checked for suitability.

When the water receded, Napha and her staff washed the floors and wiped every surface they could see. But a damp, musty smell lingered in the waiting area. Green mold had appeared along the edges of the plywood under the counters, there was a tide line on the lower walls and the waiting-room cushions gave off a smell whenever someone sat down. On the first Monday after reopening, the queue for blood tests stretched to the front door. An elderly woman who had been waiting only a short while began to cough. Her daughter asked, "This place was flooded, wasn't it? My mother has allergies. Is it safe for her?"

The question stopped Napha in her tracks. She knew the laboratory already had its own biosafety procedures, but mold and musty odor in the building after a flood were a different problem. "Many of our clients have weak immune systems," she said. "We can't ask them to sit and wait in a room with mold."

This is a realistic example scenario based on the kinds of situations service teams meet after floods, not a news report. But it describes a challenge facing many small healthcare businesses in low-lying parts of Bangkok this year.

Why medical technology clinics need careful recovery after a flood

Vulnerable clients

Many people who come for blood tests are elderly, living with chronic disease, pregnant or feeling weak after fasting. They are more sensitive to mold spores and germs than the general public. The waiting area and blood draw room therefore need to be clean in terms of both surfaces and air.

Health risks after a flood

• Germs from floodwater: Water from drains carries bacteria such as E. coli onto floors, walls and furniture legs, raising the risk of diarrheal illness if people touch these surfaces and do not wash their hands.
• Leptospirosis: Standing water in shophouses and drains may be contaminated with rat urine. Staff who clean up should wear rubber boots and gloves.
• Mold and allergies: Spores from plywood cabinets, chair cushions and damp walls can trigger allergies, asthma and coughing in clients and staff.
• Skin rashes and infections: These are common among people in contact with floodwater and mud for long periods.

The clinic's credibility

Clients choose a medical technology clinic for accuracy and cleanliness. If they walk in and smell mold or see stains, their confidence in the clinic's results and standards can drop immediately, even though the laboratory itself is working to standard.

Equipment and materials to protect

A lab contains analyzers, centrifuges, reagent refrigerators, computers and a large amount of consumables. Disinfection and odor removal must therefore be planned so they do not affect this equipment and do not disrupt the clinic's existing workflows.

Continuity of care

Some clients depend on regular testing, such as people with diabetes monitoring their blood sugar or patients who need results before a doctor's appointment. A long closure can delay their care. That makes a fast but careful recovery especially important for this kind of business.

Staff wellbeing

Clinic staff spend eight hours or more a day in the same rooms. Many of them were also affected by the flood at home, and they come to work tired and stressed. Breathing musty, spore-laden air all day adds headaches, blocked noses and coughs to that burden, and a sick technologist cannot easily be replaced at short notice in a small clinic. Restoring clean, fresh air in the workplace is therefore not only about clients. It also protects the small team that keeps the clinic running, reduces sick leave during a busy recovery period and helps everyone concentrate on accurate, careful work.

Common methods that do not cover everything

• Wiping everything visible with alcohol: Good for small surfaces, but it does not reach under counters, behind cabinets or into chair cushions that hold moisture.
• Pouring strong bleach across the room: The harsh chlorine smell bothers clients, and the fumes may corrode metal parts of equipment.
• Running air-conditioning and fans all day: This speeds up drying but does not disinfect, and it may carry mold spores into the air-conditioning system.
• Air freshener sprays: These mask the odor briefly, but the mold remains in plywood cabinets and cushions.
• Repainting straight away: If the wall is still damp, mold will blister the new paint.

The common problem is that these methods only deal with what can be seen, while mold and musty odor after a flood hide inside porous materials and hard-to-reach corners.

The solution: Chemgene HLD4H fogging and controlled-dose ozone by WHD

The World Health Disinfection (WHD) team provides a disinfection fogging service using Chemgene HLD4H, applied with ULV (ultra-low volume) foggers in the waiting area, blood draw room, specimen reception counter, toilets and under-counter spaces. This is followed by an ozone treatment service at a controlled dose to reduce mold spores and break down musty odor trapped in chair cushions, plywood cabinets and walls.

Importantly, WHD's service cares for the building environment after a flood. It works alongside the biosafety system and cleaning procedures the clinic already has. It does not replace laboratory standards, analyzer calibration or reagent quality checks, which should continue to be carried out by the clinic's responsible staff and equipment manufacturers according to their usual procedures.

Step-by-step process for medical technology clinics

1. Survey with the responsible medical technologist: The team divides the clinic into zones: waiting area, counter, blood draw room, laboratory, storeroom and toilets. They record the water level, mold spots and equipment that needs protection.
2. Advice on sorting and mud removal: The team recommends separating consumables whose packaging got wet from the rest of the stock, in line with the clinic's own policy, and washing mud off surfaces before fogging.
3. Protecting instruments and specimens: No work is done while specimens or analyses are in progress. Analyzers, centrifuges, computers and reagent refrigerators are closed or tightly covered with plastic. Sensitive reagents and materials are moved out of the treatment area.
4. ULV disinfection fogging: A fine mist covers floors, lower walls, chair legs, blood draw chairs, handrails, toilets and under-counter spaces. Laboratory bench tops are cleaned by wiping according to the clinic's own procedures.
5. Controlled-dose ozone treatment: The area is closed and the generator runs according to room size. During this time no people, pets or plants may be inside.
6. Ventilation: Doors, windows and fans are opened so ozone breaks down into oxygen before staff are allowed back in.
7. Joint re-check: The team walks through with the clinic's responsible person to check odor and mold spots, and advises on humidity control in the consumables storeroom.

Ozone safety: Ozone is very effective against mold and odor, but it must not be inhaled at high concentrations. The team cordons off the area, posts no-entry signs and ventilates until it is safe. Treatment is therefore best scheduled outside service hours, for example on Saturday evening or Sunday.

For wiping touchpoints in the waiting area during the day, such as armrests, signing pens and queue ticket machines, the clinic can conveniently use Chemgene HLD4H spray (750 ml).

Where mold hides in a small clinic after a flood

Even after a thorough wipe-down, some spots in a clinic tend to keep producing that musty smell. The WHD survey pays particular attention to them.

• Under-counter cabinets: Plywood and particleboard soak up water from the floor and stay damp for weeks. The back panels, which are rarely seen, often grow mold first.
• Waiting-room cushions: Foam inside padded chairs can absorb water through the legs and base, and it releases odor whenever someone sits down.
• Skirting boards and door frames: These wick water upwards from the floor and are easily missed.
• Behind the refrigerator and analyzer benches: Narrow gaps with little airflow stay humid long after the room looks dry.
• Air-conditioning units: Filters and drain pans can harbor mold after a period of high humidity. A technician should clean them before the clinic fully reopens.
• Toilets and specimen collection areas: Grout, the base of toilets and the area under sinks need careful attention, especially in clinics that collect urine specimens.

Planning to reopen without leaving clients waiting too long

Medical technology clinics have clients who need tests on schedule, such as people with diabetes who track their blood sugar or patients sent by a doctor before an appointment. A long closure affects their care too. The team therefore often splits the work into zones, starting with the waiting area and blood draw room, which clients use most. Work is done outside opening hours and the rooms are fully ventilated before the clinic opens the next morning.

In the meantime, the clinic should let clients know in advance via LINE or phone about the dates of any closure, and put a notice at the entrance explaining that the clinic has been cleaned and disinfected after the flood. Clear communication helps clients, especially older people and their families, return with peace of mind.

Special attention for the blood draw room

The blood draw room is where clients are closest to staff and where the skin is deliberately broken, so it deserves extra care. After the flood, check the reclining chairs carefully: upholstery seams, the underside of the seat and the base where water may have collected. Arm supports and the small trolley that holds tourniquets, swabs and tube racks should be cleaned and disinfected according to the clinic's procedures before the room reopens. Any sharps containers that were standing on the floor during the flood should be sealed and replaced. Once the room has been fogged, ozone-treated and ventilated, wipe all touch surfaces again just before the first client of the day, so the room is ready in every sense.

Fogging and ozone: why both steps matter

It is easy to think of disinfection and odor removal as one job, but they work on different targets. Fogging with Chemgene HLD4H delivers disinfectant as a fine mist that settles on surfaces: floors, walls, furniture, counters and fixtures. It deals with the film of contamination left by floodwater on the things people touch. Ozone, on the other hand, is a gas. It moves through the air of the whole room and penetrates porous materials such as foam cushions, fabric, plywood and plaster, where mold spores and odor molecules hide. Using fogging first and controlled ozone second gives a clinic the best chance of being clean both on the surface and in the air, which is exactly what vulnerable clients need.

Keeping referring doctors and partners informed

Many medical technology clinics receive clients referred by nearby doctors' clinics, hospitals or companies. A short note to these partners explaining that the clinic was affected by the flood, what has been done to restore the premises and when normal service resumes helps maintain trust and keeps referrals flowing. It also gives partners the information they need to reassure their own patients and employees.

Preparing for the next rainy season

Low-lying parts of Dusit may face heavy rain and drain overflow again. Consider moving consumables out of under-counter cabinets into raised, sealed storage, installing a simple flood barrier at the entrance, and keeping a checklist of what to lift and switch off when a warning comes. Recording what was damaged this time also helps with planning and with future insurance claims. Some clinics schedule a routine disinfection and ozone check at the end of the rainy season as part of their annual maintenance.

The first 72 hours: what the clinic team can do

1. Safety first: Do not switch power back on for flooded floors or under-counter sockets until a qualified electrician has checked them.
2. Protect staff: Wear boots, gloves and masks when removing mud, and cover cuts, because of the leptospirosis risk.
3. Document everything: Photograph water lines, affected cabinets and stock before moving anything, for insurance and quality records.
4. Follow your own quality procedures for reagents and consumables: Check reagent storage conditions after the power cut and quarantine anything whose packaging was wet, according to the clinic's policies and manufacturer guidance.
5. Contact equipment vendors: Ask manufacturers or service engineers what checks are needed for analyzers and centrifuges after a flood and power interruption.
6. Remove mud while it is soft: Dried mud becomes dust that carries germs into the air and onto equipment.

Once these steps are underway, the WHD team can focus on the building itself: disinfecting surfaces in every zone and treating the air and porous materials with controlled ozone.

10 reasons medical technology clinics in Dusit choose WHD

1. Uses Chemgene HLD4H disinfectant, designed for high-level disinfection and suited to healthcare settings.
2. ULV foggers reach under counters, behind cabinets and around chair legs.
3. Controlled-dose ozone treatment reduces musty odor in chair cushions and plywood cabinets.
4. Works alongside the lab's biosafety system without disrupting existing procedures.
5. Clear steps for covering or removing analyzers, computers and reagents.
6. Scheduling outside service hours so the clinic can open as normal.
7. Zoned work so the waiting area and blood draw room are ready first.
8. Advice on humidity control in consumables storage.
9. Follow-on mosquito spraying around buildings with standing water.
10. Easy to reach by phone and LINE, with advice before you book.

Before and after disinfection and ozone treatment

Customer voice (example scenario)

"What we liked was that the team understood the lab has its own procedures. They weren't there to replace them, but to help with the mold and smell in the building. They worked on Sunday and covered every instrument first. On Monday morning we opened as usual, and none of the older clients waiting complained about the smell."

— Napha, medical technologist and clinic owner in Si Yan, Dusit (example scenario)

Aftercare checklist for clinics

• Run a dehumidifier in the consumables storeroom and keep boxes off the floor.
• Wipe armrests, blood draw chairs, pens and queue ticket machines with disinfectant during the day.
• Have a technician clean air-conditioning filters and drain pans.
• Wait until walls are completely dry before repainting, and schedule painting for a day off.
• Check under-counter cabinets regularly and deal with any new mold spots quickly.
• Watch for returning musty odor during the first two to four weeks, and ask the team for a re-assessment if needed.

Frequently asked questions

Q: Does this service replace the lab's safety procedures?
A: No. WHD's service cares for the building environment after a flood and works alongside the clinic's existing procedures. Specimen handling, waste management, instrument maintenance and quality control remain the responsibility of the clinic and should continue exactly as set out in its own manuals.

Q: Will ozone affect our analyzers?
A: The team uses a controlled dose and recommends covering instruments tightly, while sensitive reagents and materials are moved out of the treatment area. Post-flood checks on instruments should follow the manufacturer's guidance.

Q: How many days will the clinic need to close?
A: Most work is done outside service hours, for example on Sunday, followed by ventilation until safe before the next day's opening. The exact time depends on floor area.

Q: What should we do with consumables whose boxes got wet?
A: Decide according to the clinic's quality policy and the manufacturer's advice. The team can help with advice on separating stock and controlling humidity.

Q: Can you include the clinic toilet?
A: Yes. Toilets are a key risk point, especially in clinics that collect urine specimens, and should always be part of the disinfection plan.

Q: Do you also work with larger labs or hospital outpatient areas?
A: Yes. The same approach can be scaled up for larger laboratories, collection centers and outpatient waiting areas, with zoning planned around service hours and infection control requirements.

Q: Which areas do you serve?
A: Dusit, Bang Sue, Phaya Thai, Ratchathewi, Phra Nakhon and other areas of Bangkok and its vicinity. Ask us on LINE @whd268.

Make your clinic a place clients trust again

Book a site survey for your medical technology clinic or lab in Dusit and Bangkok.

View Disinfection Service – Click Here

Book Ozone Treatment – Click Here

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

Related links

• Ozone treatment for odor and chemical residue
• Chemgene HLD4H disinfectant spray
• Master Ozone Generator
• All articles

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