A typical scenario (an illustrative situation, not the story of any particular pharmacy or clinic)

The pharmacy the whole soi relies on had to keep its shutters down on the day the community needed it most

Pharmacist May has run a pharmacy in a two-unit shophouse on a lane near Si Burapha Road for almost ten years. Most of her customers are older residents collecting regular blood-pressure and diabetes medicines, young mothers buying formula and children's fever syrup, and commuters grabbing plasters and painkillers on the way to the bus. Next door is a small evening clinic run by a local doctor. Together, these two shopfronts have always been the neighbourhood's first line of healthcare.

In late September 2026, according to news reports, around 300 millimetres of rain fell in roughly 48 hours. On 26 September the Bangkok Metropolitan Administration declared all 50 districts a disaster zone. The eastern side of the city was hit hardest, and even after the rain stopped, Governor Chadchart said the canals were full and drainage would take another two to three days. As of 30 September, news reports said some roads, including Si Burapha and Lat Phrao, still had 20 to 40 centimetres of water.

Water came about a foot deep into May's shop. The entire bottom row of shelves, with children's syrups, cough medicines, gauze, cotton wool and dressing kits, sat in murky brown water for hours. The power was out for most of the night, and the refrigerator for temperature-sensitive medicines went silent. A thin film of mud lay across the tiles in front of the counter, and the smell of drains drifted in through the back door. The clinic next door was no better: the vinyl examination couch, the stainless instrument trolley, the scales and the front row of waiting chairs had all been under water halfway up their legs.

From the morning the water began to fall, people knocked on the shutters asking for medicine. Some had feet softened and cracked from days of wading. Some had cuts from broken glass hidden in the water. Some had diarrhoea; others had fever and aching muscles. May wanted to reopen as quickly as possible, but as a pharmacist she knew a pharmacy or clinic must be cleaner than an ordinary home, because the people who walk in are already unwell or have open wounds. Opening while surfaces were still contaminated by floodwater could mean passing germs from one patient to the next without meaning to.

This guide is written for pharmacy owners, pharmacists, doctors and nurses in community clinics, dental and physiotherapy clinics, and other small healthcare premises in Bangkok that need to reopen after the flood. It covers the right order of work, how to handle stock that touched floodwater, and how to disinfect surfaces with Chemgene HLD4H, a medical-grade disinfectant already used in hospitals and clinics.

Why clinics and pharmacies need a higher standard of cleaning after a flood

Even in normal times, clinics and pharmacies bring people with many different illnesses together in small spaces. After a flood, the picture becomes more complicated in two ways. First, the premises themselves are contaminated by floodwater carrying sewage, waste and mud. Second, the people coming through the door change: there are suddenly more infected wounds, more diarrhoea, more fevers, more skin problems and more respiratory illness, all at once.

Who tends to come in after a flood

• Infected wounds and cuts from glass, nails and debris in the water. Wounds soaked in floodwater carry a high risk of bacterial infection.
• Immersion foot and fungal skin infections after long hours in water. Softened, broken skin lets both bacteria and fungi in.
• Diarrhoea and food poisoning from contaminated drinking water and food, commonly linked to gut bacteria, Salmonella and norovirus.
• Influenza and RSV, which surge in the rainy season and can hit older people and young children hard.
• Suspected leptospirosis: high fever, headache, calf pain and red eyes after wading. These patients need prompt assessment and treatment by a doctor.
• People with chronic illnesses who have run out of medicine because supplies at home were ruined or they cannot reach their usual hospital.

Germs that may linger on surfaces in small healthcare premises

When many patient groups share one space, frequently touched surfaces become a bridge for infection: the dispensing counter, the card terminal, the pen for signing, chair armrests, blood-pressure cuffs, scales, the examination couch, wheelchair handles and the toilet door handle. The organisms to consider therefore include bacteria from sewage, gut viruses such as norovirus, respiratory viruses such as influenza and RSV, mould that thrives in damp conditions, and mycobacteria associated with tuberculosis patients who may share the waiting area with others.

Vulnerable people walk into clinics every day

Older adults, people with diabetes whose wounds heal slowly, kidney patients, people on chemotherapy, pregnant women and young children are the regular customers of community clinics and pharmacies. If they pick up a second infection, they tend to become more seriously ill than others. Cleanliness of the premises is therefore part of patient care, not just appearance.

What is at stake if a clinic or pharmacy reopens without thorough disinfection

Patient safety

A patient with an open wound having a dressing changed on a couch that is still contaminated, an immunocompromised patient waiting on a chair that sat in floodwater, a toddler touching the counter and then their mouth: these are all realistic situations in the first days after the water recedes. Healthcare premises have a duty to reduce that risk as far as possible.

Business continuity

Most community clinics and pharmacies are small businesses whose income comes from regular customers within a few kilometres. Every closed day is lost income while rent and wages continue. Reopening quickly matters, but reopening before you are ready and then having to close again because of a hygiene problem is far more costly.

Stock and equipment costs

Medicines and supplies that touched floodwater must be discarded, which is a direct loss. If cleaning products corrode stainless equipment, trolleys or metal shelving, the damage spreads to assets that were otherwise fine. According to a Thai business report, the Chamber of Commerce estimated damage from this flood at around 12,300 million baht, so small neighbourhood businesses need to protect every asset they still have.

Reputation and trust

Neighbours remember which shops opened to help in hard times and which kept things clean. Word of mouth in the soi and in village LINE groups is powerful, for better or worse. A pharmacy that explains how it cleaned and disinfected with a medical-grade product earns trust back faster.

Staff safety

Pharmacists, assistants, nurses and doctors have more patient contact than anyone during this period. If the workplace is still contaminated, staff can fall ill themselves, and when one person in a small team is off sick, the shop may have to close.

Why familiar cleaning habits may fall short in healthcare premises after a flood

1. Wiping alcohol over surfaces that still carry mud. Alcohol works well on surfaces that are already clean, but silt and organic matter reduce its effectiveness considerably, and it evaporates so fast that the contact time may not be enough.

2. Using strong bleach on everything. Bleach corrodes stainless steel, instrument trays, couch frames and metal parts. It can make vinyl couch covers brittle and crack, and its fumes bother patients with asthma and COPD who are sitting in the waiting area.

3. Wiping wet medicine boxes and putting them back on sale. This is the most dangerous mistake of all. Cardboard packaging and bottle caps do not reliably keep out contaminated water. Medicines and supplies that touched floodwater should be removed from sale and handled according to the guidance of the relevant authorities, never wiped and resold.

4. Using the medicine fridge again without assessment. Temperature-sensitive products such as vaccines and insulin may lose quality after a long power cut. Check temperature records and the manufacturer's guidance before deciding whether they can still be used.

5. Cleaning only the front of the shop. The back room, stock storage, toilet and floor drains are often overlooked, even though that is where sewage backs up first and where damp lingers longest.

6. Spraying and wiping immediately. Every disinfectant needs the contact time on its label. Rushing to wipe surfaces dry so you can open sooner means the product will not perform as tested.

7. Mixing several cleaners together. In a hurry, people sometimes combine toilet cleaner, bleach and floor cleaner hoping for something stronger, which can release dangerous gases. Use a single product designed for the job and follow its label.

Chemgene HLD4H: a high-level disinfectant already at home in hospitals and clinics

CHEMGENE HLD4H is a medical-grade high-level disinfectant made in England. According to the product information, it is used in hospitals, clinics and laboratories, the same kind of environment community clinics and pharmacies need to recreate.

What healthcare staff should know

• The product information lists activity against bacteria, fungi, mycobacteria, Salmonella and viruses including influenza H1N1, RSV, norovirus, hand, foot and mouth disease virus and SARS-CoV-2.
• The product page states a 1-minute kill time, 99.85% efficacy against COVID-19 and residual surface protection for up to 14 days.
• Dilutions of 1:30, 1:50, 1:60, 1:100 and up to 1:200 can be chosen to match the risk level of each area according to the label.
• It is non-corrosive to stainless steel, aluminium, rubber, plastic and fibreglass; the page states it is safe for people, pets and medical equipment when used as directed; and it is biodegradable.
• Listed tests and approvals include Mahidol University, NHS England, ISO 9001:2015, ISO 13485 (quality management for medical devices), SGS, Intertek, CE and the European standards EN 13727 (bacteria), EN 14348 (mycobacteria), EN 13624 (fungi) and EN 14476 (viruses).

Please note: in this article Chemgene HLD4H is recommended for disinfecting surfaces and non-critical equipment that contacts intact skin after a flood. Instruments that enter sterile tissue, such as minor surgical or certain dental instruments, must always be sterilised according to your facility's protocol and the instrument manufacturer's instructions.

Recovery order for a clinic or pharmacy, in three zones

Back zone (storage, toilet, drains). Start with the dirtiest area so you do not track mud back into finished spaces.

Clinical zone (examination, dressing and injection rooms). High-risk areas; use the stronger dilution on the label.

Front zone (counter, waiting area, entrance). Do this last, because it is the route the team walks through all day.

1. Safety first. Cut the power and have an electrician check the system, especially the medicine fridge and electrical equipment. Wear boots, heavy rubber gloves, a mask and eye protection.
2. Triage the stock. Separate all medicines and supplies that touched floodwater. Photograph them, list them and store them apart for disposal under the relevant guidance. Assess refrigerated products using temperature records and the manufacturer's advice.
3. Remove absorbent materials such as privacy curtains, torn foam cushions, cardboard boxes and wet files.
4. Wash off mud with clean water and detergent. Scrub floors, lower walls, couch and shelf legs, corners and the rolling-shutter track.
5. Dry. Open doors and windows; use fans and a dehumidifier if available.
6. Disinfect with Chemgene HLD4H. Dilute according to the label, spray or wipe all cleaned surfaces, and leave for the contact time.
7. Disinfect non-critical equipment such as the examination couch, plastic blood-pressure cuffs, scales, wheelchairs and trolleys, following each equipment manufacturer's guidance.
8. Inspect and record the date, dilution, area and person responsible, and keep before-and-after photos.
9. Set a daily routine after reopening. Wipe high-touch points through the day and disinfect the couch between patients.

10 reasons community clinics and pharmacies choose Chemgene HLD4H after a flood

1. It is genuinely medical grade. A high-level disinfectant used in hospitals and clinics, not a household cleaner pressed into service. See the Chemgene HLD4H product page.
2. Standards clinicians recognise. EN 13727, EN 14348, EN 13624 and EN 14476 are listed, covering bacteria, mycobacteria, fungi and viruses.
3. It covers the mix of patients sharing one waiting room, from gut pathogens such as Salmonella and norovirus to respiratory viruses such as H1N1 and RSV.
4. It works fast between patients. The product page states a 1-minute kill time, keeping turnaround short when patients are queuing.
5. It keeps protecting. The page states residual surface protection for up to 14 days, an extra layer while post-flood patients keep coming.
6. It is gentle on stainless steel and rubber, so trolleys, trays, shelving, couch frames and rubber parts are not corroded.
7. ISO 13485 is listed, the quality-management standard associated with medical devices. See the certificates page.
8. Less reliance on strong bleach, whose fumes trouble respiratory patients and staff working all day. The page states it is safe for people when used as directed.
9. It is economical for small businesses, diluting up to 1:200 for routine wipe-downs and stronger only where risk is high.
10. It works for both recovery and everyday use. Start on clean-up day and keep it as your main disinfectant afterwards. Order at Chemgene HLD4H.

Before and after: a clinic or pharmacy restored systematically

Example case: a shophouse clinic near Khlong Chan reopens within two days

Example case (an illustrative scenario explaining the process, not a review from a specific customer)

Dr Ton runs an evening general clinic in a shophouse near Khlong Chan with one nurse and one assistant. Water rose a little over a hand-span inside, and the back examination room flooded completely. His main concern was that people nearby urgently needed the clinic: patients with wounds, patients with diarrhoea, and older residents who had lost their medicines.

Day one, morning. The team of three put on protective gear, cut the power and had an electrician check the system. Then they triaged supplies. Every medicine and pack of gauze from the lower cabinets was set aside, listed and photographed. Privacy curtains were taken down for a hot wash, and wet patient files were moved to a dry area so records could be backed up first.

Day one, afternoon. They washed mud out from back to front, scrubbing couch legs, chair legs, the stainless trolley base and the rolling-shutter track, then left fans running overnight to dry the space.

Day two. With the floor dry, the team mixed Chemgene HLD4H according to the label, using a stronger dilution in the toilet and examination room. They sprayed floors, lower walls, the couch, trolleys, scales, plastic blood-pressure cuffs, wheelchair handles and the counter, and left everything for the contact time. Dressing instruments that must be sterile went through the clinic's usual sterilisation process. That evening the clinic saw its first patient, and the nurse wiped the couch with disinfectant between every patient.

What this example delivered was confidence for both the team and the patients. Dr Ton put a small sign on the counter explaining that the clinic had been restored and disinfected with a medical-grade product, and asking anyone with high fever and calf pain after wading through water to tell the nurse straight away.

Flood recovery checklist for clinics and pharmacies

Before you start

• Cut the power and have the electrics, medicine fridge and air conditioning checked.
• Provide boots, heavy rubber gloves, masks and eye protection; cover any cuts.
• Photograph all damage for insurance and accounting.

Medicines and supplies

• Remove all medicines, supplies and dressing materials that touched floodwater; never resell them.
• Assess temperature-controlled products against temperature records and manufacturer guidance.
• Check upper shelves that stayed dry for damp or mould on packaging.

Spaces and surfaces

• Always remove mud and dry before disinfecting.
• Disinfect the counter, card terminal, chair armrests, door handles and light switches.
• Disinfect the couch, scales, blood-pressure cuffs, wheelchairs and trolleys.
• Disinfect the toilet, taps, basins and drain covers at the label's high-risk dilution.
• Check walls behind shelving and under the counter for mould.

After reopening

• Wipe the couch and patient-contact equipment between every patient.
• Place hand gel at the entrance and counter; space out waiting chairs where possible.
• Set aside a waiting area for people with fever or cough and offer masks.
• Advise anyone with high fever, calf pain or an inflamed wound after wading to see a doctor promptly.

Frequently asked questions about disinfecting clinics and pharmacies after a flood

The box got wet but the blister pack inside looks fine. Can I still sell it?

This is not recommended. All medicines and supplies that touched floodwater should be taken off sale, because there is no way to be sure contaminated water did not reach the product or inner packaging. List them and handle them according to the guidance of the relevant authorities.

Can Chemgene HLD4H be used on a vinyl examination couch?

According to the product information, it is non-corrosive to plastic, rubber, stainless steel and aluminium, and is stated to be safe for medical equipment when used as directed. For upholstery, check the couch manufacturer's guidance and test a small area first.

Can Chemgene HLD4H replace sterilisation of instruments?

No. Instruments that enter sterile tissue must always be sterilised according to your facility's standards. In this article Chemgene HLD4H is recommended for surfaces and non-critical equipment.

What dilution should we use in the examination room?

Chemgene HLD4H can be diluted from 1:30 to 1:200. Follow the label and the supplier's advice. Generally, high-risk areas and surfaces that touched sewage use a stronger dilution than routine wipe-downs. If unsure, contact the WHD team.

Can it be used while patients are waiting?

The product page states it is safe for people when used as directed, so routine wiping of touch points during the day is fine. The major disinfection during recovery is best done while closed, with good ventilation.

Our pharmacy did not flood, but customers wade in. What should we do?

Even without water inside, shoes and clothing bring in mud. Mop the entrance more often and disinfect the counter and touch points several times a day during this period.

An assistant who helped clear the mud now has a fever. What should they do?

Stop work and see a doctor promptly, mentioning the flood exposure, especially with high fever, calf pain or red eyes, which may indicate leptospirosis. Disinfectants are for surfaces, not for treating illness.

Let your clinic or pharmacy be your community's safe place again

The World Health Disinfection team can advise on dilutions for each zone, how much product your premises need, and a disinfection routine after reopening.

Order Chemgene HLD4H for Clinics and Pharmacies

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

Related pages

• Chemgene HLD4H medical-grade disinfectant
• Disinfection service for buildings and businesses
• Test certificates
• Contact us

References

• 2026 Bangkok floods (Wikipedia)
• Al Jazeera: Disaster zone declared across Bangkok
• CDC: Floods
• WHO fact sheets