A Real Study: A Home Sampled 15 Days After the Patient Left

In July 2021, researchers in the United States sampled a one-bedroom residence in Dallas, Texas, occupied by a man with travel-associated mpox. Sampling took place 15 days after the patient had left for hospital. The findings were published in Emerging Infectious Diseases, the US CDC journal, in October 2022. Source: Emerging Infectious Diseases, US CDC

The results matter to anyone with a room to rent:

• 27 of 31 samples (87%) tested positive for viral DNA by PCR.
• Porous and nonporous materials were positive at similar rates, around 90%.
• 7 of 31 samples (23%) yielded viable virus in culture.
• Porous materials such as bedding, towels and clothing produced viable virus in 6 of 10 samples, compared with 1 of 21 nonporous samples.
• Most culture-positive samples had very low amounts of virus.

The researchers concluded that household disinfection is recommended for any home occupied by a person with confirmed mpox, using a registered disinfectant with an emerging viral pathogen claim, following the manufacturer's instructions, and taking special care with bedding, clothing and towels.

How Long Can the Virus Survive on Surfaces?

A separate study from Ruhr University Bochum in Germany, published in the Journal of Infectious Diseases, tested the virus on stainless steel at different temperatures. Source: HealthDay summary of the study

• Room temperature (22°C): infectious virus persisted for about 10 to 11 days.
• Cold (4°C): up to 30 days.
• 37°C: no replicating virus was detected after 6 to 7 days.

Many condos and rental rooms in Thailand keep the air conditioning running, so indoor temperatures sit close to the 22°C used in the study. The researchers also found that different disinfectants performed differently, which is why choosing a product with proven virucidal activity and following its label matters.

The Situation in Thailand

According to the DDC, Thailand recorded 470 mpox cases and 3 deaths in 2026 up to 31 October. Source: Hfocus, 3 Nov 2026

The DDC advises confirmed patients to isolate at home, avoid travel and use separate personal items until lesions heal, scabs fall off and new skin forms. That means many patients spend extended time in their own condo, rental room or dormitory while they have lesions.

When that tenant moves out or the lease ends, the landlord may never know there was a patient in the room, and neither will the next tenant.

The Risks Landlords and Dormitory Managers Face

• Housekeepers clearing the room handle mattresses, sheets and curtains directly.
• New tenants move into a room that has not been properly disinfected.
• Furnished mattresses and sofas, where the research found porous materials held more viable virus.
• Complaints and reputational damage if a new tenant later learns about a previous case.
• Rumours in the building that make other units harder to rent.

What Many People Do, and Why It Is Not Enough

• Leaving the room closed for a few days and assuming the virus will die. Research suggests it can last longer than that in an air-conditioned room.
• Routine cleaning with sweeping and dry dusting, which the US CDC advises against because it can stir up virus-containing dust. Source: US CDC
• Shaking out sheets before sending them to the laundry.
• Using products with no virucidal claim, or wiping them off before the contact time is up.
• Forgetting the insides of wardrobes and drawers the patient used.

Preparing a Room for the Next Tenant

1. If you know there was a patient, plan a full disinfection without disclosing the previous tenant's identity.
2. Equip housekeepers with gloves, a well-fitting mask or N95 and long sleeves, as the CDC recommends.
3. Handle fabrics first. Bag sheets, pillowcases, blankets, towels and curtains without shaking them, then machine-wash with detergent.
4. Mattresses and sofas: steam-clean them, and consider replacing heavily contaminated items.
5. Disinfect every hard surface: handles, switches, remotes, counters, taps, toilets and the insides of wardrobes and drawers, with a product labeled to kill viruses and its full contact time.
6. Mop floors wet, or use a vacuum with a high-efficiency filter.
7. Have professionals disinfect the whole room to reach corners that wiping misses.
8. Record the date and what was done, for transparency with the new tenant.

Why Landlords Choose Chemgene and WHD's Disinfection Service

The mpox virus is an enveloped virus, the type that suitable disinfectants can inactivate when used correctly and given the full contact time.

World Health Disinfection provides spraying with CHEMGENE HLD4H, a concentrated disinfectant imported from the United Kingdom. According to our service page, the product references testing to the European virucidal standard EN 14476 and is applied with ULV equipment that produces a fine mist, for homes and condominiums alike. See the disinfection service

Ten reasons it suits landlords, condos and dormitories:

1. Rooms ready to hand over quickly. Under our service process, rooms can be used about 30 minutes after spraying.
2. No need to put housekeepers at risk in a room known to have housed a patient.
3. ULV mist reaches hidden areas, inside wardrobes, under beds and behind furniture.
4. European-standard disinfectant, referencing EN 14476 per product information.
5. Suited to air-conditioned rooms, where research shows the virus can survive for days.
6. Confidential, with no disclosure of the previous tenant's information.
7. A standard for every tenant change, reassuring every new tenant.
8. Many rooms in one day for dormitories and apartment buildings.
9. Tax invoices and 3% withholding tax for juristic persons.
10. More than five years of experience.

Before and After

Before

• The room is empty, but nobody is sure it is safe.
• Housekeepers are reluctant to go in.
• Mattresses, curtains and sofas have not been dealt with.
• There is no record of cleaning to show the next tenant.

After

• Every fabric has been handled correctly and mattresses cleaned.
• Hard surfaces and the whole room have been disinfected.
• There is a record of what was done.
• The room is ready for a new tenant to move in with confidence.

Make It the Building Standard

Many dormitory owners and building managers now make disinfection a routine step at every tenant change, not only when they know about a case. The benefits:

• No unit is singled out, so there is no stigma.
• Every tenant receives the same standard.
• It becomes a selling point at a time when tenants care about hygiene.
• It also reduces the risk from other diseases that spread through surfaces.

Frequently Asked Questions

If the room has been closed for two weeks, do we still need to disinfect? The Dallas study sampled 15 days after the patient left and still found viable virus in some fabrics, so cleaning and disinfection before handover is advisable.

Do we need to replace the mattress? Not always. Steam cleaning can work, but the US CDC says heavily contaminated items may need replacing.

Should we tell the new tenant? Do not disclose the previous tenant's health information, but you can say the room has been cleaned and disinfected to a professional standard.

How long does it take? A typical room does not take long, and under our service process it can be used about 30 minutes after spraying.

Sources and Related Links

• WHD disinfection spraying service
• Chemgene disinfectants
• World Health Disinfection homepage
• Emerging Infectious Diseases: Mpox virus on surfaces in a patient's home
• US CDC: Cleaning and disinfecting for mpox

A Truly Clean Room Is a Disinfected Room

Real research shows mpox virus can remain on surfaces and in fabrics for days after a patient has left. Landlords, condo owners and dormitory managers who disinfect before handover protect their staff, their new tenants and their building's reputation.

World Health Disinfection provides CHEMGENE HLD4H disinfection for rental rooms, condos, apartments and dormitories of every size.

Call 065-556-6294 or add LINE @whd268 for a quotation.

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