The True Story: The Virus Arrived Before the Patients

On 4 October 2026, the Seoul Institute of Health and Environment said flu season had started early, with cases rising from late August, three weeks earlier than last year, and wastewater monitoring detected the virus in late July, six weeks earlier than last year. The circulating strain was influenza A (H1N1).

The Korea Disease Control and Prevention Agency issued an influenza epidemic advisory on 11 September 2026 and began free vaccination for children, pregnant women and people aged 65 and over on 21 September. Park Jusung, head of the institute, urged vaccination, handwashing and masks.

The Key Lesson: The Virus Is in the Community Before We See Patients

Condominiums house hundreds of families who share common areas. Points to watch are:

• Lifts and buttons everyone touches many times a day
• Gyms and pools with equipment used in turn
• Lobbies and parcel rooms busy all day
• Residents' meeting rooms and co-working spaces that are closed
• Units changing tenants or after someone recovers

How Flu Spreads

According to the World Health Organization, seasonal influenza spreads easily where people gather, such as schools and nursing homes. It spreads through droplets when people cough or sneeze, and through hands that touch contaminated surfaces and then the eyes, nose or mouth. Most people recover within a week, but young children, older adults, pregnant women and people with chronic illness are at risk of severe disease. Influenza is an enveloped virus, which suitable disinfectants can inactivate.

Risk Register for Condominiums

1. Lift buttons wiped once a day: likelihood high / impact low / level medium. Mitigation: wipe buttons and rails every two hours at morning and evening peaks. Owner: condo juristic person
2. Gym equipment not wiped after use: likelihood high / impact medium / level high. Mitigation: provide disinfectant and wipes for before and after use. Owner: gym manager
3. Crowded parcel room: likelihood medium / impact low / level low. Mitigation: wipe the counter and provide sanitiser. Owner: juristic staff
4. Closed co-working rooms: likelihood medium / impact medium / level medium. Mitigation: ventilate and ozone-treat on a schedule. Owner: condo juristic person
5. Units not disinfected between tenants: likelihood medium / impact medium / level medium. Mitigation: fog and ozone-treat units before new tenants. Owner: owner or agent

Ways to Reduce Flu Risk in Condos

1. Wipe lift buttons and rails several times a day
2. Install hand sanitiser at lifts on every floor
3. Provide disinfectant wipes in the gym
4. Share prevention tips in the residents' LINE group
5. Ventilate common rooms
6. Fog common areas on a schedule
7. Ozone-treat units between tenants or after illness

How ULV Disinfection Fogging Helps

The World Health Disinfection disinfection service uses ULV fogging machines that turn the disinfectant into a fine mist. It settles across the whole area, including corners, curtains, upholstery and surfaces that hand wiping cannot reach.

• Whole-area coverage without relying on wiping spot by spot
• Quick return to use, typically about 30 minutes after fogging
• Uses Chemgene HLD4H, which meets EN 14476 for virucidal activity according to the product page
• The team wears full protective equipment, so owners and staff do not take the risk themselves
• Report and photos after the job for customers, management or authorities
• Tax invoice with 3% withholding tax for companies and agencies

Ozone Treatment for Closed Rooms and Stuffy Spaces

The World Health Disinfection ozone treatment service uses machines that generate ozone gas from oxygen in the air. It suits closed rooms such as meeting rooms, bedrooms, classrooms, sick bays and vans, helping reduce germs in the air and on surfaces and removing stale odours. Ozone breaks back down into oxygen after treatment, leaving no residue.

• Works alongside disinfection fogging: spray or wipe surfaces first, then use ozone for the air and corners of closed rooms
• No people or pets in the room during treatment: the team seals the room and runs a timer
• Ventilate after treatment before normal use resumes
• Machines tested by Intertek, according to WHD's service page
• Ideal after someone has been ill, such as recovered patients' rooms, shared bedrooms and shuttle vans

Before and After

Frequently Asked Questions

Q: Why does wastewater testing matter? A: Seoul detected the virus in wastewater six weeks before cases rose, showing it spreads in the community before people fall ill.

Q: What should management do when residents fall ill? A: Ask them to wear masks in common areas, wipe lifts more often, and offer ozone treatment of the unit after recovery.

Q: Does the fogging disinfectant work on flu? A: The team uses Chemgene HLD4H, which meets EN 14476 for virucidal activity according to the product page, and influenza is an enveloped virus that suitable disinfectants can inactivate. Fogging does not replace vaccination or handwashing.

Q: Can I enter the room right after ozone treatment? A: No one should be in the room during treatment. Ventilate afterwards before normal use; the team will advise the right time for the room size.

Q: Can condo juristic persons get a tax invoice? A: Yes. Tax invoices are issued and 3% withholding tax is supported. Call 065-556-6294 or LINE @whd268.

Related Links and Sources

• World Health Disinfection disinfection service
• World Health Disinfection ozone treatment service
• Chemgene HLD4H disinfectant and price
• Influenza information from Thailand's Department of Disease Control, hotline 1422
• WHO seasonal influenza fact sheet

Prevent Flu with Disinfection Fogging and Ozone Treatment

The true story from Seoul shows the virus arrives before the patients. Condos that prepare from the start of the season protect every family. Reduce the risk with the World Health Disinfection disinfection service for lobbies, lifts, gyms and common areas, and the ozone treatment service for units and co-working rooms. To book, call 065-556-6294 or LINE @whd268.

Call 065-556-6294 | LINE: @whd268