The True Story: H1N1 Dominated Almost All Cases in October

On 5 November 2026, Dr Adisorn Wattanasak, Director-General of the Department of Medical Sciences, released surveillance results from the National Influenza Center. From January to October 2026, 8,734 samples were tested and 1,278 were flu-positive. In October alone, 122 samples were positive, and 115 of them, or 94.26%, were A(H1N1)pdm09.

The department said subclade 6B.1A.5a.2a.1 had grown clearly since June, and no mutations indicating antiviral resistance had been found. It urged good personal hygiene and close adherence to public health advice.

The Key Lesson: One Dominant Strain Means Fast Spread

When one strain dominates, offices with shared spaces should watch these points:

• Closed meeting rooms where people sit close for hours
• Keyboards, mice and desk phones on shared desks
• Lifts, pantries and water dispensers everyone touches daily
• A culture of working while sick that spreads infection across the team
• Closed air-conditioning with little fresh air

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 Offices

1. Staff with fever still come in: likelihood high / impact high / level critical. Mitigation: work-from-home policy when sick without using leave. Owner: HR manager
2. Meeting rooms not disinfected between sessions: likelihood high / impact medium / level high. Mitigation: wipe tables and equipment after meetings and use ozone on closed rooms on a schedule. Owner: facilities team
3. Shared desks never wiped: likelihood high / impact medium / level high. Mitigation: provide wipes at each desk and wipe before use. Owner: team lead
4. Shared touch points wiped once a day: likelihood high / impact low / level medium. Mitigation: more wiping rounds for lifts, handles and pantries. Owner: housekeeper
5. No plan when a team member falls ill: likelihood medium / impact medium / level medium. Mitigation: procedure to fog the work area after a case. Owner: office manager

Ways to Reduce Flu Risk in Offices

1. Let staff with fever work from home
2. Wear masks when coughing or sneezing
3. Wipe keyboards, mice and phones every morning
4. Add wiping rounds for shared points lifts, handles, pantries
5. Ventilate meeting rooms between sessions
6. Encourage annual flu vaccination for all staff
7. Fog and use ozone after a case or on a schedule

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: Which flu strain dominated in Thailand in October 2026? A: A(H1N1)pdm09, found in 115 of 122 positive samples (94.26%), according to the Department of Medical Sciences.

Q: Is this H1N1 drug-resistant? A: The department said no mutations indicating antiviral resistance had been found.

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 companies 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 the Department of Medical Sciences shows H1N1 is dominating. Prepared offices cut sick days and keep work moving. Reduce the risk with the World Health Disinfection disinfection service for work areas, lifts and pantries, and the ozone treatment service for meeting rooms and closed offices. To book, call 065-556-6294 or LINE @whd268.

Call 065-556-6294 | LINE: @whd268