The True Story: Influenza B Dominates, 16 Deaths

On 30 May 2026, Dr Montien Kanasawat, Director-General of Thailand's Department of Disease Control, reported 171,731 flu cases and 16 deaths from 1 January to 28 May 2026, with influenza B the most widespread strain.

The department named closed and crowded places, such as schools, other educational institutions, workplaces and public transport, as key transmission hotspots, and expected cases to rise further in the rainy season, the annual peak.

The Key Lesson: Crowded Classrooms Are Transmission Hotspots

Tutoring schools bring students from many schools together in several sessions a day. Points to watch are:

• Packed air-conditioned classrooms for 2–3 hours per session
• Desks and chairs reused every session without wiping
• Teachers' microphones and remotes passed around
• Restrooms and water dispensers crowded at changeovers
• Sick students afraid of missing content who still attend

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 Tutoring Schools

1. Sick students attend for fear of missing lessons: likelihood high / impact high / level critical. Mitigation: offer recordings or online classes when sick. Owner: centre manager
2. Desks not wiped between sessions: likelihood high / impact medium / level high. Mitigation: wipe desks and armrests at every class change. Owner: housekeeper
3. Closed classrooms: likelihood high / impact medium / level high. Mitigation: ventilate between sessions and ozone-treat rooms after classes. Owner: facilities team
4. Shared microphones not wiped: likelihood medium / impact low / level low. Mitigation: wipe mics and use replaceable foam covers. Owner: teacher
5. No procedure when several students fall ill: likelihood medium / impact medium / level medium. Mitigation: notify parents and fog the classroom at once. Owner: centre manager

Ways to Reduce Flu Risk in Tutoring Schools

1. Let sick students learn online instead of attending
2. Check temperatures at classroom doors
3. Wipe desks and chairs at every class change
4. Ventilate between sessions
5. Install hand sanitiser outside every room
6. Encourage vaccination before the rainy season
7. Fog and ozone-treat classrooms after classes end

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 was most common in Thailand in early 2026? A: The DDC reported in May 2026 that influenza B was the most common.

Q: Who is at risk of severe illness? A: Young children, older adults, pregnant women and people with chronic illness; complications can include pneumonia.

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 tutoring schools 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 DDC shows crowded schools are transmission hotspots. Tutoring schools that manage classrooms systematically keep students learning without whole classes falling ill. Reduce the risk with the World Health Disinfection disinfection service for classrooms, restrooms and common areas, and the ozone treatment service for air-conditioned classrooms after hours. To book, call 065-556-6294 or LINE @whd268.

Call 065-556-6294 | LINE: @whd268