The True Story: Back to School, Along with the Virus

VietnamPlus (VNA) reported on 15 October 2026 that Ho Chi Minh City recorded 34,664 acute respiratory infections in the first week of October, more than 64% above the previous four-week average, which experts linked to seasonal weather changes and students returning to school.

The Ho Chi Minh City Centre for Disease Control (HCDC), sampling at 29 facilities, found 151 influenza-positive samples in one week, with A/H1N1pdm09 nearly 77%. HCDC advised handwashing, covering coughs, masks when symptomatic and annual vaccination.

The Key Lesson: Thousands of Students Change Rooms Every Hour

Thai universities bring students from every region together in shared lecture buildings. Points to watch are:

• Large lecture halls with hundreds seated close
• Lecture building lifts at class changes
• Libraries and reading rooms with AC all day
• Central canteens at noon
• Sick students attending for fear of attendance penalties

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 Universities and Lecture Buildings

1. Sick students attend for attendance: likelihood high / impact high / level critical. Mitigation: excuse attendance with notice of illness. Owner: dean
2. Crowded lecture halls: likelihood high / impact medium / level high. Mitigation: parallel online lectures in outbreaks. Owner: academic affairs
3. Packed lifts at class change: likelihood high / impact medium / level high. Mitigation: wipe buttons hourly and encourage stairs. Owner: facilities
4. Libraries with AC all day: likelihood medium / impact medium / level medium. Mitigation: check ventilation and change filters. Owner: facilities
5. Classrooms not disinfected: likelihood medium / impact high / level high. Mitigation: fog and ozone-treat classrooms in term breaks. Owner: facilities

Ways to Reduce Flu Risk at Universities

1. Excuse attendance for sick students
2. Offer parallel online lectures in outbreaks
3. Wipe lift buttons hourly
4. Place hand gel on every floor
5. Check library ventilation
6. Run vaccine drives at the campus clinic
7. Fog and ozone-treat classrooms in breaks

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: How much did HCMC infections rise? A: 34,664 in the first week of October 2026, more than 64% above the previous four-week average.

Q: Which flu strain led in HCMC? A: A/H1N1pdm09, nearly 77% of positive samples.

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 universities 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 real news from Vietnam shows the new term brings viruses with students. Prepared universities keep learning on track. Reduce the risk with the World Health Disinfection disinfection service for lecture halls, lifts and canteens, and the ozone treatment service for AC classrooms and libraries in term breaks. To book, call 065-556-6294 or LINE @whd268.

Call 065-556-6294 | LINE: @whd268