The True Story: More Severely Ill Children Every Day

Vietnam's SGGP reported on 10 November 2025 that Hanoi hospitals were admitting 10–20 children a day with influenza A and the tropical diseases centre was treating about 80 children, most severe, some with complications such as pneumonia, respiratory failure, encephalitis and myocarditis.

The report said Hanoi recorded 280 flu cases in the first week of November, with 65 hospitalised. Dr Do Thien Hai, deputy director of the tropical diseases centre, advised parents to seek care when a child has persistent high fever, fast breathing or drowsiness.

The Key Lesson: Students from Many Countries Bring Viruses from Many Seasons

Thai international schools have students and teachers who travel abroad often and many extracurricular activities. Points to watch are:

• Students returning from abroad after holidays
• AC classrooms used all day
• Sports and music activities in close contact
• School buffet canteens
• School buses collecting from many estates

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 International Schools

1. Students return from abroad with symptoms: likelihood medium / impact high / level high. Mitigation: screen after holidays and keep the sick home. Owner: school nurse
2. AC classrooms all day: likelihood high / impact medium / level high. Mitigation: check ventilation and filters. Owner: facilities
3. Shared buffet tongs: likelihood high / impact medium / level high. Mitigation: staff serve or change tongs in rounds. Owner: catering
4. Parents unaware of danger signs: likelihood medium / impact high / level high. Mitigation: send information on urgent symptoms. Owner: school nurse
5. Classrooms not disinfected when many are ill: likelihood medium / impact high / level high. Mitigation: fog and ozone-treat classrooms at weekends. Owner: operations director

Ways to Reduce Flu Risk in International Schools

1. Screen symptoms after holidays
2. Run on-site vaccination
3. Share danger signs with parents
4. Check classroom ventilation
5. Have staff serve food instead of self-service
6. Wipe sports equipment and instruments
7. Fog and ozone-treat classrooms at weekends

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 many children were Hanoi hospitals admitting? A: 10–20 a day, with about 80 under treatment at the tropical diseases centre, most severe.

Q: When should children see a doctor? A: With persistent high fever, fast breathing or drowsiness, per Hanoi doctors.

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 international 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 real news from Vietnam shows flu in children can be severe. Schools that prevent proactively keep every student safe. Reduce the risk with the World Health Disinfection disinfection service for classrooms, canteens and gyms, and the ozone treatment service for AC classrooms and sick rooms at weekends. To book, call 065-556-6294 or LINE @whd268.

Call 065-556-6294 | LINE: @whd268