The True Story: 130 Absent in Two Days

The Boston Globe reported on 10 December 2025 that Roberts Elementary School in Medford, Massachusetts would close on 11 December 2025 after more than 130 students were out sick in a suspected norovirus outbreak.

The school scheduled a professional cleaning company, and local health officials planned to inspect cafeteria equipment to rule out other causes. Anyone vomiting was advised to wait a full day before returning.

The Key Lesson: The Kitchen Must Always Be in the Plan

Central kitchens and canteens in Thai schools feed hundreds of children a day. The lessons are:

• When many children fall ill at once, check the kitchen to rule out causes
• Kitchen staff with symptoms must stay off work
• Kitchen equipment and trays must be washed and disinfected properly
• Professional teams clean more thoroughly
• Children who vomited should rest before returning

How Germs Spread Through Surfaces

According to the US Centers for Disease Control and Prevention (CDC), norovirus spreads through sick people, food and contaminated surfaces. After vomiting or diarrhoea, clean and disinfect the entire area immediately with a 1,000 to 5,000 ppm chlorine bleach solution or a disinfectant with a norovirus claim, leaving it on for at least 5 minutes. For hand, foot and mouth disease, Thailand's Department of Disease Control advises cleaning classrooms, toilets and toys with suitable products such as disinfectant or diluted bleach.

Risk Register for School Kitchens and Canteens

1. Kitchen staff working while ill: likelihood medium / impact high / level high. Mitigation: Stay-off policy for diarrhoea and vomiting. Owner: Head cook
2. Equipment and food trays: likelihood medium / impact high / level high. Mitigation: Wash and disinfect by procedure. Owner: Catering
3. Canteen tables used in several sittings: likelihood high / impact medium / level high. Mitigation: Clean between sittings. Owner: Housekeeping
4. Children vomiting in the canteen: likelihood medium / impact high / level high. Mitigation: Vomit kit and cordon. Owner: Duty teacher
5. In-house cleaning incomplete: likelihood medium / impact medium / level medium. Mitigation: Hire a professional germ elimination team. Owner: Facilities

7 Steps for School Kitchen and Canteen Germ Control

1. Keep kitchen staff with symptoms off work as health officials advise
2. Check and clean kitchen equipment: fridges, counters and trays
3. Choose products per CDC guidance, such as bleach or a product with a norovirus claim
4. Wipe canteen tables between sittings
5. ULV-fog the canteen; areas are usable about 30 minutes later
6. Ozone-treat closed dry stores with nobody inside, then ventilate
7. Wash hands with soap and water; alcohol gel does not kill norovirus

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 check the kitchen when many children fall ill? A: To rule out other causes such as food, as Medford officials planned by inspecting cafeteria equipment.

Q: When can the canteen reopen after fogging? A: After ULV fogging, areas are typically usable about 30 minutes later.

Q: What disinfectant does the germ elimination service use? A: The team chooses products by germ and setting, including Chemgene HLD4H, which meets EN 14476 according to the product page. For norovirus, the CDC recommends chlorine bleach or a disinfectant with a norovirus claim; ask the team to choose the right product for the job.

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

Q: Can schools get a tax invoice with 3% withholding? 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
• Communicable disease information from Thailand's Department of Disease Control, hotline 1422
• CDC guidance on cleaning to prevent norovirus

Eliminate Germs with Disinfection Fogging and Ozone Treatment

Medford called professionals and checked the kitchen at the same time, a thorough approach for schools with their own kitchens. Reduce the risk with the World Health Disinfection disinfection service for kitchens, canteens and classrooms, and the ozone treatment service for dry stores and kitchen staff rooms. To book, call 065-556-6294 or LINE @whd268.

Call 065-556-6294 | LINE: @whd268