The True Story: Macau's Flu Surges Early in the Season

The Macau Daily Times reported on 22 October 2025, citing the Health Bureau, that September saw 1,073 flu cases, up 74.2% from 616 in August and 6.4 times September 2024. Strains detected were H1N1, H3N2 and influenza B.

Positivity from 5 to 11 October was 12.2%, close to the 13.1% alert level, and emergency visits at Conde S. Januário and Kiang Wu hospitals rose, suggesting an early peak.

The Key Lesson: Large Closed Halls, Large Crowds

Entertainment complexes, integrated resorts and convention centres in Thailand have people coming and going 24 hours a day in large air-conditioned halls.

• Open 24 hours with no downtime, so clean zone by zone
• Chips, cards, machine buttons and rails are many shared touch points
• Front-line staff meet hundreds of guests per shift and should be vaccinated
• The season can peak early, so follow surveillance data
• Staff rest rooms and staff dormitories are often-forgotten spread points

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 Entertainment Complexes and Integrated Resorts

1. Front-line staff infected by guests: likelihood high / impact high / level critical. Mitigation: Vaccination, masks during outbreaks and staying home with fever. Owner: HR
2. Shared rails, buttons and equipment: likelihood high / impact medium / level high. Mitigation: Scheduled wiping and zone-by-zone fogging. Owner: Housekeeping
3. Crowded staff dormitories: likelihood medium / impact high / level high. Mitigation: Fog dorms and isolate sick staff. Owner: Staff welfare
4. Guest rooms after sick guests: likelihood medium / impact medium / level medium. Mitigation: Ozone-treat before new guests. Owner: Executive housekeeper
5. Stuffy staff rest rooms: likelihood medium / impact medium / level medium. Mitigation: Ozone-treat outside break times and ventilate. Owner: Facilities

7 Steps to Manage Flu in Large Entertainment Complexes

1. Track weekly surveillance data to see the peak coming
2. Hold a staff vaccination day before the season
3. Place hand gel at every entrance and activity zone
4. Fog zone by zone at each zone's quietest time
5. Fog staff dormitories and isolate sick staff
6. Ozone-treat guest rooms after sick guests and staff rest rooms
7. Wipe shared touch points on a fixed 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: How can a 24-hour venue be fogged? A: Zone by zone at quiet times; areas are typically usable about 30 minutes later.

Q: How often should staff dorms be fogged? A: During outbreaks or when several staff are ill, fog at once and wipe touch points daily.

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 a company 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
• Influenza information from Thailand's Department of Disease Control, hotline 1422
• WHO seasonal influenza fact sheet

Prevent Flu with Disinfection Fogging and Ozone Treatment

Macau shows flu can multiply in crowded cities, so large entertainment complexes need proactive cleaning plans. Reduce the risk with the World Health Disinfection disinfection service for activity zones, lobbies and staff dormitories, and the ozone treatment service for guest rooms and staff rest rooms. To book, call 065-556-6294 or LINE @whd268.

Call 065-556-6294 | LINE: @whd268