10 Things a Public Health Division Director Must Prepare Before the 2027 (B.E. 2570) Rainy Season: A Checklist for Mosquito Foggers, Teams, Chemicals and Case Response, Featuring the SOLO PORT423 Backpack Sprayer

The 2027 rainy season, B.E. 2570 in the Thai calendar, is only months away, and every year the same lessons return. The mosquito fogger stored all through the dry season will not start. Chemicals have expired. New staff have never held a machine. The case response plan exists only in the heads of a few people. This guide gathers ten things a local public health and environment division director should finish before the first rains, with a timeline you can forward to your team today.

Executive summary (1-minute read)

• The problem: Aedes mosquitoes multiply quickly at the start of the rainy season, yet many agencies only start checking machines, ordering chemicals and training staff after cases appear, so their response is slow.
• The fix: A ten-point checklist covering machines, spare parts, chemicals, teams, protective equipment, risk maps, coordination, community campaigns, a written case response plan, and budget and record-keeping.
• Timeline: Start at the beginning of fiscal year 2570 (October 2026) and finish everything before the rainy season, which usually begins around mid-May.
• Recommended tool: the SOLO PORT423 backpack ULV mosquito sprayer, which sprays up to 12 meters from a 12-liter tank, ideal for rapid-response teams around patients' homes.
• Next step: Send the checklist to your team leaders, assign an owner to each item, and contact WHD at 065-556-6294 or LINE @whd268 for machine checks, parts and quotations.

The first rain came, but the machines were not ready (illustrative scenario)

Somsak directs the public health and environment division of a town municipality in northern Thailand. Last year the rains came earlier than expected. In late May, the local health promoting hospital reported the year's first dengue case in a canal-side community. The team opened the equipment store. The sprayer that had been stored since the end of the previous season would not start because fuel had sat in the system for months. A second machine had cracked hoses. The leftover chemicals were close to expiry.

Repairs and a new chemical order took several days. Meanwhile, second and third cases appeared in nearby lanes. Two newly transferred staff had never used a sprayer and had to learn on the job. Residents posted in the community chat group that they had reported the problem days ago and nobody had come. The complaint reached the mayor before the team made its first spraying run.

After the season, Somsak told his team that none of this came from laziness or lack of commitment. It came from having no clear readiness list saying what must be done, by whom and by when. This year he decided to start in October, at the beginning of fiscal year 2570. That experience is the origin of the ten-point checklist below.

What unpreparedness costs

1. Public health

The Aedes mosquito carries dengue, chikungunya and Zika. Dengue patients have a high, persistent fever, headache and muscle pain; some develop bleeding spots, and shock can occur around the time the fever falls. Children, older people, those with chronic illness and pregnant women need special care. In forest and border areas, Anopheles mosquitoes also carry malaria. Every day that spraying around a patient's home is delayed gives mosquitoes that have bitten the patient a chance to spread infection further.

2. Budget

Emergency repairs mid-outbreak, urgent chemical orders and heavy overtime usually cost more than planning ahead. Rushed government procurement also increases the risk of documentation errors that may surface later in an audit.

3. Image and public trust

The start of the rainy season is when residents watch most closely. If the first case of the year gets a slow response, the whole year's image is judged by that moment. A fast response from the very first case builds trust that improves community cooperation for the rest of the season.

4. Staff workload

Without preparation, staff juggle repairs, chemical requests and spraying at the same time. Stress and fatigue build from the first week, raising the risk of accidents and unintended chemical exposure.

Why traditional preparation falls short

• Storing machines without draining fuel or cleaning: engines stored for months with fuel inside often start poorly or develop fuel-system blockages.
• Waiting for a case before checking equipment: problems found on the day of use leave no time to fix them.
• Old machines without spare parts: long waits for parts or improvised repairs that compromise performance and safety.
• Unsuitable droplet size: large droplets fall quickly and never reach mosquitoes, so spraying seems not to work and must be repeated.
• Wrong timing: short of staff and working machines, teams spray when convenient rather than at dawn or dusk when mosquitoes feed.
• Cheap equipment without after-sales service: low-cost machines with no local technicians may take a long time to repair, or cannot be repaired at all.

Key terms in one line each

• ULV: Ultra Low Volume, spraying a small amount of liquid as very fine droplets for good coverage with less chemical; a ULV cold fogger works this way.
• Micron: one thousandth of a millimeter, used to describe droplet size.
• Thermal fogging machine: uses heat to turn liquid into a dense, visible fog; best outdoors.
• SRRT: Thailand's Surveillance and Rapid Response Teams, which investigate and control outbreaks when cases occur.
• Village health volunteers: community volunteers who survey larvae and communicate with residents.

The checklist: 10 things to prepare before the 2027 rainy season

1. Inspect every mosquito fogger

List every machine you own: thermal foggers, backpack ULV sprayers and electric units. Start each one and spray plain water. Check hoses, tanks, nozzles, fuel systems and spark plugs. Sort machines into three groups: ready, needs repair, and should be retired. Send repairs out while there is no urgent work. Target: done by December 2026.

2. Stock spare parts and consumables

From the inspection, list fast-wearing parts such as spark plugs, filters, hoses, gaskets and nozzle parts, and order them from a supplier with genuine parts in Thailand. Parts on the shelf mean basic repairs can be done in a day instead of waiting several days mid-outbreak. Target: ordered by January 2027.

3. Check and stock chemicals

Check expiry dates, chemical types and storage conditions of what remains. Consult local health authorities on recommended chemicals so you can rotate chemical groups and reduce resistance. Estimate quantities from last year's spraying data and complete procurement before the rains. Store chemicals in a dry, ventilated place away from heat. Target: delivered by April 2027.

4. Build and train the team

List all operators, including permanent staff, contract workers and volunteers. Form sub-teams with leaders. Train on machine operation, chemical mixing, basic maintenance and safety, especially for new staff. Training should include hands-on practice with the agency's own machines, not just lectures. Target: completed by March 2027.

5. Provide personal protective equipment

Check the quantity and condition of chemical respirators, goggles, gloves, coveralls and hearing protection, with enough for every operator plus spares. Good protection reduces health risks to staff and shows residents that the agency works to a proper standard. Target: complete by March 2027.

6. Map risk areas from past data

Request past dengue case data from the local health center or district health office. Map communities with repeat cases, combined with volunteer larval surveys, standing water, markets, schools, child development centers and dense neighborhoods. Use the map to prioritize pre-season campaigns and deploy teams. Target: done by February 2027.

7. Agree on coordination and case notification channels

Agree with health centers, local hospitals, the district health office and the SRRT on how cases will be reported to your division, who receives the report and within how many hours. Share an emergency contact list with all parties. Clear channels remove the time lost passing information along. Target: agreed by March 2027.

8. Plan breeding-source campaigns with the community

Spraying reduces adult mosquitoes, but without removing larvae they return. Plan campaigns around the Department of Disease Control's "3 Keeps" approach: keep the house tidy, keep rubbish managed and keep water containers covered, working with volunteers, schools, temples and community leaders. Schedule a major pre-season campaign alongside targeted spraying in high-risk areas. Target: major campaign in April to early May 2027.

9. Write the case response plan down

Describe each step from receiving a case report, confirming the address and notifying neighbors, to spraying within about 100 meters of the patient's home, surveying and removing larvae, and repeat spraying according to health authority guidance. State who does what, which machine is used and the target response time. A written plan lets the team act even when the supervisor is away. Target: signed off by executives by April 2027.

10. Review budget, equipment and record-keeping

Check whether the fiscal year 2570 budget covers chemicals, protective equipment, maintenance and necessary equipment. If machines are insufficient or old units should be replaced, consult finance and procurement staff on what is possible under your agency's rules and prepare a case for executives. At the same time, prepare a per-round spraying record form capturing date, time, place, chemical and response time from the first round of the season. Target: budget review by November 2026; record form ready by April 2027.

Readiness timeline, October 2026 to May 2027 (ready to forward)

Note: rainy season onset varies by region. The southern Gulf coast has its heaviest rain late in the year, so adjust the timeline to local weather and Thai Meteorological Department announcements.

Short on time? Do these first

1. First, items 1 and 3: machines must start and chemicals must be on hand. Without these, nothing else matters.
2. Second, items 7 and 9: agree on notification channels and write a one-page response plan so everyone knows what to do when the first case appears.
3. Third, items 4 and 5: a half-day crash course for staff who have never used a machine, and a full check of protective equipment.
4. Fourth, items 6 and 8: use last year's case data to pick the two or three highest-risk communities and campaign there with volunteers first.
5. Last, items 2 and 10: stock the most critical parts and start the record form from the first round. Use this season's data for next year's budget and equipment review.

Whatever your starting point, print the ten items on a single page, write an owner and a date next to each one, and pin it where the team meets every week. Review it in a short standing meeting, even ten minutes is enough, and mark each item only when it is truly finished, not when it has merely started. A visible checklist turns preparation from a vague intention into shared, trackable work, and it gives the director a simple way to report readiness to executives before the first rain. It also creates a record that next year's team can reuse, so the agency does not have to rebuild its preparation from memory every season.

The core tool for rapid-response teams: SOLO PORT423

The SOLO PORT423 is a backpack ULV sprayer powered by a SOLO engine with MAHLE and BING parts. It sprays up to 12 meters, has a 12-liter tank, and is designed to help reduce chemical use. It is supplied and supported by WHD, which operates under ISO and GMP, checks 100% of machines before delivery, provides technicians, spare parts and full after-sales service, and supplies products that meet Thai government equipment standards.

In pre-season preparation, a backpack unit is the machine rapid-response teams use most, because it moves easily through narrow lanes, over fences and into backyards vehicles cannot reach. The long reach lets staff treat shrubs, spaces under raised houses and fence lines from the path. The 12-liter tank allows longer continuous work without frequent refills, while quality engine parts and local spares make items 1 and 2 of the checklist straightforward.

For wide outdoor areas, pair it with the AIROFOG AT35 thermal fogger. For indoor work in schools or child development centers, add the battery-powered AIROFOG AIROSTAR.

10 reasons the SOLO PORT423 belongs in your 2027 readiness plan

1. Agile in tight spaces: a backpack unit reaches lanes and backyards that vehicles cannot.
2. Up to 12 meters of reach: treats shrubs, under-house spaces and fence lines from the path.
3. 12-liter tank: continuous work around a patient's home with fewer trips to refill.
4. Helps reduce chemical use: the ULV system is designed for efficient chemical use, stretching the chemical budget from item 3.
5. SOLO engine with MAHLE and BING parts: components from well-known manufacturers for heavy rainy-season use.
6. Built for case response: fits the roughly 100-meter spraying guidance in your item 9 plan.
7. For disease control and insect control: usable against many target pests depending on the chemical chosen.
8. Local technicians and parts: easy pre-season servicing.
9. Quality-checked before delivery: WHD inspects every machine, backed by ISO and GMP.
10. Expandable into a kit: pairs with the AT35 for outdoor fogging and vehicle-mounted units for wide areas, as your mission grows.

What leaders gain

• Citizen trust: a fast response to the year's first case.
• Fewer complaints: visible pre-season campaigns.
• Visible results: a plan, a timeline and records that can be presented.
• Budget used wisely: fewer emergency repairs and rushed purchases.
• Audit-ready procurement: planned purchasing with complete documents.

For the public health team (technical notes)

• Off-season storage: drain fuel or run the engine dry as the manufacturer advises, rinse tanks and nozzles, and store in a dry place.
• Pre-use testing: spray plain water to check flow and droplet pattern before adding chemicals.
• Spraying window: early morning and evening when Aedes mosquitoes feed; avoid strong wind, rain and harsh sun.
• Around patients' homes: cover roughly 100 meters, together with larval surveys and source removal in and around the patient's home.
• Chemical rotation: consult health authorities on suitable chemical groups for your area to reduce resistance.
• Safety: full protective equipment, advance notice to residents, food covered and pets removed before spraying.

Procurement tips before the rainy season

• Start early: buying equipment and chemicals takes time, so begin in the first or second quarter of the fiscal year to receive items before the rains.
• Specify by mission: for example, a backpack ULV unit with stated spray distance, tank size and ULV system, without locking in a brand.
• Require after-sales support: warranty, training, spare parts and a technician contact.
• Include training in delivery: ask the supplier to train the actual team at delivery or before the season.
• Budget operating costs: chemicals, protective equipment, fuel and maintenance alongside the equipment itself.

Example field perspective

"In past years we only started thinking about our mosquito foggers after the first case. This year we pinned the checklist in the meeting room with a name next to every item. By December we knew which machines needed repair. In March the new staff practiced with the backpack sprayers. When the first case came, we sprayed on the same day we were notified. Our executives were relieved, and residents could see we were ready."

(A composite perspective based on common experiences of local disease control teams, not a statement by any specific person or agency.)

Three next steps

1. Call or LINE for a quotation and specifications: for the SOLO PORT423, spare parts or pre-season machine checks, at 065-556-6294 or LINE @whd268.
2. Request a demonstration or training: schedule team and volunteer training before April 2027.
3. Budget and procure by the rules: check your FY2570 budget items and follow your agency's procurement process.

Frequently asked questions

Q: When does the 2027 rainy season start?
A: Thailand's rainy season usually begins around mid-May, but timing varies by year and region. Follow the Thai Meteorological Department and finish preparations before then.

Q: What if we did not budget for new equipment in fiscal year 2570?
A: Consult finance and procurement staff on the options available under your agency's rules. Meanwhile, focus on servicing existing machines and preparing a needs case for executives.

Q: How does a backpack ULV sprayer differ from a thermal fogger?
A: A ULV cold fogger produces very fine droplets without smoke, while a thermal fogging machine uses heat to create dense fog. Both work outdoors, and many agencies use them together.

Q: How far does the SOLO PORT423 spray?
A: According to the product information, up to 12 meters, with a 12-liter tank.

Q: Should we rehearse the case response plan?
A: Yes, at least once before the season, from receiving the report and preparing machines to spraying a mock area, to find bottlenecks.

Q: Is spraying enough on its own?
A: No. Spraying reduces adult mosquitoes, but it must be combined with breeding-source removal under the "3 Keeps" approach and good communication with residents.

Q: Can it be used against other insects?
A: Yes, against many insects depending on the chemical. Use products labeled for the target pest and always follow the label.

Start preparing your rapid-response team for the 2027 rainy season today

SOLO PORT423 backpack ULV sprayer: 12-meter reach, 12-liter tank, with technicians, parts and after-sales service from WHD.

See SOLO PORT423 details and price, click here

Call 065-556-6294 · LINE @whd268

See all government mosquito control equipment

World Health Disinfection Co., Ltd. · 88 268 Kanlapaphruek Road, Bang Khae, Bangkok 10160 · worldhealthdisinfection@gmail.com

Related links

• Government mosquito and insect control equipment hub
• AIROFOG AT35 thermal fogger
• SUPER ROTARY backpack ULV sprayer
• Department of Disease Control, Thailand
• WHO: Dengue and severe dengue

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