A Municipality Recorded 214 Dengue Cases in One Rainy Season Because Only 2 of Its 6 Foggers Actually Worked
Last updated: 7 Sep 2026 | 7 Views |
A true story from a sub-district municipality in north-eastern Thailand
A Municipality Recorded 214 Dengue Cases in One Rainy Season Because Only 2 of Its 6 Foggers Actually Worked
When the cheapest equipment purchased becomes the most expensive thing you own, and the case count is the price the community pays
A sub-district municipality in north-eastern Thailand recorded 214 confirmed dengue cases in a single rainy season, its worst in ten years — despite having both budget and staff. The real cause was that of six thermal foggers on the asset register, only two actually worked. Here is the procurement problem local authorities across the country share, and how the AIROFOG AT35 changed the outcome.
Somchai, 46, directs the public health and environment division of a sub-district municipality serving about 14,000 people across 12 villages. Eighteen years in the role and several dengue seasons behind him — but last rainy season was the worst he had seen.
Confirmed cases within the municipality reached 214. Sixty-eight required hospital admission, and there was one death: a nine-year-old girl. Somchai says he went to the funeral and then sat alone in his office until dark.
What he found on review was that the municipality lacked neither budget nor staff. What it lacked was equipment that worked. Six thermal foggers were listed on the asset register. When he walked to the store and checked them, only two would start and fog properly.
Six machines on the register, two that worked
Somchai went to the equipment store with the procurement officer and the municipal technician and inspected all six foggers one by one. What they found explained the entire season within a single morning.
Machines one and two, bought four years earlier, had coated-metal bodies corroded through in several places by store humidity and by chemical exposure. They started but leaked when running — unusable. Machines three and four, bought three years earlier, had internal faults with no parts available, because the supplier had gone out of business.
Machines five and six, bought last year, still worked well. But two machines had to cover 12 villages across tens of square kilometres. The team had to choose which village to reach first, which in practice meant some villages waited more than two weeks after a case was reported.
The procurement officer explained it plainly. Past purchases had been decided principally on lowest price, which is correct under the regulations, but the result was cheap machines with short service lives — and on a whole-of-life cost basis, several times more expensive than a higher-priced machine.
Why a two-week delay changes everything
The hospital's epidemiologist explained it to the municipal team in simple numbers. Aedes goes from egg to adult in about seven to ten days in hot, humid conditions — meaning that in two weeks the mosquito population can add an entire new generation.
The control standard requires fogging within a 100-metre radius of a patient's home within 24 hours of notification, and again on day seven, to break the cycle of both infected adults and the generation about to emerge. Fog later than that and infected mosquitoes have already bitten several neighbours.
In this municipality, having only two machines meant the team reached patients' homes an average of five to nine days after notification, and almost never managed the day-seven repeat, because they were already running to the next case.
The consequence shows in the weekly case curve: instead of controllable point outbreaks, it became continuous spread from one village to the next across four months.
The true cost of buying cheap equipment
Somchai prepared a whole-of-life cost comparison for the municipal executive. Across the four cheap machines, the actual usable life averaged just over two years each. On a cost-per-year basis, that was clearly higher than a quality machine lasting eight to ten years.
He also included the costs nobody counts: repairs paid for that did not work, travel to source parts, staff time lost to repairs and waiting on parts, and above all the days during the rainy season with no machine available — precisely when it is needed most.
The figure that silenced the room was the treatment cost of 214 patients borne by the health system, plus the income families lost taking time off to care for them — together several times the cost of a complete set of quality foggers.
But the number Somchai says can never be calculated is the life of that nine-year-old girl. And that, he says, is why he will not compromise on equipment quality again.
A new procurement round with a specification written from experience
When the next budget cycle came, Somchai rewrote the equipment request entirely, this time specifying characteristics drawn from actual experience rather than copying the previous specification.
The first thing he specified was body material. He required stainless steel, on the documented grounds that storage and operating conditions involve high humidity and constant chemical contact — the reason the previous machines corroded within three to four years.
Second was warranty and the existence of a service centre and genuine parts within Thailand, requiring bidders to evidence the service centre location and the parts held in stock, so that the machines could never again become scrap the moment a supplier closed.
Third was reference to the government standard equipment schedule, which makes budgeting and acceptance inspection straightforward. And last was a quantity matched to the actual area: one machine per two villages, six in total, plus one spare. The municipality selected the AIROFOG AT35 in that round.
What it actually costs
The lives and health of the community
Two hundred and fourteen confirmed cases, 68 admissions and one death is a figure no budget can compensate for. Dengue in children carries a high risk of shock syndrome, and slower access to care in outlying areas compounds it.
Accountability and public confidence in local government
When a serious outbreak occurs, residents ask the municipality directly what it was doing — and explaining that the machines were broken is not an answer the public accepts. Lost confidence affects every other area of local government work.
Budget already spent with no result
Four cheap machines averaging just over two years of usable life produced a far higher cost per year than quality equipment would have, and every baht spent on repairs that did not work was money gone with nothing returned.
The burden on a small team
A municipal public health division has only a handful of staff. When the equipment is not ready, they spend their time on repairs, waiting for parts, and deciding which village to reach first, instead of running the control programme as planned.
Why the usual fixes do not work
Procuring principally on lowest price
Correct under the regulations, but it produces the most expensive long-run outcome, because cheap machines use materials that do not resist humidity and chemicals and rarely come with a stable service network. On a cost-per-year basis over the real service life, they cost considerably more.
Continuing to repair the old machines
A body corroded through is difficult to restore, and once the supplier has closed there are no genuine parts. Substitute parts leave the machine off-specification and potentially unsafe for the operator, and accumulated repair costs usually exceed the price of a new machine.
Waiting for provincial-level support
Provincial agencies have limited resources across many districts. Waiting typically takes longer than the outbreak season you need to manage, and supported equipment often comes with conditions about sharing across areas.
Relying on container-emptying campaigns alone
Source reduction is the heart of long-term control and must continue. But once cases exist, fogging is needed immediately to remove infected adults. Campaigns alone do not stop transmission already under way.
Contracting private spraying during outbreaks
The per-visit cost is very high multiplied by the number of cases requiring the standard two applications each, and contractors generally cannot arrive within the 24 hours the standard requires — which is the most important condition of all.
Local authorities need working machines in numbers matched to the area
The heart of local dengue control is speed. The standard requires fogging within 24 hours of notification and again on day seven, which is only possible with machines that genuinely work, in numbers matched to the villages you must cover.
A thermal fogger is the principal tool for this work, because the fog drifts into homes, under raised floors, into shrubbery, material piles and still corners where mosquitoes rest — the places that must be treated to break transmission within 100 metres of a patient's home.
What local authorities need to change is how they think about procurement: from lowest price on the day of purchase to whole-of-life cost, weighing body material, the existence of a domestic service centre and genuine parts, and a warranty that can be verified.
A machine that meets this needs a body that resists humidity and chemicals, a stable service network in Thailand, and conformity with the government standard equipment schedule so budgeting and acceptance are straightforward. That is why this municipality chose the AIROFOG AT35.
10 reasons the AIROFOG AT35 thermal fogger solves it
1. Compliant with Thailand's government standard equipment schedule
For municipalities, sub-district administrations and other local authorities, the AIROFOG AT35's conformity with the standard equipment schedule means the budget request and reference price sit correctly within the category, and acceptance inspection requires no reinterpretation — substantially reducing the risk of challenge.
2. A 100 percent stainless steel body — the fix for the failure local authorities see most
The leading cause of premature failure in local government foggers is body corrosion from store humidity and chemical contact. A fully stainless body addresses that at the root, multiplying service life and clearly lowering cost per year.
3. A Thai service centre with genuine parts and 10-plus years of technician experience
What turns local government equipment into scrap is a supplier who closes and leaves no parts. A stable domestic service network and genuine parts should therefore be a stated procurement criterion — and it is an area where AIROFOG is demonstrably prepared.
4. Light enough for officers and village health volunteers to use
Community fogging means walking into lanes, into houses, up steps and across ground no vehicle can reach. The AT35 is a light shoulder-carried unit that officers and village health volunteers can carry through a full application round without running out of strength.
5. Runs both water-based and oil-based formulations
The Department of Disease Control advises rotating products to slow Aedes resistance, and different areas call for different chemistry. Accepting both formulation types lets a local authority follow that guidance rather than being locked to a single product.
6. Certified to German and British standards
Certification means the machine has been tested for safety and droplet-size consistency, which matters greatly when fogging communities with residents nearby, and it is information that can be cited in the procurement evaluation.
7. 100 percent quality control before dispatch
Every unit is run-tested before shipping, which matters greatly for government acceptance inspection and gives the authority confidence that every machine is ready from day one — rather than discovering a fault on the day of an actual response.
8. Covers the standard 100-metre radius quickly
The control standard requires treating a 100-metre radius around a patient's home. The AT35's output lets a single officer cover that area quickly, so one team can reach several locations in a day when multiple cases are reported.
9. Built for heavy continuous use through the rainy season
The rainy season means near-daily use for four to five consecutive months. Machines designed for light duty begin failing within the first season. The AT35 is built for continuous operation, which is exactly what local disease control work demands.
10. Better value on a whole-of-life basis
Comparing cost per year between a cheap machine lasting two to three years and a quality machine lasting eight to ten reverses the arithmetic entirely. That is the analysis to include in the memorandum to the executive explaining why the specification is written as it is.
Before the thermal fogger
- 214 confirmed cases, 68 hospital admissions, one death
- Six foggers on the register, only two actually usable
- An average of 5 to 9 days from notification to fogging
- The standard day-seven repeat application almost never achieved
- Old machines corroded, with no parts available after the supplier closed
- Residents asking the municipality what it was actually doing
After the thermal fogger
- Case numbers down significantly the following rainy season
- Six working machines plus one spare
- Fogging within 24 hours of notification for almost every case
- The day-seven repeat achieved in most cases
- A domestic service centre and genuine parts, as required in the specification
- Case-by-case fogging records available for provincial reporting
The three-step process
1. Inspect the equipment you actually have before requesting budget
Walk the store and inspect every machine with the procurement officer and technician. Record the actual condition, the cause of failure, the real service life achieved, and whether parts can be sourced. That record is the strongest possible justification for the new specification.
2. Write the specification from experience, not by copying the old one
Specify body material that resists humidity and chemicals; require bidders to evidence a domestic service centre and genuine parts stock; reference the standard equipment schedule for clarity in budgeting and acceptance; and set a quantity matched to the number of villages you must cover.
3. Build the fogging and record-keeping system to meet the standard
Fog within a 100-metre radius of a patient's home within 24 hours of notification, and repeat on day seven, logging date, time, area, product and operator every time — alongside regular larval index surveys in the villages.
From someone who uses one
undefined
undefined — undefined
How to write an equipment request that actually delivers usable machines
The problem local authorities across the country share is that procurement specifications are copied forward without ever being updated from experience, producing equipment that satisfies the wording but not the need. The fix starts with documenting the condition of the existing assets in detail, as the justification.
The characteristics worth specifying, each with a stated reason, are: body material that resists humidity and chemicals; a tank capacity suited to the standard application radius; a weight an operator can carry through a full round; and the ability to run both water-based and oil-based formulations.
After-sales conditions deserve the clearest wording of all, because this is where local government equipment most often becomes scrap. Require bidders to evidence a service centre location within the country, the parts held in stock, the warranty period, and operator training for your staff.
Finally, reference the government standard equipment schedule. It gives the reference price and acceptance inspection a clear basis, reduces the risk of challenge, and speeds the process considerably — which matters when the equipment has to arrive before the rainy season.
What to do alongside fogging, so you are not fogging forever
Thermal fogging removes infected adult mosquitoes immediately, which is essential once cases exist. But if the breeding sites remain, a new generation replaces them within seven to ten days. Local authorities that control dengue well always do both.
Source surveys and elimination by village health volunteers is the mechanism that works best over the long run, using the larval index as a measure that can be repeated monthly and reported back to the community to build participation.
In rural areas the priority sites are old tyres, uncovered water jars, plant saucers, garden water containers, cut bamboo sections and pools on vacant land. In town they are air-conditioner drip trays, blocked gutters and containers in abandoned houses.
Communicating through schools, temples and older residents' groups works far better than posted notices. And when the community sees that the municipality has working equipment and is genuinely operating, cooperation on source reduction improves markedly.
Frequently asked questions
How many machines should a municipality of my size have?
A workable rule is one machine per two villages or communities, plus at least one spare, so the team can meet the 24-hour standard even when several cases are notified at once. Very large areas or difficult travel warrant more.
Why specify body material?
Because it is the leading cause of premature failure in local government foggers. Most equipment stores are humid, and the machine is in constant contact with chemicals. A body that does not resist those conditions corrodes within three to four years — far short of what it should achieve.
When and how often does the standard require fogging?
The disease control standard requires fogging within a 100-metre radius of a patient's home within 24 hours of notification, and a repeat application on day seven, to break the cycle of both infected adults and the generation about to emerge.
Can village health volunteers operate the machine?
Yes, with full training on mixing ratios, personal protective equipment, correct application technique, and cleaning the machine after every use. Many municipalities run annual training and assign trained volunteers as the responsible operator for each village.
Which budget category should this sit in?
The equipment category, referencing the government standard equipment schedule, which already lists thermal foggers — so the reference price and acceptance inspection need no reinterpretation. Chemicals and fuel go under materials as usual.
Should we buy the full set at once or phase it?
Buy the full required quantity at once if at all possible, because having too few machines means missing the standard response time, which reduces the effectiveness of the whole programme. Phasing one or two machines a year usually leaves a control gap for several years.
What if a machine fails mid-season?
AIROFOG maintains a service centre and genuine parts in Thailand with technicians of more than 10 years' experience, so repairs are fast. Municipalities are advised to hold the common wear parts locally and keep at least one spare machine so control work never stops.
Is operator training provided?
Yes. The World Health Disinfection team has delivered equipment to many government agencies and provides training on operation, maintenance and safety for officers and village health volunteers, and can help prepare the supporting procurement documentation.
We were not short of budget. We were short of machines that worked
Somchai's sentence captures the problem local authorities across the country face: many have both budget and staff, and what they lack is equipment that is ready on the day it is needed.
Procuring on lowest price on the day of purchase is correct under the regulations but produces the most expensive long-run outcome — and the real price is not paid from the budget. It is paid in the community's case numbers.
Writing a specification grounded in real experience, with justifications that can be defended and reference to the standard equipment schedule, is therefore the most powerful tool a local health officer has for making next season's numbers different from this one's.
Talk to the World Health Disinfection team about procuring thermal foggers for your municipality or sub-district administration — specification guidance, machine numbers, and operator training.
See the machine and pricing — click here
Call 065-556-6294 or add LINE @whd268
#ThermalFogger #AIROFOGAT35 #LocalGovernment #DengueControl #PublicHealth #GovernmentProcurement #WorldHealthDisinfection
Related keywords: thermal fogger, municipal equipment, local government procurement, AIROFOG AT35, dengue control, standard equipment schedule
Related content
