Intellectual – Behavioural Intelligence · Editorial

By Moakanyi Magazine · June 2026

A malaria control programme can have the right chemicals, the right teams and the right timing, and still fail at the front door. In March 2023, as cases rose, some residents refused indoor residual spraying, the household-level intervention that breaks transmission by killing mosquitoes where they rest. The gap was not in the science. It was in the trust, and trust is the one input a procurement budget cannot order in bulk.

Indoor residual spraying works only at coverage. A treated house beside an untreated one leaves a corridor for the mosquito and the parasite. Refusals do not just expose the household that declines; they thin the protective effect across a whole settlement, because the method depends on denying the insect resting places at scale rather than dwelling by dwelling. That is why public confidence is not a soft factor in malaria control. It is the operating condition.

The Trust Deficit: Misinformation Moves Faster Than Teams

When residents turn spray teams away, the usual driver is not indifference but doubt, rumours about the chemical, its safety, its purpose, or simply unease at strangers treating the inside of a home. Misinformation travels household to household quicker than any campaign can correct it, and a single bad story can close a street to a programme that depends on near-total coverage.

The economics of that are unforgiving. A spray round is a fixed operational cost whether coverage lands at fifty percent or ninety, but the public-health return is not linear: below a threshold, transmission simply continues and the spend is largely wasted. Refusals therefore do not trim the programme at the margin; past a point, they undo it.

In malaria control, the unsprayed house is everyone's exposure, not just its own.

The Moving Target: Climate Widens the Map

The refusals matter more because the risk is no longer where it used to be. Climate change is shifting the conditions that let mosquitoes breed and survive, spreading malaria risk into areas and seasons that may have known it less before. A programme already losing coverage to distrust now has more ground to cover, and less of it carries the lived memory of malaria that once made households cooperate without persuasion.

For Botswana, where transmission has historically concentrated in the wetter north around Ngamiland, the Okavango and Chobe, a widening risk map raises the cost of every refusal. Districts with thinner recent experience of malaria are exactly where rumour fills the gap that familiarity once closed, and exactly where teams arrive as outsiders rather than as a known annual visit.

A widening risk map turns yesterday's low-risk district into tomorrow's front line.

The Operator's Cost: Where Outbreaks Land First

Public-health failure is rarely confined to the clinic. A malaria season that runs unchecked pulls workers off shift, thins attendance in schools and offices, and lands first on the labour-intensive sectors that cannot easily cover absences, tourism lodges in the Okavango and Chobe, farms at Pandamatenga, the seasonal operations that depend on a healthy local workforce arriving each morning.

For employers in the north, that makes spraying coverage a business input, not only a health statistic. A workforce that refuses the spray team at home carries the exposure to the workplace, and the cost of a thin programme is paid partly in productivity that never shows up on a health ledger. Operators have a direct interest in the trust-building that lifts coverage, and a standing to help fund it.

An uncontrolled malaria season is absenteeism the spreadsheet did not forecast.

The lesson sits underneath the spray schedule. Botswana's malaria response can buy the chemicals and field the teams, but the decisive intervention is the conversation at the door, conducted early, in plain terms, by people the household already trusts: local leaders, clinic staff, neighbours. Coverage is won socially before it is won chemically, and the budget that funds the spray needs a line for the trust-building that makes it land.

Sources: allAfrica