A mixed-methods study of the scale-up and delivery of Seasonal Malaria Chemoprevention in pastoralist communities of northwest Kenya

A mixed-methods study in northwest Kenya demonstrates that Seasonal Malaria Chemoprevention is feasible and highly effective in pastoralist communities when delivered via door-to-door campaigns leveraging trusted Community Health Promoters, achieving 97% initial coverage and 71% full adherence despite challenges related to wealth and mobility.

The Gist

Imagine a vast, dusty landscape in northwest Kenya called Turkana. The people who live there are pastoralists, which means they are like modern-day nomads. Instead of staying in one house, they move their families and herds of cattle across the land to find water and grass, much like a flock of sheep following a shepherd.

This movement makes it very hard for doctors to reach them with medicine. But there's a big problem: Malaria. It's a mosquito-borne disease that hits hard during certain seasons, like a storm that only comes in the summer.

Here is the story of how a new health program tried to stop this storm, told simply:

The Problem: The "Moving Target"

Traditional ways of fighting malaria, like putting nets on beds or spraying walls, don't work well here. Why? Because the families don't have permanent walls to spray, and they might not even be in the same village when the mosquitoes are most active. It's like trying to put a raincoat on a cloud that keeps moving.

The Solution: The "Medicine Train"

In 2024, health workers launched a new strategy called Seasonal Malaria Chemoprevention (SMC). Think of this as a "medicine train" that runs on a schedule.

Instead of waiting for sick people to come to a hospital, the health workers went to the people. They gave children a special combination of malaria-fighting drugs (called SPAQ) once a month for five months during the rainy season.

• The Plan: Give the first dose on Day 1 (watched by a health worker), and then the family gives the next two doses on Day 2 and Day 3.
• The Goal: Keep the children's bodies full of protection so the malaria parasites can't take hold.

How They Did It: The "Trusted Neighbors"

Since the families are scattered and moving, the health team used Community Health Promoters (CHPs). These aren't distant doctors in white coats; they are the neighbors, the cousins, and the local leaders who everyone already knows and trusts.

• Door-to-Door: The CHPs walked from tent to tent, like a friendly mail carrier delivering packages.
• The "Mobile Stop": In some places, they set up a temporary clinic under a big tree or at a school, acting like a pop-up shop that the community could visit.

The Results: A Big Win

The program was a huge success, especially for a first try in such a difficult area.

• 97% Reach: Almost every single eligible child got at least one round of medicine.
• 71% Completion: About 7 out of 10 children got all five rounds of protection.
• High Trust: 99% of parents said the health worker watched them take the first dose and explained everything clearly.

Why Did Some People Miss Out?

Even with a great plan, some kids didn't get the full protection. The researchers found three main reasons, like three different types of roadblocks:

1. The "Sick Child" Rule: If a child was already sick with malaria or another illness when the medicine arrived, the health workers told the parents to wait until the child was better. This was to be safe, but it meant some kids started late or missed the program entirely.
2. The "Wait and See" Crowd: Some parents were nervous. They had heard scary rumors about vaccines in the past. They wanted to watch their neighbors first to see if the medicine caused any bad reactions. Once they saw their neighbors' kids were fine, they joined in, but sometimes it was too late for the first round.
3. The "Too Rich" Paradox: Surprisingly, families with a bit more money were more likely to drop out. The researchers think this is because wealthier families might be busier with business, or they felt, "If my child gets sick, I can afford to go to the hospital, so I don't need the prevention."

The Secret Sauce: Trust and Clarity

The biggest factor for success wasn't just the medicine; it was the relationship.

• If a parent knew the health worker personally (like a neighbor they've known since childhood), they were much more likely to say "Yes."
• If the health worker clearly explained how to give the medicine and what side effects to expect, the parents felt confident giving the next doses at home.

The Takeaway

This study proves that even in the most remote, moving communities, you can stop malaria if you change the rules. You don't need to force people to come to you; you go to them, you use the people they already trust, and you make the process simple.

It's like trying to water a garden where the plants keep moving. Instead of waiting for the plants to come to the hose, you carry the water to them, one by one, with a friend they trust. And in Turkana, that approach worked beautifully.

Technical Summary

1. Problem Statement

Context: Malaria remains a critical public health burden in Kenya, particularly in Turkana County, a vast, arid region with a semi-nomadic pastoralist population. Traditional vector control methods (Indoor Residual Spraying and Insecticide-Treated Nets) are ineffective here due to temporary dwellings, outdoor sleeping, and high population mobility.
The Challenge: While Seasonal Malaria Chemoprevention (SMC) using Sulphadoxine-Pyrimethamine (SP) and Amodiaquine (AQ) is a proven intervention in the Sahel, its implementation in highly mobile, remote pastoralist communities in Kenya had not been previously evaluated. The primary barriers included:

• Mobility: Over 50% of families migrate seasonally with livestock.
• Access: Sparse settlements and limited health infrastructure make fixed-point delivery difficult.
• Adherence: Ensuring caregivers administer the 3-day regimen (Day 1 observed, Days 2–3 self-administered) correctly.
• Trust: Skepticism regarding new interventions and rumors of adverse effects.

2. Methodology

The study employed a convergent mixed-methods design conducted in Turkana Central sub-county following the first implementation of SMC in June–October 2024.

Quantitative Component:

• Sampling: A multistage cluster sampling design selected 449 households across 5 wards (stratified by urban/rural status).
• Population: 680 eligible children (aged 3–59 months) were analyzed.
• Data Collection: Structured interviews with caregivers using KOBOCollect tablets. Data included demographics, SMC uptake (cycles received), adherence to the 3-day regimen, and socioeconomic indicators.
• Analysis: Multi-level logistic regression was used to compare partial vs. complete SMC adopters, accounting for clustering at the ward and household levels.

Qualitative Component:

• Participants: 45 caregivers selected purposefully to represent three groups: Full adopters (5 cycles), Partial adopters (1–4 cycles), and Non-adopters (0 cycles).
• Data Collection: Semi-structured in-depth interviews (IDI) exploring barriers, facilitators, trust in distributors, and perceptions of safety/efficacy.
• Analysis: Thematic analysis using MAXQDA, focusing on credibility of Community Health Promoters (CHPs), rumors, and decision-making processes.

Intervention Details:

• Delivery: Primarily door-to-door by CHPs, supplemented by fixed/mobile points and integrated outreaches (combining SMC with ANC and nutrition screening).
• Regimen: 5 monthly cycles of SPAQ. Day 1 was directly observed; Days 2 and 3 were self-administered by caregivers.

3. Key Contributions

• First Evidence in Kenya: This is the first evaluation of SMC scale-up in Kenya, demonstrating feasibility in a non-Sahelian, highly mobile context.
• Delivery Model Validation: It validates a hybrid delivery model (door-to-door + mobile fixed points) as effective for reaching mobile pastoralists.
• Role of CHPs: The study provides robust evidence that the familiarity and trustworthiness of Community Health Promoters are the single most significant predictors of SMC uptake and adherence.
• Wealth Paradox: It identifies a counter-intuitive finding where wealthier households had higher odds of dropping out, challenging assumptions that poverty is the primary barrier to health intervention adherence in this context.

4. Key Results

Coverage and Adherence:

• Initial Uptake: 97% of eligible children received at least one cycle (95% CI: 94–99%).
• Full Completion: 71% of children completed all 5 cycles (95% CI: 66–75%).
• Adherence: 95% of caregivers correctly administered the Day 2 and Day 3 doses.
• Quality: 99% of caregivers reported direct observation of the first dose, and 98.9% received instructions on side effects.

Factors Influencing Coverage (Quantitative):

• Positive Predictors: Knowing the local CHP (Adj OR = 0.26) and discussing SMC with family/neighbors (Adj OR = 0.54) significantly reduced the odds of missing cycles.
• Negative Predictors: Children from the "least poor" wealth category had nearly double the odds of missing cycles compared to the poorest (Adj OR = 1.93).
• Distance: Contrary to expectations, distance to health facilities did not significantly predict non-completion, likely due to the effectiveness of the door-to-door strategy. However, late adopters lived significantly further away than those who dropped out.

Qualitative Insights:

• Trust & Credibility: Uptake was driven by trust in the CHP (familiarity, professional status, and training). Conversely, unfamiliar distributors or negative attitudes from other health workers reduced uptake.
• Safety Concerns: Late adoption was often driven by a "wait-and-see" approach. Caregivers observed other children to confirm safety before enrolling their own, influenced by past rumors regarding polio vaccines.
• Exclusion: Some children were missed because they were ill (malaria or other conditions) during the first cycle and were excluded by distributors until recovery, leading to late enrollment or dropout.
• Effectiveness: Sustained participation was heavily motivated by the observed reduction in malaria cases among children who received SMC.

5. Significance and Implications

• Scalability: The study proves that high-coverage SMC is achievable in marginalized, mobile populations through adaptive delivery strategies that leverage existing community networks (CHPs).
• Programmatic Recommendations:
  • CHP Integration: Strengthening the training and community integration of CHPs is critical for success.
  • Communication: Clear, early communication about side effects and the safety profile of SMC is essential to mitigate rumors and "wait-and-see" delays.
  • Timing: Programs must ensure children are treated for active malaria before SMC cycles begin to prevent exclusion and late adoption.
  • Targeting Wealthier Groups: Specific strategies are needed to engage wealthier households, who may perceive less need for prevention due to better access to curative care or have biases against lay health workers.
• Policy Impact: These findings support the expansion of SMC to similar mobile populations across East Africa and beyond, moving beyond the traditional Sahelian model.

In conclusion, the study establishes that with a community-centric, trust-based delivery model, Seasonal Malaria Chemoprevention can achieve high coverage and adherence even in the challenging logistical environment of northwest Kenya's pastoralist communities.