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A study analyzing data from 16 Ugandan districts between 2017-2022 found that drug-resistant malaria parasites carrying Kelch13 mutations are associated with significantly higher malaria infection rates. Each 10 percentage point increase in Kelch13 mutation prevalence was linked to a 13.1% increase in malaria incidence, even after accounting for climate factors and malaria control interventions. The prevalence of these artemisinin-resistant parasites increased throughout the study period, suggesting they may be contributing to sustained malaria transmission.
Why it matters
This research provides critical evidence that drug-resistant malaria is not only spreading in Africa but may be actively undermining malaria control efforts by increasing transmission rates. The findings highlight the urgent need for integrated surveillance combining genetic monitoring with epidemiological data to protect the effectiveness of artemisinin-based treatments, which remain the primary malaria therapy worldwide.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Artemisinin partial resistance (ART R) associated Plasmodium falciparum Kelch13 mutations is expanding across Africa. However, their population level consequences remain poorly understood, particularly in settings of moderate to high malaria transmission. We investigated associations between Kelch13 and partner drug mutation prevalence and monthly confirmed malaria incidence across 16 Ugandan districts from 2017 to 2022, using integrated molecular, epidemiological, climatic, malaria control, and antimalarial resistance data and negative binomial regression. Combined prevalence of WHO validated and candidate Kelch13 mutations increased over the study period. Each 10 percentage point increase in Kelch13 prevalence was associated with a 13.1% higher incidence after multivariable adjustment (aIRR 1.131, 95% CI 1.090 to 1.174). Furthermore, each 10% increase in pfcrt K76T was associated with a 24% increase in malaria transmission. As expected, ITN distribution >80%, IRS coverage >90%, and higher altitude were associated with lower incidence, whereas temperatures of 25 to 30C, relative humidity of 60 to 80%, and higher precipitation were associated with higher incidence. The persistence of the Kelch13 and pfcrt K76T association after adjustment suggests that expanding ART R associated parasite populations are independently associated with malaria incidence. The relationship may be bidirectional. These findings support interpreting ART R within its ecological and intervention context and integrating molecular, epidemiological, and malaria control surveillance to safeguard antimalarial efficacy.