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Sickle-trait hemoglobin does not influence Anopheles biting rates
Christine F Markwalter1, Emmah Kimachas2, Erastus Kirwa2
1Duke Global Health Institute, Duke University, Durham, NC, USA.
Medrxiv : the Preprint Server for Health Sciences
|December 3, 2025
Summary
Children with sickle cell trait (HbAS) have malaria protection. This study found sickle cell trait does not reduce exposure to infectious mosquito bites, suggesting other resistance mechanisms are at play.
Area of Science:
- Malariology
- Genetics
- Epidemiology
Background:
- Sickle cell trait (HbAS) confers protection against severe Plasmodium falciparum malaria.
- Mechanisms of this protection are not fully understood, particularly regarding mosquito bite exposure.
Purpose of the Study:
- To investigate if sickle cell trait influences exposure to P. falciparum-infected mosquito bites.
- To determine individual mosquito biting rates in relation to human beta-globin genotypes.
Main Methods:
- A 15-month cohort study in Western Kenya.
- Matching mosquito bloodmeals to human hosts using short tandem repeat (STR) genotypes.
- Multilevel multivariable modeling to assess mosquito biting behavior based on human beta-globin genotypes (HbAA vs. HbAS).
Main Results:
- No significant difference in mosquito biting rates was observed between individuals with HbAA and HbAS genotypes (BRR: 1.23, 95% CI: 0.86 - 1.77).
- Individual mosquito biting rates were comparable across different beta-globin genotypes.
Conclusions:
- The protective effect of sickle cell trait against severe malaria is unlikely due to reduced exposure to infectious mosquito bites.
- Other within-host resistance mechanisms likely contribute to the observed malaria protection in individuals with sickle cell trait.
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