How the Malaria Vector Anopheles gambiae Adapts to the Use of Insecticide-Treated Nets by African Populations
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BACKGROUND: Insecticide treated bed nets have been recommended and proven efficient as a measure to protect African populations from malaria mosquito vector Anopheles spp. This study evaluates the consequences of bed nets use on vectors resistance to insecticides, their feeding behavior and malaria transmission in Dielmo village, Senegal, were LLINs were offered to all villagers in July 2008. METHODS: Adult mosquitoes were collected monthly from January 2006 to December 2011 by human landing catches (HLC) and by pyrethroid spray catches (PCS). A randomly selected sub-sample of 15-20% of An. gambiae s.l. collected each month was used to investigate the molecular forms of the An. gambiae complex, kdr mutations, and Plasmodium falciparum circumsporozoite (CSP) rate. Malaria prevalence and gametocytaemia in Dielmo villagers were measured quarterly. RESULTS: Insecticide susceptible mosquitoes (wild kdr genotype) presented a reduced lifespan after LLINs implementation but they rapidly adapted their feeding behavior, becoming more exophageous and zoophilic, and biting earlier during the night. In the meantime, insecticide-resistant specimens (kdr L1014F genotype) increased in frequency in the population, with an unchanged lifespan and feeding behaviour. P. falciparum prevalence and gametocyte rate in villagers decreased dramatically after LLINs deployment. Malaria infection rate tended to zero in susceptible mosquitoes whereas the infection rate increased markedly in the kdr homozygote mosquitoes. CONCLUSION: Dramatic changes in vector populations and their behavior occurred after the deployment of LLINs due to the extraordinary adaptative skills of An. gambiae s. l. mosquitoes. However, despite the increasing proportion of insecticide resistant mosquitoes and their almost exclusive responsibility in malaria transmission, the P. falciparum gametocyte reservoir continued to decrease three years after the deployment of LLINs.
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Increase in kdr frequencies was evidenced in An. gambiae (s.l.) after the distribution of LLINs in Kenya, Niger, Senegal and Benin.
“Besides that, increase in kdr frequencies was evidenced in An. gambiae (s.l.) after the distribution of LLINs in Kenya [34], Niger [35], Senegal [36] and Benin [37].”
From Mapping insecticide resistance in Anopheles gambiae (s.l.) from Côte d'Ivoire (2018) · cites this paper as [36]
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- Authors
- Ndiath, M. O., Mazenot, C., Sokhna, C., & Trape, J.-F.
- Affiliations
- Institut Pasteur de Bangui (CF)
- Institut de Recherche pour le Développement (BJ)
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Ndiath, Mamadou Ousmane
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2014-06-03
- Volume
- 9
- Issue
- 6
- Pages
- e97700
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC4043680
- OpenAlex
- W2017593409
- Cited by
- 37
- References
- 34
- Citations by year
- 2024: 2 · 2022: 1 · 2021: 1 · 2020: 5 · 2019: 4 · 2018: 1 · 2017: 4 · 2016: 9 · 2015: 9 · 2014: 1
- FWCI
- 7.63
- Type
- journal article
- Language
- en
- Status
- Retracted
- Update notices
- retraction (2016-05-19)
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Malaria Research and Control
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Insect Resistance and Genetics
- Life Sciences › Immunology and Microbiology › Parasitology › Vector-borne infectious diseases
- Keywords
- Anopheles gambiae, insecticide-treated nets, insecticide resistance, kdr mutation, mosquito feeding behavior, zoophily, exophagy, biting time, mosquito longevity, malaria transmission, Plasmodium falciparum, gametocytaemia, circumsporozoite protein, vector adaptation
- MeSH terms
- Adaptation, Physiological, Africa, Animals, Anopheles, Feeding Behavior, Genotype, Germ Cells, Humans, Insect Vectors, Malaria, Species Specificity, Time Factors, Protozoan Proteins, Insecticide-Treated Bednets
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