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The interplay between malaria vectors and human activity accounts for high residual malaria transmission in a Burkina Faso village with universal ITN coverage.
Perugini, Eleonora; Guelbeogo, Wamdaogo M; Guglielmo, Federica; Poggi, Cristiana; Gabrieli, Eugenio; Ranson, Hilary; Della Torre, Alessandra; Pombi, Marco.
Afiliación
  • Perugini E; Department of Public Health and Infectious Diseases, Sapienza University, Rome, Italy.
  • Guelbeogo WM; Centre National de Recherche et Formation sur le Paludisme, Ouagadougou, Burkina Faso.
  • Guglielmo F; Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK.
  • Poggi C; Department of Public Health and Infectious Diseases, Sapienza University, Rome, Italy.
  • Gabrieli E; Department of Public Health and Infectious Diseases, Sapienza University, Rome, Italy.
  • Ranson H; Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK.
  • Della Torre A; Department of Public Health and Infectious Diseases, Sapienza University, Rome, Italy.
  • Pombi M; Department of Public Health and Infectious Diseases, Sapienza University, Rome, Italy. marco.pombi@uniroma1.it.
Parasit Vectors ; 16(1): 101, 2023 Mar 15.
Article en En | MEDLINE | ID: mdl-36922855
BACKGROUND: Mosquito and human behaviour interaction is a key determinant of the maximum level of protection against malaria that can be provided by insecticide-treated nets (ITNs). Nevertheless, scant literature focuses on this interaction, overlooking a fundamental factor for efficient malaria control. This study aims to estimate malaria transmission risk in a Burkina Faso village by integrating vector biting rhythms with some key information about human habits. METHODS: Indoor/outdoor human landing catches were conducted for 16 h (16:00-08:00) during 8 nights (September 2020) in Goden village. A survey about net usage and sleeping patterns was submitted to half the households (October-December 2020). A subsample of collected specimens of Anopheles gambiae sensu lato was molecularly processed for species identification, Plasmodium detection from heads-thoraxes and L1014F pyrethroid-resistance allele genotyping. Hourly mosquito abundance was statistically assessed by GLM/GAM, and the entomological inoculation rate (EIR) was corrected for the actual ITN usage retrieved from the questionnaire. RESULTS: Malaria transmission was mainly driven by Anopheles coluzzii (68.7%) followed by A. arabiensis (26.2%). The overall sporozoite rate was 2% with L1014F estimated frequency of 0.68 (N = 1070 out of 15,201 A. gambiae s.l. collected). No major shift in mosquito biting rhythms in response to ITN or differences between indoor and outdoor catches were detected. Impressive high biting pressure (mean 30.3 mosquitoes/person/hour) was exerted from 20:00 to 06:00 with a peak at 4:00. Human survey revealed that nearly all inhabitants were awake before 20:00 and after 7:00 and at least 8.7% had no access to bednets. Adjusting for anthropological data, the EIR dropped from 6.7 to 1.2 infective bites/person/16 h. In a scenario of full net coverage and accounting only for the human sleeping patterns, the daily malaria transmission risk not targetable by ITNs was 0.69 infective bites. CONCLUSIONS: The high mosquito densities and interplay between human/vector activities means that an estimated 10% of residual malaria transmission cannot be prevented by ITNs in the village. Locally tailored studies, like the current one, are essential to explore the heterogeneity of human exposure to infective bites and, consequently, to instruct the adoption of new vector control tools strengthening individual and community protection.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Insecticidas / Malaria / Anopheles Tipo de estudio: Prognostic_studies Límite: Animals / Humans País/Región como asunto: Africa Idioma: En Revista: Parasit Vectors Año: 2023 Tipo del documento: Article País de afiliación: Italia Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Insecticidas / Malaria / Anopheles Tipo de estudio: Prognostic_studies Límite: Animals / Humans País/Región como asunto: Africa Idioma: En Revista: Parasit Vectors Año: 2023 Tipo del documento: Article País de afiliación: Italia Pais de publicación: Reino Unido