Vector competence of sterile male Glossina fuscipes fuscipes for Trypanosoma brucei brucei: implications for the implementation of the sterile insect technique in a sleeping sickness focus in Chad

Autor: Mahamat Hissene Mahamat, Adeline Ségard, Jean-Baptiste Rayaisse, Rafael Argiles-Herrero, Andrew Gordon Parker, Philippe Solano, Adly Mohamed Mohamed Abd-Alla, Jérémy Bouyer, Sophie Ravel
Přispěvatelé: Institut de Recherche en Elevage pour le Developpement [N'Djamena, Tchad] (IRED), Interactions hôtes-vecteurs-parasites-environnement dans les maladies tropicales négligées dues aux trypanosomatides (UMR INTERTRYP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Université de Bordeaux (UB), Centre international de recherche-développement sur l'élevage en zone sub-humide (CIRDES), Insect Pest Control Laboratory (IPC laboratory), Food and Agriculture Organization of the United Nations [Rome, Italie] (FAO)-International Atomic Energy Agency [Vienna] (IAEA), Animal, Santé, Territoires, Risques et Ecosystèmes (UMR ASTRE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Département Systèmes Biologiques (Cirad-BIOS), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Joint FAO/IAEA Programme - Nuclear Techniques in Food and Agriculture, This work was funded by IAEA grant EVT 1804311 to Hissene Mahamat and was supported by the project, Research Infrastructures for the control of vector-borne diseases (Infravec2), which has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement number 731060., European Project: 731060,INFRAVEC2(2017)
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Parasites & Vectors
Parasites & Vectors, 2023, 16 (1), pp.111. ⟨10.1186/s13071-023-05721-4⟩
ISSN: 1756-3305
DOI: 10.1186/s13071-023-05721-4⟩
Popis: Background Human African trypanosomiasis (HAT) is a neglected tropical disease caused by Trypanosoma brucei gambiense transmitted by tsetse flies in sub-Saharan West Africa. In southern Chad the most active and persistent focus is the Mandoul focus, with 98% of the reported human cases, and where African animal trypanosomosis (AAT) is also present. Recently, a control project to eliminate tsetse flies (Glossina fuscipes fuscipes) in this focus using the sterile insect technique (SIT) was initiated. However, the release of large numbers of sterile males of G. f. fuscipes might result in a potential temporary increase in transmission of trypanosomes since male tsetse flies are also able to transmit the parasite. The objective of this work was therefore to experimentally assess the vector competence of sterile males treated with isometamidium for Trypanosoma brucei brucei. Methods An experimental infection was set up in the laboratory, mimicking field conditions: the same tsetse species that is present in Mandoul was used. A T. b. brucei strain close to T. b. gambiense was used, and the ability of the sterile male tsetse flies fed on blood with and without a trypanocide to acquire and transmit trypanosomes was measured. Results Only 2% of the experimentally infected flies developed an immature infection (midgut) while none of the flies developed a metacyclic infection of T. b. brucei in the salivary glands. We did not observe any effect of the trypanocide used (isometamidium chloride at 100 mg/l) on the development of infection in the flies. Conclusions Our results indicate that sterile males of the tested strain of G. f. fuscipes were unable to cyclically transmit T. b. brucei and might even be refractory to the infection. The data of the research indicate that the risk of cyclical transmission of T. brucei by sterile male G. f. fuscipes of the strain colonized at IAEA for almost 40 years appears to be small. Graphical Abstract
Databáze: OpenAIRE
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