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Mancini MV, Murdochy SM, Bilgo E, Ant TH, Gingell D, Gnambani EJ, Failloux AB, Diabate A, Sinkins SP. Wolbachia strain wAlbB shows favourable characteristics for dengue control use in Aedes aegypti from Burkina Faso. Environ Microbiol 2024; 26:e16588. [PMID: 38450576 DOI: 10.1111/1462-2920.16588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 01/23/2024] [Indexed: 03/08/2024]
Abstract
Dengue represents an increasing public health burden worldwide. In Africa, underreporting and misdiagnosis often mask its true epidemiology, and dengue is likely to be both more widespread than reported data suggest and increasing in incidence and distribution. Wolbachia-based dengue control is underway in Asia and the Americas but has not to date been deployed in Africa. Due to the genetic heterogeneity of African Aedes aegypti populations and the complexity of the host-symbiont interactions, characterization of key parameters of Wolbachia-carrying mosquitoes is paramount for determining the potential of the system as a control tool for dengue in Africa. The wAlbB Wolbachia strain was stably introduced into an African Ae. aegypti population by introgression, and showed high intracellular density in whole bodies and different mosquito tissues; high intracellular density was also maintained following larval rearing at high temperatures. No effect on the adult lifespan induced by Wolbachia presence was detected. Moreover, the ability of this strain to strongly inhibit DENV-2 dissemination and transmission in the host was also demonstrated in the African background. Our findings suggest the potential of harnessing Wolbachia for dengue control for African populations of Ae. aegypti.
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Affiliation(s)
- Maria Vittoria Mancini
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy
| | | | - Etienne Bilgo
- Institut de Recherche en Sciences de la Santé, Direction Régionale de l'Ouest, Dioulasso, Burkina Faso
- Institut National de Santé Publique/Centre Muraz, Dioulasso, Burkina Faso
| | - Thomas H Ant
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK
| | - Daniel Gingell
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK
| | - Edounou Jacques Gnambani
- Institut de Recherche en Sciences de la Santé, Direction Régionale de l'Ouest, Dioulasso, Burkina Faso
- Institut National de Santé Publique/Centre Muraz, Dioulasso, Burkina Faso
| | - Anna-Bella Failloux
- Institut Pasteur, Université Paris Cité, Arboviruses and Insect Vectors Unit, Paris, France
| | - Abdoulaye Diabate
- Institut de Recherche en Sciences de la Santé, Direction Régionale de l'Ouest, Dioulasso, Burkina Faso
- Institut National de Santé Publique/Centre Muraz, Dioulasso, Burkina Faso
| | - Steven P Sinkins
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK
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Moustapha LM, Sadou IM, Arzika II, Maman LI, Gomgnimbou MK, Konkobo M, Diabate A, Bilgo E. First identification of Microsporidia MB in Anopheles coluzzii from Zinder City, Niger. Parasit Vectors 2024; 17:39. [PMID: 38287334 PMCID: PMC10826271 DOI: 10.1186/s13071-023-06059-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 11/15/2023] [Indexed: 01/31/2024] Open
Abstract
BACKGROUND Malaria, a disease transmitted by Anopheles mosquitoes, is a major public health problem causing millions of deaths worldwide, mostly among children under the age of 5 years. Biotechnological interventions targeting parasite-vector interactions have shown that the microsporidian symbiont Microsporidia MB has the potential to disrupt and block Plasmodium transmission. METHODS A prospective cross-sectional survey was conducted in Zinder City (Zinder), Niger, from August to September 2022, using the CDC light trap technique to collect adult mosquitoes belonging to the Anopheles gambiae complex. The survey focused on collecting mosquitoes from three neighborhoods of Zinder (Birni, Kangna and Garin Malan, located in communes I, II and IV, respectively). Collected mosquitoes were sorted and preserved in 70% ethanol. PCR was used to identify host species and detect the presence of Microsporidia MB and Plasmodium falciparum infection. RESULTS Of the 257 Anopheles mosquitoes collected and identified by PCR, Anopheles coluzzii was the most prevalent species, accounting for 97.7% of the total. Microsporidia MB was exclusively detected in A. coluzzii, with a prevalence of 6.8% (17/251) among the samples. No significant difference in prevalence was found among the three neighborhoods. Only one An. coluzzii mosquito tested PCR-positive for P. falciparum. CONCLUSIONS The results confirm the presence of Microsporidia MB in Anopheles mosquitoes in Zinder, Niger, indicating its potential use as a biotechnological intervention against malaria transmission. However, further studies are needed to determine the efficacy of Microsporidia MB to disrupt Plasmodium transmission as well as its impact on vector fitness.
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Affiliation(s)
- Lamine Mahaman Moustapha
- Faculté de Sciences et Techniques de l'Université André Salifou, Zinder, Niger.
- Centre de Recherche Médicale et Sanitaire (CERMES), Niamey, Niger.
| | - Illiassou Mamane Sadou
- Centre d'Excellence Africain en Innovations Biotechnologiques pour l'Elimination des Maladies à Transmission Vectorielle (CEA/ITECH-MTV), Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso
| | | | | | - Michel K Gomgnimbou
- Centre d'Excellence Africain en Innovations Biotechnologiques pour l'Elimination des Maladies à Transmission Vectorielle (CEA/ITECH-MTV), Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso
- Centre Muraz, Institut National de Santé Publique (INSP), Bobo Dioulasso, Burkina Faso
| | - Maurice Konkobo
- Centre d'Excellence Africain en Innovations Biotechnologiques pour l'Elimination des Maladies à Transmission Vectorielle (CEA/ITECH-MTV), Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso
- Centre Muraz, Institut National de Santé Publique (INSP), Bobo Dioulasso, Burkina Faso
- Institut de Recherche en Sciences de la Santé (IRSS), Direction Régionale de l'Ouest, Bobo Dioulasso, Burkina Faso
| | - Abdoulaye Diabate
- Centre d'Excellence Africain en Innovations Biotechnologiques pour l'Elimination des Maladies à Transmission Vectorielle (CEA/ITECH-MTV), Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso
- Centre Muraz, Institut National de Santé Publique (INSP), Bobo Dioulasso, Burkina Faso
- Institut de Recherche en Sciences de la Santé (IRSS), Direction Régionale de l'Ouest, Bobo Dioulasso, Burkina Faso
| | - Etienne Bilgo
- Centre d'Excellence Africain en Innovations Biotechnologiques pour l'Elimination des Maladies à Transmission Vectorielle (CEA/ITECH-MTV), Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso.
- Centre Muraz, Institut National de Santé Publique (INSP), Bobo Dioulasso, Burkina Faso.
- Institut de Recherche en Sciences de la Santé (IRSS), Direction Régionale de l'Ouest, Bobo Dioulasso, Burkina Faso.
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Ochomo E, Rund SSC, Mthawanji RS, Antonio-Nkondjio C, Machani M, Samake S, Wolie RZ, Nsango S, Lown LA, Matoke-Muhia D, Kamau L, Lukyamuzi E, Njeri J, Chabi J, Akrofi OO, Ntege C, Mero V, Mwalimu C, Kiware S, Bilgo E, Traoré MM, Afrane Y, Hakizimana E, Muleba M, Orefuwa E, Chaki P, Juma EO. Mosquito control by abatement programmes in the United States: perspectives and lessons for countries in sub-Saharan Africa. Malar J 2024; 23:8. [PMID: 38178145 PMCID: PMC10768238 DOI: 10.1186/s12936-023-04829-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 12/21/2023] [Indexed: 01/06/2024] Open
Abstract
Africa and the United States are both large, heterogeneous geographies with a diverse range of ecologies, climates and mosquito species diversity which contribute to disease transmission and nuisance biting. In the United States, mosquito control is nationally, and regionally coordinated and in so much as the Centers for Disease Control (CDC) provides guidance, the Environmental Protection Agency (EPA) provides pesticide registration, and the states provide legal authority and oversight, the implementation is usually decentralized to the state, county, or city level. Mosquito control operations are organized, in most instances, into fully independent mosquito abatement districts, public works departments, local health departments. In some cases, municipalities engage independent private contractors to undertake mosquito control within their jurisdictions. In sub-Saharan Africa (SSA), where most vector-borne disease endemic countries lie, mosquito control is organized centrally at the national level. In this model, the disease control programmes (national malaria control programmes or national malaria elimination programmes (NMCP/NMEP)) are embedded within the central governments' ministries of health (MoHs) and drive vector control policy development and implementation. Because of the high disease burden and limited resources, the primary endpoint of mosquito control in these settings is reduction of mosquito borne diseases, primarily, malaria. In the United States, however, the endpoint is mosquito control, therefore, significant (or even greater) emphasis is laid on nuisance mosquitoes as much as disease vectors. The authors detail experiences and learnings gathered by the delegation of African vector control professionals that participated in a formal exchange programme initiated by the Pan-African Mosquito Control Association (PAMCA), the University of Notre Dame, and members of the American Mosquito Control Association (AMCA), in the United States between the year 2021 and 2022. The authors highlight the key components of mosquito control operations in the United States and compare them to mosquito control programmes in SSA countries endemic for vector-borne diseases, deriving important lessons that could be useful for vector control in SSA.
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Affiliation(s)
- Eric Ochomo
- Entomology Department, Centre for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya.
- Vector Control Products Unit, Researchworld Limited, Kisumu, Kenya.
| | | | - Rosheen S Mthawanji
- Vector Biology Group, Malawi Liverpool Wellcome Trust Clinical Research Programme, Blantyre, Malawi
| | - Christophe Antonio-Nkondjio
- Organisation de Coordination Pour la lutte contre les Endémies en Afrique centrale (OCEAC), Yaounde, Cameroon
| | - Maxwell Machani
- Entomology Department, Centre for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya
| | | | - Rosine Z Wolie
- Vector Control Product Evaluation Centre - Institut Pierre Richet (VCPEC-IPR), Institut National de Santé Publique (INSP), Bouaké, Côte d'Ivoire
- Unité de Formation et de Recherche des Sciences de la Nature, Université Nangui Abrogoua, Abdijan, Côte d'Ivoire
| | - Sandrine Nsango
- Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala, Cameroon
- Centre Pasteur in Cameroon, Yaounde, Cameroon
| | | | - Damaris Matoke-Muhia
- Pan-African Mosquito Control Association (PAMCA), KEMRI Headquarters, Nairobi, Kenya
- Centre for Biotechnology Research and Development, Kenya Medical Research Institute, Nairobi, Kenya
| | - Luna Kamau
- Centre for Biotechnology Research and Development, Kenya Medical Research Institute, Nairobi, Kenya
| | - Edward Lukyamuzi
- Pan-African Mosquito Control Association (PAMCA), KEMRI Headquarters, Nairobi, Kenya
| | - Jane Njeri
- Pan-African Mosquito Control Association (PAMCA), KEMRI Headquarters, Nairobi, Kenya
| | | | | | - Charles Ntege
- National Malaria Control Division Ministry of Health, Kampala, Uganda
| | - Victor Mero
- Ifakara Health Institute (IHI), Dar es Salaam, Tanzania
| | | | - Samson Kiware
- Pan-African Mosquito Control Association (PAMCA), KEMRI Headquarters, Nairobi, Kenya
- Ifakara Health Institute (IHI), Dar es Salaam, Tanzania
| | - Etienne Bilgo
- Institut de Recherche en Sciences de la Sante (IRSS) Direction regionale de l'Ouest, Bobo Dioulasso, Burkina Faso
| | - Mohamed Moumine Traoré
- Malaria Research and Training Centre, Faculty of Medicine, Pharmacy and Odonto-Stomatology, University of Sciences, Techniques and Technology of Bamako, BP 1805, Bamako, Mali
| | - Yaw Afrane
- Department of Medical Microbiology, University of Ghana Medical School, College of Health Sciences, University of Ghana, Accra, Ghana
| | - Emmanuel Hakizimana
- Malaria and Other Parasitic Diseases Division, Rwanda Biomedical Centre (RBC), Ministry of Health, Kigali, Rwanda
- Pan-African Mosquito Control Organization (PAMCO), Rwanda Chapter, Kigali, Rwanda
| | | | - Emma Orefuwa
- Pan-African Mosquito Control Association (PAMCA), KEMRI Headquarters, Nairobi, Kenya
| | - Prosper Chaki
- Pan-African Mosquito Control Association (PAMCA), KEMRI Headquarters, Nairobi, Kenya
| | - Elijah Omondi Juma
- Pan-African Mosquito Control Association (PAMCA), KEMRI Headquarters, Nairobi, Kenya
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Sare I, Baldini F, Viana M, Badolo A, Djigma F, Diabate A, Bilgo E. Adhesion and virulence properties of native Metarhizium fungal strains from Burkina Faso for the control of malaria vectors. Parasit Vectors 2023; 16:406. [PMID: 37936204 PMCID: PMC10629044 DOI: 10.1186/s13071-023-05831-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 06/06/2023] [Indexed: 11/09/2023] Open
Abstract
BACKGROUND Local strains of the entomopathogenic fungus Metarhizium pingshaense in Burkina Faso have demonstrated remarkable virulence against malaria vectors, positioning them as promising candidates for inclusion in the future arsenal of malaria control strategies. However, the underlying mechanisms responsible for this virulence remain unknown. To comprehend the fungal infection process, it is crucial to investigate the attachment mechanisms of fungal spores to the mosquito cuticle and explore the relationship between virulence and attachment kinetics. This study aims to assess the adhesion and virulence properties of native Metarhizium fungal strains from Burkina Faso for controlling malaria vectors. METHODS Fungal strains were isolated from 201 insects and 1399 rhizosphere samples, and four strains of Metarhizium fungi were selected. Fungal suspensions were used to infect 3-day-old female Anopheles coluzzii mosquitoes at three different concentrations (106, 107, 108 conidia/ml). The survival of the mosquitoes was measured over 14 days, and fungal growth was quantified after 1 and 24 h to assess adhesion of the fungal strains onto the mosquito cuticle. RESULTS All four fungi strains increased mosquito mortality compared to control (Chi-square test, χ2 = 286.55, df = 4, P < 0.001). Adhesion of the fungal strains was observed on the mosquito cuticle after 24 h at high concentrations (1 × 108 conidia/ml), with one strain, having the highest virulent, showing adhesion after just 1 h. CONCLUSION The native strains of Metarhizium spp. fungi found in Burkina Faso have the potential to be effective biocontrol agents against malaria vectors, with some strains showing high levels of both virulence and adhesion to the mosquito cuticle.
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Affiliation(s)
- Issiaka Sare
- Institut de Recherche en Sciences de la Santé, Direction Régionale de l'Ouest, BP 545, Bobo-Dioulasso 01, Burkina Faso
- Institut National de Santé Publique / Centre Muraz, BP 390, Bobo-Dioulasso 01, Burkina Faso
- Laboratoire d'Entomologie Fondamentale et Appliquée (LEFA), Université Joseph Ki-Zerbo, BP 7021, Ouagadougou 03, Burkina Faso
- Laboratoire de Biologie Moléculaire et de Génétique (LABIOGENE), Ecole Doctorale Sciences et Technologie, Université Joseph Ki-Zerbo, BP 7021, Ouagadougou 01, Burkina Faso
- Centre de Recherche Biomoléculaire Piétro Annigoni (CERBA), BP 364, Ouagadougou 01, Burkina Faso
| | - Francesco Baldini
- School of Biodiversity One Health and Veterinary Medicine, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Mafalda Viana
- School of Biodiversity One Health and Veterinary Medicine, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Athanase Badolo
- Laboratoire d'Entomologie Fondamentale et Appliquée (LEFA), Université Joseph Ki-Zerbo, BP 7021, Ouagadougou 03, Burkina Faso
| | - Florencia Djigma
- Laboratoire de Biologie Moléculaire et de Génétique (LABIOGENE), Ecole Doctorale Sciences et Technologie, Université Joseph Ki-Zerbo, BP 7021, Ouagadougou 01, Burkina Faso
- Centre de Recherche Biomoléculaire Piétro Annigoni (CERBA), BP 364, Ouagadougou 01, Burkina Faso
| | - Abdoulaye Diabate
- Institut de Recherche en Sciences de la Santé, Direction Régionale de l'Ouest, BP 545, Bobo-Dioulasso 01, Burkina Faso.
- Institut National de Santé Publique / Centre Muraz, BP 390, Bobo-Dioulasso 01, Burkina Faso.
| | - Etienne Bilgo
- Institut de Recherche en Sciences de la Santé, Direction Régionale de l'Ouest, BP 545, Bobo-Dioulasso 01, Burkina Faso.
- Institut National de Santé Publique / Centre Muraz, BP 390, Bobo-Dioulasso 01, Burkina Faso.
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Huang W, Rodrigues J, Bilgo E, Tormo JR, Challenger JD, De Cozar-Gallardo C, Pérez-Victoria I, Reyes F, Castañeda-Casado P, Gnambani EJ, Hien DFDS, Konkobo M, Urones B, Coppens I, Mendoza-Losana A, Ballell L, Diabate A, Churcher TS, Jacobs-Lorena M. Delftia tsuruhatensis TC1 symbiont suppresses malaria transmission by anopheline mosquitoes. Science 2023; 381:533-540. [PMID: 37535741 DOI: 10.1126/science.adf8141] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 06/22/2023] [Indexed: 08/05/2023]
Abstract
Malaria control demands the development of a wide range of complementary strategies. We describe the properties of a naturally occurring, non-genetically modified symbiotic bacterium, Delftia tsuruhatensis TC1, which was isolated from mosquitoes incapable of sustaining the development of Plasmodium falciparum parasites. D. tsuruhatensis TC1 inhibits early stages of Plasmodium development and subsequent transmission by the Anopheles mosquito through secretion of a small-molecule inhibitor. We have identified this inhibitor to be the hydrophobic molecule harmane. We also found that, on mosquito contact, harmane penetrates the cuticle, inhibiting Plasmodium development. D. tsuruhatensis TC1 stably populates the mosquito gut, does not impose a fitness cost on the mosquito, and inhibits Plasmodium development for the mosquito's life. Contained field studies in Burkina Faso and modeling showed that D. tsuruhatensis TC1 has the potential to complement mosquito-targeted malaria transmission control.
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Affiliation(s)
- Wei Huang
- Department of Molecular Microbiology and Immunology, Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
| | | | - Etienne Bilgo
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP: 545, Burkina Faso
| | | | - Joseph D Challenger
- MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, London W2 1PG, UK
| | | | | | | | - Pablo Castañeda-Casado
- Drug Metabolism and Pharmacokinetics (DMPK) Discovery, In Vitro/In Vivo Translation (IVIVT), GSK, 28760 Tres Cantos, Madrid, Spain
| | | | | | - Maurice Konkobo
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP: 545, Burkina Faso
| | - Beatriz Urones
- Global Health Medicines R&D, GSK, Tres Cantos, 28760 Madrid, Spain
| | - Isabelle Coppens
- Department of Molecular Microbiology and Immunology, Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
| | | | - Lluís Ballell
- Global Health Medicines R&D, GSK, Tres Cantos, 28760 Madrid, Spain
| | - Abdoulaye Diabate
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP: 545, Burkina Faso
| | - Thomas S Churcher
- MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, London W2 1PG, UK
| | - Marcelo Jacobs-Lorena
- Department of Molecular Microbiology and Immunology, Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
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Gnambani EJ, Bilgo E, Dabiré RK, Belem AMG, Diabaté A. Infection of the malaria vector Anopheles coluzzii with the entomopathogenic bacteria Chromobacterium anophelis sp. nov. IRSSSOUMB001 reduces larval survival and adult reproductive potential. Malar J 2023; 22:122. [PMID: 37055834 PMCID: PMC10103495 DOI: 10.1186/s12936-023-04551-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 04/01/2023] [Indexed: 04/15/2023] Open
Abstract
BACKGROUND Vector control tools are urgently needed to control malaria transmission in Africa. A native strain of Chromobacterium sp. from Burkina Faso was recently isolated and preliminarily named Chromobacterium anophelis sp. nov. IRSSSOUMB001. In bioassays, this bacterium showed a promising virulence against adult mosquitoes and reduces their blood feeding propensity and fecundity. The current study assessed the entomopathogenic effects of C. anophelis IRSSSOUMB001 on larval stages of mosquitoes, as well as its impacts on infected mosquitoes reproductive capacity and trans-generational effects. METHODS Virulence on larvae and interference with insemination were assayed by co-incubation with C. anophelis IRSSSOUMB001 at a range of 104 to 108 cfu/ml. Trans-generational effects were determined by measuring body size differences of progeny from infected vs. uninfected parent mosquitoes using wing size as a proxy. RESULTS Chromobacterium anophelis IRSSSOUMB001 killed larvae of the pyrethroid-resistant Anopheles coluzzii with LT80 of ~ 1.75 ± 0.14 days at 108 cfu/ml in larval breeding trays. Reproductive success was reduced as a measure of insemination rate from 95 ± 1.99% to 21 ± 3.76% for the infected females. There was a difference in wing sizes between control and infected mosquito offsprings from 2.55 ± 0.17 mm to 2.1 ± 0.21 mm in infected females, and from 2.43 ± 0.13 mm to 1.99 ± 0.15 mm in infected males. CONCLUSIONS This study showed that C. anophelis IRSSSOUMB001 was highly virulent against larvae of insecticide-resistant Anopheles coluzzii, and reduced both mosquito reproduction capacity and offspring fitness. Additional laboratory, field, safety and social acceptance studies are needed to draw firm conclusions about the practical utility of this bacterial strain for malaria vector control.
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Affiliation(s)
- Edounou Jacques Gnambani
- Institut de Recherche en Sciences de la Santé (IRSS) Direction Régionale de l'Ouest (DRO)/CNRST, Bobo-Dioulasso, Burkina Faso
- Institut National de Santé Publique (INSP), Centre Muraz, Bobo Dioulasso, Burkina Faso
- Centre d'Excellence Africain en Innovations Biotechnologiques Pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH/MTV)/Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso
| | - Etienne Bilgo
- Institut de Recherche en Sciences de la Santé (IRSS) Direction Régionale de l'Ouest (DRO)/CNRST, Bobo-Dioulasso, Burkina Faso.
- Institut National de Santé Publique (INSP), Centre Muraz, Bobo Dioulasso, Burkina Faso.
- Centre d'Excellence Africain en Innovations Biotechnologiques Pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH/MTV)/Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso.
| | - Roch K Dabiré
- Institut de Recherche en Sciences de la Santé (IRSS) Direction Régionale de l'Ouest (DRO)/CNRST, Bobo-Dioulasso, Burkina Faso
- Institut National de Santé Publique (INSP), Centre Muraz, Bobo Dioulasso, Burkina Faso
- Centre d'Excellence Africain en Innovations Biotechnologiques Pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH/MTV)/Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso
| | | | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de la Santé (IRSS) Direction Régionale de l'Ouest (DRO)/CNRST, Bobo-Dioulasso, Burkina Faso.
- Institut National de Santé Publique (INSP), Centre Muraz, Bobo Dioulasso, Burkina Faso.
- Centre d'Excellence Africain en Innovations Biotechnologiques Pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH/MTV)/Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso.
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Balboné M, Diloma Soma D, Fogné Drabo S, Namountougou M, Konaté H, Benson Meda G, Sawadogo I, Romba R, Bilgo E, Nebié RCH, Bassolé IHN, Dabire RK, Gnankine O. Alternatives to Pyrethroid Resistance: Combinations of Cymbopogon nardus and Ocimum americanum Essential Oils Improve the Bioefficiency Control Against the Adults' Populations of Aedes aegypti (Diptera: Culicidae). J Med Entomol 2022; 59:2102-2109. [PMID: 36223259 DOI: 10.1093/jme/tjac148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Indexed: 06/16/2023]
Abstract
Dengue vector control strategies are mostly based on chemicals use against Aedes aegypti populations. The current study aimed at investigating the insecticidal effects of essential oils (EOs) obtained from five plant species, Cymbopogon citrates (D. C.) Stapf. (Poaceae), Cymbopogon nardus (Linn.) Rendle (Poaceae), Eucalyptus camaldulensis Linn. (Myrtaceae), Lippia multiflora Moldenke (Verbenaceae), and Ocimum americanum Linn. Lamiaceae, and combinations of Cymbopogon nardus and Ocimum americanum on Ae. aegypti populations from Bobo-Dioulasso. For this purpose, adults of the susceptible and field strains of Ae. aegypti were tested in WHO tubes with EO alone and binary combinations of O. americanum (OA) and C. nardus (CN; scored from C1 to C9). The extraction of the essential oils was done by hydrodistillation, and their components were determined by GC/MS. Among the 5 EOs tested, L. multiflora essential oil was the most efficient, with KDT50 values below 60 min on all Ae. aegypti strains tested, and also with a rate of mortality up to 100 and 85% for Bora Bora and Bobo-Dioulasso strains, respectively. This efficacy may be due to its major compounds which are with major compounds as β-caryophyllene, p-cymene, thymol acetate, and 1.8 cineol. Interestingly, on all strains, C8 combination showed a synergistic effect, while C2 showed an additive effect. These combinations exhibit a rate of mortality varying from 80 to 100%. Their toxicity would be due to the major compounds and the putative combined effects of some major and minor compounds. More importanly, L. multiflora EO and combinations of C. nardus and O. americanum EO, may be used as alternatives against pyrethroid resistant of Ae. aegypti.
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Affiliation(s)
- Mahamoudou Balboné
- Laboratoire d'Entomologie Fondamentale et Appliquée, Unité de Formation et de Recherche en Sciences de la Vie et de la Terre (UFR-SVT), Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso
| | - Dieudonné Diloma Soma
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso BP 545, Burkina Faso
| | - Samuel Fogné Drabo
- Laboratoire d'Entomologie Fondamentale et Appliquée, Unité de Formation et de Recherche en Sciences de la Vie et de la Terre (UFR-SVT), Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso
| | - Moussa Namountougou
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso BP 545, Burkina Faso
- Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
| | - Hamadou Konaté
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso BP 545, Burkina Faso
- Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
| | - Georges Benson Meda
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso BP 545, Burkina Faso
| | - Ignace Sawadogo
- Institut de Recherche en Sciences Appliquées et Technologies, Ouagadougou 03 BP 7047, Burkina Faso
| | - Rahim Romba
- Laboratoire d'Entomologie Fondamentale et Appliquée, Unité de Formation et de Recherche en Sciences de la Vie et de la Terre (UFR-SVT), Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso
| | - Etienne Bilgo
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso BP 545, Burkina Faso
| | - Roger C H Nebié
- Institut de Recherche en Sciences Appliquées et Technologies, Ouagadougou 03 BP 7047, Burkina Faso
| | - Imaël H N Bassolé
- Laboratoire d'Entomologie Fondamentale et Appliquée, Unité de Formation et de Recherche en Sciences de la Vie et de la Terre (UFR-SVT), Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso
| | - Roch K Dabire
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso BP 545, Burkina Faso
| | - Olivier Gnankine
- Laboratoire d'Entomologie Fondamentale et Appliquée, Unité de Formation et de Recherche en Sciences de la Vie et de la Terre (UFR-SVT), Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso
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Fofana A, Yerbanga RS, Bilgo E, Ouedraogo GA, Gendrin M, Ouedraogo JB. The Strategy of Paratransgenesis for the Control of Malaria Transmission. Front Trop Dis 2022. [DOI: 10.3389/fitd.2022.867104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Insect-borne diseases are responsible for important burdens on health worldwide particularly in Africa. Malaria alone causes close to half a million deaths every year, mostly in developing, tropical and subtropical countries, with 94% of the global deaths in 2019 occurring in the WHO African region. With several decades, vector control measures have been fundamental to fight against malaria. Considering the spread of resistance to insecticides in mosquitoes and to drugs in parasites, the need for novel strategies to inhibit the transmission of the disease is pressing. In recent years, several studies have focused on the interaction of malaria parasites, bacteria and their insect vectors. Their findings suggested that the microbiota of mosquitoes could be used to block Plasmodium transmission. A strategy, termed paratransgenesis, aims to interfere with the development of malaria parasites within their vectors through genetically-modified microbes, which produce antimalarial effectors inside the insect host. Here we review the progress of the paratransgenesis approach. We provide a historical perspective and then focus on the choice of microbial strains and on genetic engineering strategies. We finally describe the different steps from laboratory design to field implementation to fight against malaria.
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9
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Gnambani EJ, Bilgo E, Sanou A, Dabiré RK, Diabaté A. Infection of highly insecticide-resistant malaria vector Anopheles coluzzii with entomopathogenic bacteria Chromobacterium violaceum reduces its survival, blood feeding propensity and fecundity. Malar J 2020; 19:352. [PMID: 33008454 PMCID: PMC7530970 DOI: 10.1186/s12936-020-03420-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 09/17/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND This is now a concern that malaria eradication will not be achieved without the introduction of novel control tools. Microbiological control might be able to make a greater contribution to vector control in the future. The interactions between bacteria and mosquito make mosquito microbiota really promising from a disease control perspective. Here, the impact of Chromobacterium violaceum infections, isolated from both larvae and adult of wild-caught Anopheles gambiae sensu lato mosquitoes in Burkina Faso, was evaluated on mosquito survival, blood feeding and fecundity. METHODS To assess entomopathogenic effects of C. violaceum infection on mosquitoes, three different types of bioassays were performed in laboratory. These bioassays aimed to evaluate the impact of C. violaceum infection on mosquito survival, blood feeding and fecundity, respectively. During bioassays mosquitoes were infected through the well-established system of cotton ball soaked with 6% glucose containing C. violaceum. RESULTS Chromobacterium violaceum kills pyrethroid resistant Anopheles coluzzii (LT80 of 8.78 days ± 0.18 at 108 bacteria cell/ml of sugar meal). Interestingly, this bacterium had other negative effects on mosquito lifespan by significantly reducing (~ 59%, P < 0.001) the mosquito feeding willingness from day 4-post infection (~ 81% would seek a host to blood feed) to 9- day post infection (22 ± 4.62% would seek a host to blood feed). Moreover, C. violaceum considerably jeopardized the egg laying (~ 16 eggs laid/mosquito with C. violaceum infected mosquitoes vs ~ 129 eggs laid/mosquito with control mosquitoes) and hatching of mosquitoes (a reduction of ~ 22% of hatching rate with C. violaceum infected mosquitoes). Compared to the bacterial uninfected mosquitoes, mosquitoes infected with C. violaceum showed significantly higher retention rates of immature eggs and follicles. CONCLUSION These data showed important properties of Burkina Faso C. violaceum strains, which are highly virulent against insecticide-resistant An. coluzzii, and reduce both mosquito blood feeding and fecundity propensities. However, additional studies as the sequencing of C. violaceum genome and the potential toxins secreted will provide useful information render it a potential candidate for the biological control strategies of malaria and other disease vectors.
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Affiliation(s)
- Edounou Jacques Gnambani
- Institut de Recherche en Sciences de La Santé (IRSS) / Centre Muraz, Bobo Dioulasso, Burkina Faso.,Université Nazi Boni / Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Etienne Bilgo
- Institut de Recherche en Sciences de La Santé (IRSS) / Centre Muraz, Bobo Dioulasso, Burkina Faso.
| | - Adama Sanou
- Université Nazi Boni / Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Roch K Dabiré
- Institut de Recherche en Sciences de La Santé (IRSS) / Centre Muraz, Bobo Dioulasso, Burkina Faso
| | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de La Santé (IRSS) / Centre Muraz, Bobo Dioulasso, Burkina Faso.
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Lovett B, Bilgo E, Diabate A, St Leger R. A review of progress toward field application of transgenic mosquitocidal entomopathogenic fungi. Pest Manag Sci 2019; 75:2316-2324. [PMID: 30801913 DOI: 10.1002/ps.5385] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 02/02/2019] [Accepted: 02/18/2019] [Indexed: 06/09/2023]
Abstract
In Africa, adult mosquito populations are primarily controlled with insecticide-impregnated bed nets and residual insecticide sprays. This coupled with widespread applications of pesticides in agriculture has led to increasing insecticide resistance in mosquito populations. We have developed multiple alternative strategies for exploiting transgenic Metarhizium spp. directed at: (i) shortening the lifespan of adult mosquitoes; (ii) reducing transmission potential of Plasmodium spp.; (iii) reducing vector competence via pre-lethal effects. The present challenge is to convert this promising strategy into a validated public health intervention by resolving outstanding issues related to the release of genetically modified organisms. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Brian Lovett
- Department of Entomology, University of Maryland, College Park, MD, USA
| | - Etienne Bilgo
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Abdoulaye Diabate
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Raymond St Leger
- Department of Entomology, University of Maryland, College Park, MD, USA
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11
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Lovett B, Bilgo E, Millogo SA, Ouattarra AK, Sare I, Gnambani EJ, Dabire RK, Diabate A, St. Leger RJ. Transgenic Metarhizium rapidly kills mosquitoes in a malaria-endemic region of Burkina Faso. Science 2019; 364:894-897. [DOI: 10.1126/science.aaw8737] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 05/07/2019] [Indexed: 11/02/2022]
Abstract
Malaria control efforts require implementation of new technologies that manage insecticide resistance. Metarhizium pingshaense provides an effective, mosquito-specific delivery system for potent insect-selective toxins. A semifield trial in a MosquitoSphere (a contained, near-natural environment) in Soumousso, a region of Burkina Faso where malaria is endemic, confirmed that the expression of an insect-specific toxin (Hybrid) increased fungal lethality and the likelihood that insecticide-resistant mosquitoes would be eliminated from a site. Also, as Hybrid-expressing M. pingshaense is effective at very low spore doses, its efficacy lasted longer than that of the unmodified Metarhizium. Deployment of transgenic Metarhizium against mosquitoes could (subject to appropriate registration) be rapid, with products that could synergistically integrate with existing chemical control strategies to avert insecticide resistance.
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Bilgo E, Vantaux A, Sanon A, Ilboudo S, Dabiré RK, Jacobs-Lorena M, Diabate A. Field assessment of potential sugar feeding stations for disseminating bacteria in a paratransgenic approach to control malaria. Malar J 2018; 17:367. [PMID: 30333029 PMCID: PMC6192189 DOI: 10.1186/s12936-018-2516-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 10/08/2018] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Using bacteria to express and deliver anti-parasite molecules in mosquitoes is among the list of genetic tools to control malaria. The introduction and spread of transgenic bacteria through wild adult mosquitoes is one of the major challenges of this strategy. In prospect of future field experiments, an open field study with blank (without bacteria) attractive sugar bait (ASB) was performed under the assumption that transgenic bacteria would be spread to all sugar fed mosquitoes. METHODS Two types of ASB stations were developed, one with clay pots (CP) placed at mosquito resting sites and one with window entry traps (WET) placed inside inhabited houses. The ASB consisted in either glucose, honey or fruit cocktail solutions. In addition, mark-release-recapture (MRR) experiment of mosquitoes after feeding them with glucose was also conducted to check the proportion of the mosquito population that can be reached by the two ASB stations as well as its suitability to complement the ASB stations for disseminating bacteria. RESULTS Overall, 88% of the mosquitoes were collected in the WET_ASB. The CP_ASB stations were much less attractive with the highest average of 82 ± 11 mosquitoes/day in the CP near the wood piles. The proportions of sugar fed mosquitoes upon ASB were low in both type of ASB stations, ~ 2% and ~ 14% in WET and CP, respectively. Honey solution was the most attractive solution compared to the glucose and the fruit cocktail solutions. The recapture rate in the MRR experiment was low: ~ 4.1% over 7 days. CONCLUSION The WET_ASB looks promising to disseminate transgenic bacteria to endophilic West Africa Anopheles mosquito. However, this feeding station may not be fully effective and could be combined with the CP_ASB to also target outdoor resting mosquitoes. Overall, efforts are needed to improve the mosquito-feeding rates upon ASB.
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Affiliation(s)
- Etienne Bilgo
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso. .,Laboratoire d'Entomologie Fondamentale et Appliqué/UFR-SVT/Université Ouaga I, Pr. Joseph KI-Zerbo, Ouagadougou, Burkina Faso.
| | | | - Antoine Sanon
- Laboratoire d'Entomologie Fondamentale et Appliqué/UFR-SVT/Université Ouaga I, Pr. Joseph KI-Zerbo, Ouagadougou, Burkina Faso
| | - Seni Ilboudo
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Roch K Dabiré
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Marcelo Jacobs-Lorena
- Department of Molecular Microbiology and Immunology, Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA
| | - Abdoulaye Diabate
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
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Bilgo E, Lovett B, Fang W, Bende N, King GF, Diabate A, St Leger RJ. Improved efficacy of an arthropod toxin expressing fungus against insecticide-resistant malaria-vector mosquitoes. Sci Rep 2017; 7:3433. [PMID: 28611355 PMCID: PMC5469824 DOI: 10.1038/s41598-017-03399-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 04/27/2017] [Indexed: 01/21/2023] Open
Abstract
The continued success of malaria control efforts requires the development, study and implementation of new technologies that circumvent insecticide resistance. We previously demonstrated that fungal pathogens can provide an effective delivery system for mosquitocidal or malariacidal biomolecules. Here we compared genes from arthropod predators encoding insect specific sodium, potassium and calcium channel blockers for their ability to improve the efficacy of Metarhizium against wild-caught, insecticide-resistant anophelines. Toxins expressed under control of a hemolymph-specific promoter increased fungal lethality to mosquitoes at spore dosages as low as one conidium per mosquito. One of the most potent, the EPA approved Hybrid (Ca++/K+ channel blocker), was studied for pre-lethal effects. These included reduced blood feeding behavior, with almost 100% of insects infected with ~6 spores unable to transmit malaria within 5 days post-infection, surpassing the World Health Organization threshold for successful vector control agents. Furthermore, recombinant strains co-expressing Hybrid toxin and AaIT (Na+ channel blocker) produced synergistic effects, requiring 45% fewer spores to kill half of the mosquitoes in 5 days as single toxin strains. Our results identify a repertoire of toxins with different modes of action that improve the utility of entomopathogens as a technology that is compatible with existing insecticide-based control methods.
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Affiliation(s)
- Etienne Bilgo
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Brian Lovett
- Department of Entomology, University of Maryland, College Park, Maryland, 20742, USA
| | - Weiguo Fang
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Niraj Bende
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Glenn F King
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Abdoulaye Diabate
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Raymond J St Leger
- Department of Entomology, University of Maryland, College Park, Maryland, 20742, USA.
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Sawadogo SP, Niang A, Bilgo E, Millogo A, Maïga H, Dabire RK, Tripet F, Diabaté A. Targeting male mosquito swarms to control malaria vector density. PLoS One 2017; 12:e0173273. [PMID: 28278212 PMCID: PMC5344402 DOI: 10.1371/journal.pone.0173273] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 02/17/2017] [Indexed: 11/18/2022] Open
Abstract
Malaria control programs are being jeopardized by the spread of insecticide resistance in mosquito vector populations. It has been estimated that the spread of resistance could lead to an additional 120000 deaths per year, and interfere with the prospects for sustained control or the feasibility of achieving malaria elimination. Another complication for the development of resistance management strategies is that, in addition to insecticide resistance, mosquito behavior evolves in a manner that diminishes the impact of LLINs and IRS. Mosquitoes may circumvent LLIN and IRS control through preferential feeding and resting outside human houses and/or being active earlier in the evening before people go to sleep. Recent developments in our understanding of mosquito swarming suggest that new tools targeting mosquito swarms can be designed to cut down the high reproductive rate of malaria vectors. Targeting swarms of major malaria vectors may provide an effective control method to counteract behavioral resistance developed by mosquitoes. Here, we evaluated the impact of systematic spraying of swarms of Anopheles gambiae s.l. using a mixed carbamate and pyrethroid aerosol. The impact of this intervention on vector density, female insemination rates and the age structure of males was measured. We showed that the resulting mass killing of swarming males and some mate-seeking females resulted in a dramatic 80% decrease in population size compared to a control population. A significant decrease in female insemination rate and a significant shift in the age structure of the male population towards younger males incapable of mating were observed. This paradigm-shift study therefore demonstrates that targeting primarily males rather than females, can have a drastic impact on mosquito population.
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Affiliation(s)
- Simon Peguedwinde Sawadogo
- Department of Medical Biology and Public Health, Institut de Recherche en Science de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
- * E-mail:
| | - Abdoulaye Niang
- Department of Medical Biology and Public Health, Institut de Recherche en Science de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Etienne Bilgo
- Department of Medical Biology and Public Health, Institut de Recherche en Science de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Azize Millogo
- Deparment of Population Sciences, Institut des Sciences des Sociétés (INSS), Ouagadougou, Burkina Faso
| | - Hamidou Maïga
- Department of Medical Biology and Public Health, Institut de Recherche en Science de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Roch K. Dabire
- Department of Medical Biology and Public Health, Institut de Recherche en Science de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Frederic Tripet
- Centre for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Staffordshire, United Kingdom
| | - Abdoulaye Diabaté
- Department of Medical Biology and Public Health, Institut de Recherche en Science de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
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Diabaté A, Bilgo E, Dabiré RK, Tripet F. Environmentally friendly tool to control mosquito populations without risk of insecticide resistance: the Lehmann's funnel entry trap. Malar J 2013; 12:196. [PMID: 23758904 PMCID: PMC3701513 DOI: 10.1186/1475-2875-12-196] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 06/03/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Current malaria control strategies have cut down the malaria burden in many endemic areas, however the emergence and rapid spread of insecticide and drug resistance undermine the success of these efforts. There is growing concern that malaria eradication will not be achieved without the introduction of novel control tools. One approach that has been developed in the last few years is based on house screening to reduce indoor mosquito vector densities and consequently decrease malaria transmission. Here screening and trapping were combined in one tool to control mosquito populations. The trap does not require an insecticide or even an attractant, yet it effectively collects incoming resistant and susceptible mosquitoes and kills them. RESULTS Performance of the funnel entry trap was tested in low and high malaria vector density areas. An overall reduction of 70 to 80% of mosquito density was seen in both. Species and molecular forms of Anopheles gambiae identification indicated no variation in the number of Anopheles arabiensis and the molecular forms of An. gambiae between houses and traps. Mosquitoes collected in the traps and in houses were highly resistant to pyrethroids (0.9 kdr-based mechanism). CONCLUSION There is a global consensus that new intervention tools are needed to cross the last miles in malaria elimination/eradication. The funnel entry trap showed excellent promise in suppressing mosquito densities even in area of high insecticide resistance. It requires no chemicals and is self-operated.
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Affiliation(s)
- Abdoulaye Diabaté
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso.
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