Large-Scale Deployment of Pyriproxyfen-Treated Lehmann Funnel Entry Traps to Control Malaria Mosquito Populations

2021 ◽  
Author(s):  
Roger Sanou ◽  
Hamidou Maïga ◽  
Bazoumana D. Sow ◽  
Adama Ouema ◽  
Abdoul Azize Millogo ◽  
...  
Keyword(s):  
Large Scale ◽  
Egg Laying ◽  
Community Level ◽  
Hatching Rate ◽  
Female Mosquito ◽  
Mosquito Density ◽  
Malaria Mosquito ◽  
Control Village ◽  
The Impact ◽  
Old Females

Abstract Background: The Lehmann Funnel Entry Trap has proven to be effective in catching and killing up to 70% of mosquitoes even in a high mosquito density setting. A medium-sized prototype was selected and deployed at large scale in Vallée du Kou 3 (VK3) in the Southwest of Burkina Faso to assess its entomological and sociological impact.Method: Overall, 1,313 traps impregnated with Pyriproxyfen (PPF), were deployed. Of them, 12 traps were randomly selected across the intervention village compared to houses without traps in the control village, Vallée du Kou 5 (VK5). Traps were placed at the windows while doors were blocked with curtains. Mosquitoes were collected in traps and matching houses in VK3 and in houses only in VK5, for nine days per month from July to October 2015. Collected mosquitoes were morphologically identified, counted, and preserved in 80% ethanol vials for subsequent analyses, including resistance genes and female mosquito age structure. The impact of the trap on mosquito density at community level was assessed by performing a pyrethrum spray catch (PSC) with bioassays to assess the effect of PPF. Results: Overall mosquito density was reduced by ~90% in all houses equipped with traps in VK3. At the community level, while mosquito density before intervention was 33% higher in VK3 than in VK5, it was 47% higher in VK5 after the intervention. Old female mosquito numbers increased in VK5 by 12% in October but not in VK3, indicating that the traps were cumulatively killing old females. The additional effect of PPF was to limit egg-laying, with a smaller number of eggs counted, and with a low hatching rate. Mosquitoes were highly resistant to pyrethroids with ~0.9 frequency of the kdr mutation. The trap was well accepted by the communities as 85.4% and 93.8% of interviewees in VK3 found the traps reducing mosquito bites with peaceful sleep respectively. Conclusion: The Lehmann Funnel Entry Trap has real potential to control malaria mosquito populations and can be widely used to sustain the global effort of malaria elimination.

scholarly journals Infection of highly insecticide-resistant malaria vector Anopheles coluzzii with entomopathogenic bacteria Chromobacterium violaceum reduces its survival, blood feeding propensity and fecundity

2020 ◽  
Author(s):  
Edounou Jacques Gnambani ◽  
Etienne Bilgo ◽  
Adama Sanou ◽  
Roch K. Dabire ◽  
Abdoulaye Diabate
Keyword(s):  
Burkina Faso ◽  
Post Infection ◽  
Blood Feeding ◽  
Egg Laying ◽  
Chromobacterium Violaceum ◽  
Hatching Rate ◽  
Anopheles Coluzzii ◽  
Potential Candidate ◽  
Mosquito Survival ◽  
The Impact

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, we studied the impact of Chromobacterium violaceum infections isolated from both larvae and adult of wild caught Anopheles gambiae s.l. mosquitoes in Burkina Faso on mosquito survival, blood feeding and fecundity propensy. 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 C. violaceum kills pyrethroid resistant mosquitoes An. coluzzii (LT80 of 8.78 days ± 0.18 at 10 8 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 /mosquitoes with C. violaceum infected mosquitoes vs ~129 eggs laid / mosquitoes 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 indeed 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 Anopheles 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 certainly provide useful information render it a potential candidate for the biological control strategies of malaria and other disease vectors.

scholarly journals Experimental illumination of natural habitat—an experimental set-up to assess the direct and indirect ecological consequences of artificial light of different spectral composition

2015 ◽  
Vol 370 (1667) ◽  
pp. 20140129 ◽  
Author(s):  
Kamiel Spoelstra ◽  
Roy H. A. van Grunsven ◽  
Maurice Donners ◽  
Phillip Gienapp ◽  
Martinus E. Huigens ◽  
...  
Keyword(s):  
Large Scale ◽  
Negative Impact ◽  
Natural Habitat ◽  
Spectral Composition ◽  
Community Level ◽  
Artificial Light ◽  
Night Time ◽  
Natural Habitats ◽  
Set Up ◽  
The Impact

Artificial night-time illumination of natural habitats has increased dramatically over the past few decades. Generally, studies that assess the impact of artificial light on various species in the wild make use of existing illumination and are therefore correlative. Moreover, studies mostly focus on short-term consequences at the individual level, rather than long-term consequences at the population and community level—thereby ignoring possible unknown cascading effects in ecosystems. The recent change to LED lighting has opened up the exciting possibility to use light with a custom spectral composition, thereby potentially reducing the negative impact of artificial light. We describe here a large-scale, ecosystem-wide study where we experimentally illuminate forest-edge habitat with different spectral composition, replicated eight times. Monitoring of species is being performed according to rigid protocols, in part using a citizen-science-based approach, and automated where possible. Simultaneously, we specifically look at alterations in behaviour, such as changes in activity, and daily and seasonal timing. In our set-up, we have so far observed that experimental lights facilitate foraging activity of pipistrelle bats, suppress activity of wood mice and have effects on birds at the community level, which vary with spectral composition. Thus far, we have not observed effects on moth populations, but these and many other effects may surface only after a longer period of time.

scholarly journals Infection of highly insecticide-resistant malaria vector Anopheles coluzzii with entomopathogenic bacteria Chromobacterium violaceum reduces its survival, blood feeding propensity and fecundity

2020 ◽  
Author(s):  
Edounou Jacques Gnambani ◽  
Etienne Bilgo ◽  
Adama Sanou ◽  
Roch K. Dabire ◽  
Abdoulaye Diabate
Keyword(s):  
Burkina Faso ◽  
Post Infection ◽  
Blood Feeding ◽  
Egg Laying ◽  
Chromobacterium Violaceum ◽  
Hatching Rate ◽  
Anopheles Coluzzii ◽  
Potential Candidate ◽  
Mosquito Survival ◽  
The Impact

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, we studied the impact of Chromobacterium violaceum infections isolated from both larvae and adult of wild caught Anopheles gambiae s.l. mosquitoes in Burkina Faso on mosquito survival, blood feeding and fecundity propensy. 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 C. violaceum kills pyrethroid resistant mosquitoes An. 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 /mosquitoes with C. violaceum infected mosquitoes vs ~129 eggs laid / mosquitoes 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 indeed 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 Anopheles 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 certainly provide useful information render it a potential candidate for the biological control strategies of malaria and other disease vectors.

scholarly journals Assessment of novel Lehmann’s Funnel Entry Trap prototypes performance to control malaria mosquito populations

2020 ◽  
Author(s):  
Roger Sanou ◽  
Hamidou Maïga ◽  
Etienne M. Bilgo ◽  
P. Simon Sawadogo ◽  
Bazoumana D. Sow ◽  
...  
Keyword(s):  
Malaria Vector ◽  
Large Scale ◽  
The Other ◽  
Malaria Vectors ◽  
Mosquito Density ◽  
Malaria Mosquito ◽  
Killing Effect ◽  
Global Consensus ◽  
Community Acceptance ◽  
Study Sites

Abstract BackgroundThere is a global consensus that new intervention tools are needed to make the final steps toward malaria elimination/eradication. In a recent study in Burkina Faso, the Lehmann Funnel Entry Trap (LFET) has shown promising results in the reduction of mosquito densities, even in areas where insecticide resistance is as high as 80%. The LFET requires no chemicals and is self-operated. However, one of the issues with the original LFET is the size of the funnel, which often occupies too much space within users’ homes. Here, we compared the performance of three new, smaller-sized LFET prototypes that combine a screening and killing effect on mosquitoes. MethodsThe study was carried out over three months during the rainy season in low and high malaria vector density sites, Soumousso and Vallée du Kou, respectively. The original LFET (or ‘Prototype 1’/’P1’) was modified to produce three new prototypes, which we will refer to as Prototype 2 (‘the Medium’ or ‘P2’), Prototype 3 (P3) and Prototype 4 (P4). Each of the new prototypes was tested on eight days per month over the three-month period to assess their effectiveness in trapping and killing mosquitoes entering houses through the windows compared to the original LFET. ResultsOverall, 78,435 mosquitoes (mainly Anopheles gambiae s.l.) were collected in the two study sites, both in the traps and in the houses. A total of 56,430 (72%) mosquitoes were collected from the traps. In Vallée du Kou, the original LFET caught a greater number of mosquitoes than the Medium (prototype 2), whereas no difference was observed between the other new prototypes (3 and 4) and the Medium. In Soumousso, the original and Medium LFETs both collected significantly greater numbers of mosquitoes compared to prototypes 3 and 4. ConclusionThis study has shown that the new LFET prototypes are effective in trapping mosquitoes in high mosquito density settings. A large-scale study with one of the prototypes will be needed to assess community acceptance of the traps and their ability to control malaria vectors.

scholarly journals Infection of highly insecticide-resistant malaria vector Anopheles coluzzii with entomopathogenic bacteria Chromobacterium violaceum reduces its survival, blood feeding propensity and fecundity

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Edounou Jacques Gnambani ◽  
Etienne Bilgo ◽  
Adama Sanou ◽  
Roch K. Dabiré ◽  
Abdoulaye Diabaté
Keyword(s):  
Burkina Faso ◽  
Post Infection ◽  
Blood Feeding ◽  
Egg Laying ◽  
Chromobacterium Violaceum ◽  
Hatching Rate ◽  
Anopheles Coluzzii ◽  
Potential Candidate ◽  
Mosquito Survival ◽  
The Impact

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.

scholarly journals Giardia duodenalis infection in the context of a community-based deworming and water, sanitation and hygiene trial in Timor-Leste

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Jessica Y. H. Aw ◽  
Naomi E. Clarke ◽  
James S. McCarthy ◽  
Rebecca J. Traub ◽  
Salvador Amaral ◽  
...  
Keyword(s):  
Low Income ◽  
Large Scale ◽  
Giardia Duodenalis ◽  
Community Level ◽  
Trial Registration ◽  
Low Income Countries ◽  
Secondary Outcome ◽  
Sanitation And Hygiene ◽  
Timor Leste ◽  
The Impact

Abstract Background Giardiasis is a common diarrhoeal disease caused by the protozoan Giardia duodenalis. It is prevalent in low-income countries in the context of inadequate access to water, sanitation and hygiene (WASH), and is frequently co-endemic with neglected tropical diseases such as soil-transmitted helminth (STH) infections. Large-scale periodic deworming programmes are often implemented in these settings; however, there is limited evidence for the impact of regular anthelminthic treatment on G. duodenalis infection. Additionally, few studies have examined the impact of WASH interventions on G. duodenalis. Methods The WASH for WORMS cluster randomised controlled trial was conducted in remote communities in Manufahi municipality, Timor-Leste, between 2012 and 2016. All study communities received four rounds of deworming with albendazole at six-monthly intervals. Half were randomised to additionally receive a community-level WASH intervention following study baseline. We measured G. duodenalis infection in study participants every six months for two years, immediately prior to deworming, as a pre-specified secondary outcome of the trial. WASH access and behaviours were measured using questionnaires. Results There was no significant change in G. duodenalis prevalence in either study arm between baseline and the final study follow-up. We found no additional benefit of the community-level WASH intervention on G. duodenalis infection (relative risk: 1.05, 95% CI: 0.72–1.54). Risk factors for G. duodenalis infection included living in a household with a child under five years of age (adjusted odds ratio, aOR: 1.35, 95% CI: 1.04–1.75), living in a household with more than six people (aOR: 1.32, 95% CI: 1.02–1.72), and sampling during the rainy season (aOR: 1.23, 95% CI: 1.04–1.45). Individuals infected with the hookworm Necator americanus were less likely to have G. duodenalis infection (aOR: 0.71, 95% CI: 0.57–0.88). Conclusions Prevalence of G. duodenalis was not affected by a community WASH intervention or by two years of regular deworming with albendazole. Direct household contacts appear to play a dominant role in driving transmission. We found evidence of antagonistic effects between G. duodenalis and hookworm infection, which warrants further investigation in the context of global deworming efforts. Trial registration Australian New Zealand Clinical Trials Registry, ACTRN12614000680662. Registered 27 June 2014, retrospectively registered. https://anzctr.org.au/Trial/Registration/TrialReview.aspx?id=366540.

scholarly journals Assessment of novel Lehmann’s Funnel Entry Trap prototypes performance to control malaria mosquito populations

2020 ◽  
Author(s):  
Roger Sanou ◽  
Hamidou Maïga ◽  
Etienne M. Bilgo ◽  
Simon P. Sawadogo ◽  
Bazoumana D. Sow ◽  
...  
Keyword(s):  
Large Scale ◽  
The Other ◽  
Malaria Vectors ◽  
Mosquito Density ◽  
Malaria Mosquito ◽  
Killing Effect ◽  
Global Consensus ◽  
Community Acceptance ◽  
Anopheles Gambiae S.L ◽  
Study Sites

Abstract Background: There is a global consensus that new intervention tools are needed to make the final steps toward malaria elimination/eradication. In a recent study in Burkina Faso, the Lehmann Funnel Entry Trap (LFET) has shown promising results in the reduction of mosquito densities, even in areas where insecticide resistance is as high as 80%. The LFET requires no chemicals and is self-operated. However, one of the issues with the original LFET is the size of the funnel, which often occupies too much space within users’ homes. Here, we compared the performance of three new, smaller-sized LFET prototypes that combine a screening and killing effect on mosquitoes. Methods: The study was carried out over three months during the rainy season in low and high malaria vector density sites, Soumousso and Vallée du Kou, respectively. The original LFET (or ‘Prototype 1’/’P1’) was modified to produce three new prototypes, which we will refer to as Prototype 2 (‘the Medium’ or ‘P2’), Prototype 3 (P3) and Prototype 4 (P4). Each of the new prototypes was tested on eight days per month over the three-month period to assess their effectiveness in trapping and killing mosquitoes entering houses through the windows compared to the original LFET. Results: Overall, 78,435 mosquitoes (mainly Anopheles gambiae s.l.) were collected in the two study sites, both in the traps and in the houses. A total of 56,430 (72%) mosquitoes were collected from the traps. In Vallée du Kou, the original LFET caught a greater number of mosquitoes than the Medium (prototype 2), whereas no difference was observed between the other new prototypes (3 and 4) and the Medium. In Soumousso, both the original and Medium LFETs collected significantly greater numbers of mosquitoes compared to prototypes 3 and 4. Conclusion: This study has shown that the new LFET prototypes are effective in trapping mosquitoes in high mosquito density settings. A large-scale study with one of the prototypes will be needed to assess community acceptance of the traps and their ability to control malaria vectors.

scholarly journals Assessment of novel Lehmann’s funnel entry trap prototypes performance to control malaria mosquito populations

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Roger Sanou ◽  
Hamidou Maïga ◽  
Etienne M. Bilgo ◽  
Simon P. Sawadogo ◽  
Bazoumana B. D. Sow ◽  
...  
Keyword(s):  
Malaria Vector ◽  
Large Scale ◽  
The Other ◽  
Malaria Vectors ◽  
Mosquito Density ◽  
Malaria Mosquito ◽  
Killing Effect ◽  
Global Consensus ◽  
Community Acceptance ◽  
Study Sites

Abstract Background There is a global consensus that new intervention tools are needed for the final steps toward malaria elimination/eradication. In a recent study in Burkina Faso, the Lehmann Funnel Entry Trap (LFET) has shown promising results in the reduction of mosquito densities, even in areas where insecticide resistance is as high as 80%. The LFET requires no chemicals and is self-operated. However, one of the issues with the original LFET is the size of the funnel, which often occupies too much space within users’ homes. Here, the performance of three new, smaller-sized LFET prototypes that combine a screening and killing effect on mosquitoes was assessed. Methods The study was carried out over three months during the rainy season in low and high malaria vector density sites, Soumousso and Vallée du Kou, respectively. The original LFET (or ‘Prototype 1’/‘P1’) was modified to produce three new prototypes, which were referred to as prototype 2 (‘the Medium’ or ‘P2’), prototype 3 (P3) and prototype 4 (P4). Each of the new prototypes was tested on eight days per month over the three-month period to assess their effectiveness in trapping and killing mosquitoes entering houses through the windows compared to the original LFET. Results Overall, 78,435 mosquitoes (mainly Anopheles gambiae sensu lato) were collected in the two study sites, both in the traps and in the houses. A total of 56,430 (72%) mosquitoes were collected from the traps. In Vallée du Kou, the original LFET caught a greater number of mosquitoes than the medium (prototype 2), whereas no difference was observed between the other new prototypes (3 and 4) and the medium. In Soumousso, both the original and medium LFETs collected significantly greater numbers of mosquitoes compared to prototypes 3 and 4. Conclusion This study has shown that the new LFET prototypes are effective in trapping mosquitoes in high mosquito density settings. A large-scale study with one of the prototypes will be needed to assess community acceptance of the traps and their ability to control malaria vectors.

scholarly journals Creating pathways to integration: The impact of community-based intervention in Gugulethu

2017 ◽  
Author(s):  
Sean Michael Larner
Keyword(s):  
Civil Society ◽  
Large Scale ◽  
Community Level ◽  
Socially Responsible ◽  
Community Based ◽  
Correctional Services ◽  
Civil Society Organisations ◽  
The Future ◽  
The Impact

Section 36 of the Correctional Services Act describes the purpose of imprisonment as “enabling the sentenced prisoner to lead a socially responsible and crime-free life in the future.” But interviews with 48 young ex-prisoners in Gugulethu revealed a stark discrepancy between rhetoric and reality. Analysis outlined obstacles to integration, both psycho-social and material in nature, which community-level organizations were unable to fix on their own. To construct viable pathways to integration, and satisfy its legislative mandate, the Department of Correctional Services (DCS) must initiate large-scale coordination with civil society organisations. 

scholarly journals Infection of highly insecticide-resistant malaria vector Anopheles coluzzii with entomopathogenic bacteria Chromobacterium violaceum reduces its survival, blood feeding propensity and fecundity

2020 ◽  
Author(s):  
Edounou Jacques Gnambani ◽  
Etienne Bilgo ◽  
Adama Sanou ◽  
Roch K. Dabire ◽  
Abdoulaye Diabate
Keyword(s):  
Burkina Faso ◽  
Post Infection ◽  
Blood Feeding ◽  
Egg Laying ◽  
Chromobacterium Violaceum ◽  
Hatching Rate ◽  
Anopheles Coluzzii ◽  
Potential Candidate ◽  
Mosquito Survival ◽  
The Impact

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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