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anopheles gambiae sensu lato

Evaluation of the interaction between insecticide resistance-associated genes and malaria transmission in Anopheles gambiae sensu lato in central Cote d'Ivoire

November 27, 2021 - 13:06 -- Open Access
Wolie RZ, Koffi AA, NGuessan R, et al.
Parasit Vectors. 2021 Nov 20;14(1):581

There is evidence that the knockdown resistance gene (Kdr) L1014F and acetylcholinesterase-1 gene (Ace-1R) G119S mutations involved in pyrethroid and carbamate resistance in Anopheles gambiae influence malaria transmission in sub-Saharan Africa. This is likely due to changes in the behaviour, life history and vector competence and capacity of An. gambiae. In the present study, performed as part of a two-arm cluster randomized controlled trial evaluating the impact of household screening plus a novel insecticide delivery system (In2Care Eave Tubes), we investigated the distribution of insecticide target site mutations and their association with infection status in wild An. gambiae sensu lato (s.l.) populations.

Risk factors associated with house entry of malaria vectors in an area of Burkina Faso with high, persistent malaria transmission and high insecticide resistance

October 23, 2021 - 18:34 -- Open Access
Jean Baptiste Yaro, Alfred B. Tiono, Anne L. Wilson, et al.
Malaria Journal 2021 20:397, 10 October 2021

In rural Burkina Faso, the primary malaria vector Anopheles gambiae sensu lato (s.l.) primarily feeds indoors at night. Identification of factors which influence mosquito house entry could lead to development of novel malaria vector control interventions. A study was therefore carried out to identify risk factors associated with house entry of An. gambiae s.l. in south-west Burkina Faso, an area of high insecticide resistance.

Predatory and competitive interaction in Anopheles gambiae sensu lato larval breeding habitats in selected villages of central Uganda

August 25, 2021 - 15:57 -- Open Access
Onen H, Odong R, Chemurot M, Tripet F, Kayondo JK
Parasit Vectors. 2021 Aug 21;14(1):420

Malaria is often persistent in communities surrounded by mosquito breeding habitats. Anopheles gambiae sensu lato exploit a variety of aquatic habitats, but the biotic determinants of its preferences are poorly understood. This study aimed to identify and quantify macroinvertebrates in different habitat types with determined water physico-chemical parameters to establish those preferred by An. gambiae s.l. larvae as well as their predators and competitors.

Determination of the discriminating concentration of chlorfenapyr (pyrrole) and Anopheles gambiae sensu lato susceptibility testing in preparation for distribution of Interceptor® G2 insecticide-treated nets

July 21, 2021 - 17:51 -- Open Access
Richard M. Oxborough, Aklilu Seyoum, Dereje Dengela, et al.
Malaria Journal 2021 20:316, 14 July 2021

Following agricultural use and large-scale distribution of insecticide-treated nets (ITNs), malaria vector resistance to pyrethroids is widespread in sub-Saharan Africa. Interceptor® G2 is a new dual active ingredient (AI) ITN treated with alpha-cypermethrin and chlorfenapyr for the control of pyrethroid-resistant malaria vectors. In anticipation of these new nets being more widely distributed, testing was conducted to develop a chlorfenapyr susceptibility bioassay protocol and gather susceptibility information.

Multiple Resistance Mechanisms to Pyrethroids Insecticides in Anopheles gambiae sensu lato Population From Mali, West Africa

April 29, 2021 - 07:16 -- Open Access
Keïta M, Sogoba N, Kané F, Traoré B, Zeukeng F, Coulibaly B, Sodio AB, Traoré SF, Djouaka R, Doumbia S
J Infect Dis. 2021 Apr 27;223(Supplement_2):S81-S90

Insecticide-based vector control is responsible for reducing malaria mortality and morbidity. Its success depends on a better knowledge of the vector, its distribution, and resistance status to the insecticides used. In this paper, we assessed Anopheles gambiae sensu lato (A gambiae s.l.) population resistance to pyrethroids in different ecological settings.

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

January 6, 2021 - 11:38 -- Open Access
Roger Sanou, Hamidou Maïga, Etienne M. Bilgo, Simon P. Sawadogo, Bazoumana B. D. Sow, Adama Ouema, Koama Bayili, Adrien Marie Gaston Belem, Léa Paré Toé, Roch K. Dabiré and Abdoulaye Diabaté
Malaria Journal 2021 20:2, 1 January 2021

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.

Indoor spraying with chlorfenapyr (a pyrrole insecticide) provides residual control of pyrethroid-resistant malaria vectors in southern Benin

July 14, 2020 - 09:47 -- Open Access
Corine Ngufor, Augustin Fongnikin, Neil Hobbs, Martial Gbegbo, Laurette Kiki, Abibath Odjo, Martin Akogbeto and Mark Rowland
Malaria Journal 2020 19:249, 13 July 2020

New classes of insecticides with novel modes of action, which can provide effective and prolonged control of insecticide-resistant malaria vector populations, are urgently needed for indoor residual spraying. Such insecticides can be included in a rotation plan to manage and prevent further development of resistance in mosquito vectors of malaria. Chlorfenapyr, a novel pyrrole insecticide with a unique mode of action, is being developed as a long-lasting IRS formulation.

Semi-field studies to better understand the impact of eave tubes on mosquito mortality and behaviour

August 22, 2018 - 15:09 -- Open Access
Antoine M. G. Barreaux, N’Guessan Brou, Alphonsine A. Koffi, Raphaël N’Guessan, Welbeck A. Oumbouke, Innocent Z. Tia and Matthew B. Thomas
Malaria Journal 2018 17:306, 22 August 2018

Eave tubes are a potentially effective way to target Anopheles mosquitoes with insecticides.

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