Entomological monitoring data driving decision-making for appropriate and sustainable malaria vector control in Côte d’Ivoire

Malaria Journal

Research

Emmanuel Tia¹  Roseline Monsan Yapo¹  Maurice Adja Akré²  Alphonsine Amanan Koffi²  Lucien Yao Konan³  Roméo N’Tamon N’Tamon³  Antoine Mea Tanoh⁴  Joseph Chabi⁵  Cecilia Flatley⁵  Bernard Loukou Kouassi⁶  Ndombour Gning Cissé⁶  Constant Guy N’Guessan Gbalegba⁷  Constant Edi⁸  Janice Gouaméné⁸  Armand Kouassi Ekra⁸  Armel-Hermann Obo Béké⁸  Louise Golou Bellai⁸  Yves Alain Kadio Kacou⁸  Firmain N’Dri Yokoli⁸  Jackson Koffi Ives Kouamé⁸  Allassane Foungoye Ouattara⁸  Patricia L. Yepassis-Zembrou⁹  Seth R. Irish^1,10  Pascal Zinzindohoué^1,11  Blaise Kouadio^1,11  Allison Belemvire^1,12 

[1] Centre of Veterinary and Medical Entomology, Abidjan, Côte d’Ivoire;National Institute of Public Health/Pierre Richet Institute, Bouake, Côte d’Ivoire;National Institute of Public Hygiene, Abidjan, Côte d’Ivoire;National Malaria Control Programme, Abidjan, Côte d’Ivoire;PMI VectorLink Project, Washington, DC, USA;PMI VectorLink project, Abidjan, Côte d’Ivoire;PMI VectorLink project, Abidjan, Côte d’Ivoire;National Malaria Control Programme, Abidjan, Côte d’Ivoire;Swiss Centre of Scientific Research in Côte d’Ivoire, Abidjan, Côte d’Ivoire;U.S. President’s Malaria Initiative, Centers for Disease Control and Prevention (CDC), Abidjan, Côte d’Ivoire;U.S. President’s Malaria Initiative, Entomology Branch, U.S. Centers for Disease Control and Prevention (CDC), Atlanta, GA, USA;U.S. President’s Malaria Initiative, USAID, Abidjan, Côte d’Ivoire;U.S. President’s Malaria Initiative, USAID, Washington, DC, USA;

关键词: Malaria;    Anopheles gambiae;    Insecticide resistance monitoring;    Vector bionomics;    ITNs;    IRS;    Decision-making;    Côte d’Ivoire;   

DOI  :  10.1186/s12936-023-04439-z

 received in 2022-09-28, accepted in 2023-01-03,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundEntomological surveillance provides critical information on vectors for appropriate malaria vector control and strategic decision-making. The widely documented insecticide resistance of malaria vectors in Côte d’Ivoire requires that any vector control intervention deployment be driven by entomological data to optimize its effectiveness and appropriate resource allocations.To achieve this goal, this study documents the results of monthly vector surveillance and insecticide susceptibility tests conducted in 2019 and a review of all previous entomological monitoring data used to guide vector control decision making. Furthermore, susceptibility to pirimiphos-methyl and clothianidin was assessed in addition to chlorfenapyr and pyrethroids (intensity and piperonyl butoxide (PBO) synergism) tests previously reported. Vector bionomic data were conducted monthly in four sites (Sakassou, Béoumi, Dabakala and Nassian) that were selected based on their reported high malaria incidence. Adult mosquitoes were collected using human landing catches (HLCs), pyrethrum spray catches (PSCs), and human-baited CDC light traps to assess vector density, behaviour, species composition and sporozoite infectivity.ResultsPirimiphos-methyl and clothianidin susceptibility was observed in 8 and 10 sites, respectively, while previous data reported chlorfenapyr (200 µg/bottle) susceptibility in 13 of the sites, high pyrethroid resistance intensity and increased mortality with PBO pre-exposure at all 17 tested sites.Anopheles gambiae sensu lato was the predominant malaria vector collected in all four bionomic sites. Vector density was relatively higher in Sakassou throughout the year with mean biting rates of 278.2 bites per person per night (b/p/n) compared to Béoumi, Dabakala and Nassian (mean of 48.5, 81.4 and 26.6 b/p/n, respectively). The mean entomological inoculation rate (EIR) was 4.44 infective bites per person per night (ib/p/n) in Sakassou, 0.34 ib/p/n in Beoumi, 1.17 ib/p/n in Dabakala and 1.02 ib/p/n in Nassian. The highest EIRs were recorded in October in Béoumi (1.71 ib/p/n) and Nassian (3.22 ib/p/n), in July in Dabakala (4.46 ib/p/n) and in May in Sakassou (15.6 ib/p/n).ConclusionBased on all results and data review, the National Malaria Control Programme developed and implemented a stratified insecticide-treated net (ITN) mass distribution in 2021 considering new generation ITNs. These results also supported the selection of clothianidin-based products and an optimal spraying time for the first indoor residual spraying (IRS) campaign in Sakassou and Nassian in 2020.

【 授权许可】

CC BY   
© The Author(s) 2023

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