Semi-field evaluation of the cumulative effects of a "Lethal House Lure" on malaria mosquito mortality

Barreaux Antoine, Oumbouke Welbeck A., Tia Innocent Zran, Brou N'Guessan, Koffi Alphonsine A., N'Guessan Raphaël, Thomas Matthew B.. 2019. Semi-field evaluation of the cumulative effects of a "Lethal House Lure" on malaria mosquito mortality. Malaria Journal, 18:298, 9 p.

Url - jeu de données - Entrepôt autre : https://figshare.com/articles/dataset/MOESM1_of_Semi-field_evaluation_of_the_cumulative_effects_of_a_Lethal_House_Lure_on_malaria_mosquito_mortality/9755999

Quartile : Q1, Sujet : TROPICAL MEDICINE / Quartile : Q2, Sujet : PARASITOLOGY / Quartile : Q3, Sujet : INFECTIOUS DISEASES

Résumé : Background: There is growing interest in the potential to modify houses to target mosquitoes with insecticides or repellents as they search for human hosts. One version of this 'Lethal House Lure' approach is the In2Care® EaveTube, which consists of a section of polyvinyl chloride (PVC) pipe fitted into a closed eave, with an insert comprising electrostatic netting treated with insecticide powder placed inside the tube. Preliminary evidence suggests that when combined with screening of doors and windows, there is a reduction in entry of mosquitoes and an increase in mortality. However, the rate of overnight mortality remains unclear. The current study used a field enclosure built around experimental huts to investigate the mortality of cohorts of mosquitoes over multiple nights. Methods: Anopheles gambiae sensu lato mosquitoes were collected from the field as larvae and reared through to adult. Three-to-five days old adult females were released inside an enclosure housing two modified West African style experimental huts at a field site in M'be, Côte d'Ivoire. Huts were either equipped with insecticide-treated tubes at eave height and had closed windows (treatment) or had open windows and open tubes (controls). The number of host-seeking mosquitoes entering the huts and cumulative mortality were monitored over 2 or 4 days. Results: Very few (0–0.4%) mosquitoes were able to enter huts fitted with insecticide-treated tubes and closed windows. In contrast, mosquitoes continually entered the control huts, with a cumulative mean of 50–80% over 2 to 4 days. Baseline mortality with control huts was approximately 2–4% per day, but the addition of insecticide-treated tubes increased mortality to around 25% per day. Overall cumulative mortality was estimated to be up to 87% over 4 days when huts were fitted with tubes. Conclusion: Only 20–25% of mosquitoes contacted insecticide-treated tubes or entered control huts in a given night. However, mosquitoes continue to host search over sequential nights, and this can lead to high cumulative mortality over 2 to 4 days. This mortality should contribute to community-level reduction in transmission assuming sufficient coverage of the intervention.

Mots-clés Agrovoc : malaria, Anopheles gambiae, mortalité, épidémiologie, insecticide, comportement alimentaire, Culicidae, vecteur de maladie, Anopheles

Mots-clés géographiques Agrovoc : Côte d'Ivoire

Mots-clés libres : Vector control, Housing improvement, Mosquito entry, Anopheles gambiae, Window Screening, Lethal house lure, Cumulative mortality, Feeding rate, Eave tubes

Agences de financement hors UE : Bill and Melinda Gates Foundation, U.S. Department of Agriculture

Auteurs et affiliations

• Barreaux Antoine, Pennsylvania State University (USA) ORCID: 0000-0001-5822-761X - auteur correspondant
• Oumbouke Welbeck A., IPR (CIV)
• Tia Innocent Zran, IPR (CIV)
• Brou N'Guessan, IPR (CIV)
• Koffi Alphonsine A., IPR (CIV)
• N'Guessan Raphaël, IPR (CIV)
• Thomas Matthew B., Pennsylvania State University (USA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/609724/)

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