[An experimental tool essential for the evaluation of insecticides: the testing huts]

Area of Science:

• Medical entomology
• Vector control research
• Insecticide efficacy testing

Context:

• The M'be Valley experimental huts in Côte d'Ivoire have been used for years to evaluate insecticide products.
• Testing insecticide efficacy requires understanding Anopheles gambiae sensitivity to different insecticide classes.
• WHOPES (World Health Organization Pesticide Evaluation Scheme) protocols guide stage 2 assay methodologies.

Purpose:

• To analyze the potential of experimental huts for evaluating insecticides against Anopheles gambiae.
• To compare the efficacy of house spraying with fipronil and lambda-cyhalothrin-impregnated bednets against Anopheles gambiae.
• To assess the impact of these interventions on mosquito exophily, blood-feeding rates, and mortality.

Summary:

• Fipronil house spraying (100 mg a.i./m2) showed no repellent effect but increased exophily, reducing blood-feeding to 24% and causing 38% mortality (delayed).
• Lambda-cyhalothrin-impregnated bednets (15 mg a.i./m2) reduced Anopheles gambiae entry by 68%, doubled exophily, reduced blood-feeding to 47%, and achieved 35% mortality (two-thirds immediate).
• Experimental huts provided crucial data for selecting effective Anopheles gambiae insecticides.

Impact:

• Experimental huts in M'be Valley yield vital data for selecting effective insecticides against Anopheles gambiae.
• The study highlights the effectiveness of both fipronil house spraying and lambda-cyhalothrin bednets in controlling malaria vectors.
• Recommends extending this experimental hut methodology to other sites for developing targeted mosquito control strategies.