Coulibaly F H, Tia E, Yapi Y G, Tia Z I, N'guessan G K D, Fournet F, Hougard J M
Centre d'entomologie médicale et vétérinaire, université Alassane-Ouattara, Bouaké, Côte d'Ivoire.
Institut Pierre-Richet, Institut national de santé publique (INSP), Côte d'Ivoire.
Bull Soc Pathol Exot. 2020;113(2):70-78. doi: 10.3166/bspe-2020-0127.
Malaria remains a public health problem in Côte d'Ivoire despite a 95% coverage rate with long-lasting insecticide-treated mosquito nets (LLINs) since 2015. A study was conducted in Bouaké to determine the residual efficacy of LLINs used during 17 months (N = 30) and of stored and unpacked LLINs (N = 8). The physical integrity of LLINs and their biological efficacy on populations of Anopheles gambiae (sensitive and resistant to insecticides) were assessed. The study revealed that 57% (17/30) of LLINs recovered from households have a hole. The proportional hole indices indicated that 70% (21/30) of LLINs were in good condition, 20% (6/30) were repairable and 10% (3/30) were unusable.This study also showed that the LLINs used and stored were effective on the sensitive Kisumu strain but ineffective on resistant populations of An. gambiae of Bouaké. Average knock-down and mortality rates induced by LLINs used on the populations of An. gambiae from Bouaké were 23% and 9%, respectively. The resistance of mosquitoes to insecticides and the alteration of the physil integrity of mosquito nets are probably major factors to be taken into account in estimating the efficacy of LLINs in the field.
尽管自2015年以来长效驱虫蚊帐（LLINs）的覆盖率达到了95%，但疟疾在科特迪瓦仍是一个公共卫生问题。在布瓦凯进行了一项研究，以确定使用17个月的LLINs（N = 30）以及储存且未包装的LLINs（N = 8）的残留效果。评估了LLINs的物理完整性及其对冈比亚按蚊种群（对杀虫剂敏感和耐药）的生物学效果。研究表明，从家庭中回收的LLINs中有57%（17/30）有一个洞。比例破洞指数表明，70%（21/30）的LLINs状况良好，20%（6/30）可修复，10%（3/30）无法使用。这项研究还表明，使用和储存的LLINs对敏感的基苏木品系有效，但对布瓦凯的耐药冈比亚按蚊种群无效。用于布瓦凯冈比亚按蚊种群的LLINs引起的平均击倒率和死亡率分别为23%和9%。蚊子对杀虫剂的抗性以及蚊帐物理完整性的改变可能是在评估野外LLINs效果时需要考虑的主要因素。
