Impact of long-lasting, insecticidal nets on anaemia and prevalence of Plasmodium falciparum among children under five years in areas with highly resistant malaria vectors

Malaria Journal

Research

Immo Kleinschmidt¹  Virgile Gnanguenon²  Arthur Sovi²  Martin C Akogbeto²  Razaki Ossè²  Adicath Adéola Adéothy³  Achille Massougbodji³  Yolande Sissinto³  Abel Wakpo³  Aurore Hounto Ogouyémi³  Sylvie Cornélie⁴  Dorothée Kinde-Gazard⁵  Mariam Oke⁶  Filémon T Tokponnon⁷  Dina Gbénou⁸ 

[1] Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK;Faculte des Sciences et Techniques de l’Université d’Abomey-Calavi, Calavi, Benin;Centre de Recherche Entomologique de Cotonou (CREC), Cotonou, Benin;Faculté des Sciences de la Santé de l’Université d’Abomey Calavi, Calavi, Benin;Institut de Recherche pour le Développement, MIVEGEC, UM1-CNRS 5290-IRD 224, Cotonou, Benin;Ministry of Health, Cotonou, Benin;National Malaria Control Programme, Cotonou, Benin;Ministry of Health, Cotonou, Benin;National Malaria Control Programme, Cotonou, Benin;Ministry of Health, Cotonou, Benin;Faculte des Sciences et Techniques de l’Université d’Abomey-Calavi, Calavi, Benin;Centre de Recherche Entomologique de Cotonou (CREC), Cotonou, Benin;World Health Organization, Cotonou, Benin;

关键词: Malaria;    Plasmodium falciparum;    Anaemia;    Resistance;    LLINs;   

DOI  :  10.1186/1475-2875-13-76

 received in 2013-12-16, accepted in 2014-02-23,  发布年份 2014

来源: Springer

【 摘 要 】

BackgroundThe widespread use of insecticide-treated nets (LLINs) leads to the development of vector resistance to insecticide. This resistance can reduce the effectiveness of LLIN-based interventions and perhaps reverse progress in reducing malaria morbidity. To prevent such difficulty, it is important to know the real impact of resistance in the effectiveness of mosquito nets. Therefore, an assessment of LLIN efficacy was conducted in malaria prevention among children in high and low resistance areas.MethodsThe study was conducted in four rural districts and included 32 villages categorized as low or high resistance areas in Plateau Department, south-western Benin. Larvae collection was conducted to measure vector susceptibility to deltamethrin and knockdown resistance (kdr) frequency. In each resistance area, around 500 children were selected to measure the prevalence of malaria infection as well as the prevalence of anaemia associated with the use of LLINs.ResultsObserved mortalities of Anopheles gambiae s.s population exposed to deltamethrin ranged from 19 to 96%. Knockdown resistance frequency was between 38 and 84%. The prevalence of malaria infection in children under five years was 22.4% (19.9-25.1). This prevalence was 17.3% (14.2-20.9) in areas of high resistance and 27.1% (23.5-31.1) in areas of low resistance (p = 0.04). Eight on ten children that were aged six - 30 months against seven on ten of those aged 31–59 months were anaemic. The anaemia observed in the six to 30-month old children was significantly higher than in the 31–59 month old children (p = 0.00) but no difference associated with resistance areas was observed (p = 0.35). The net use rate was 71%. The risk of having malaria was significantly reduced (p < 0.05) with LLIN use in both low and high resistance areas. The preventive effect of LLINs in high resistance areas was 60% (95% CI: 40–70), and was significantly higher than that observed in low resistance areas (p < 0.05).ConclusionThe results of this study showed that the resistance of malaria vectors seems to date not have affected the impact of LLINs and the use of LLINs was highly associated with reduced malaria prevalence irrespective of resistance.

【 授权许可】

CC BY   
© Tokponnon et al.; licensee BioMed Central Ltd. 2014