Micro-encapsulated pirimiphos-methyl shows high insecticidal efficacy and long residual activity against pyrethroid-resistant malaria vectors in central Cote d'Ivoire

被引:23
|
作者
Tchicaya, Emile S. [1 ,2 ]
Nsanzabana, Christian [3 ,4 ]
Smith, Thomas A. [5 ,6 ]
Donze, Jennifer [7 ]
de Hipsl, Maiti Laserna [5 ,6 ]
Tano, Yao [2 ]
Mueller, Pie [5 ,6 ]
Briet, Olivier J. T. [5 ,6 ]
Utzinger, Juerg [5 ,6 ]
Koudou, Benjamin G. [1 ,2 ,8 ]
机构
[1] Ctr Suisse Rech Sci Cote dIvoire, Dept Environm & Sante, Abidjan 01, Cote Ivoire
[2] Univ Felix Houphouet Boigny, Unite Format & Rech Biosci, Abidjan, Cote Ivoire
[3] Univ Oxford, Nuffield Dept Clin Med, Ctr Trop Med, Oxford OX3 7LE, England
[4] World Wide Antimalarial Resistance Network, Oxford OX3 7LE, England
[5] Swiss Trop & Publ Hlth Inst, Dept Epidemiol & Publ Hlth, CH-4002 Basel, Switzerland
[6] Univ Basel, CH-4003 Basel, Switzerland
[7] Univ Neuchatel, Dept Parasitol, CH-2000 Neuchatel, Switzerland
[8] Univ Liverpool, Liverpool Sch Trop Med, Dept Parasitol, Ctr Neglected Trop Dis, Liverpool L3 5QA, Merseyside, England
关键词
Malaria; Insecticide resistance; Indoor residual spraying; Organophosphates; Anopheles gombloo Hut trial; Cote d'Ivoire; ANOPHELES-GAMBIAE; ORGANOPHOSPHORUS COMPOUNDS; POLITICAL CRISIS; CARBAMATE;
D O I
10.1186/1475-2875-13-332
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
Background: The wide scale implementation of insecticide treated nets and indoor residual spraying (IRS) has contributed to a considerable decrease of malaria morbidity and mortality in sub-Saharan Africa over the last decade. Due to increasing resistance in Anopheles gambioe sensu lato mosquitoes to dichlorodiphenyl trichloroethane (DDT) and pyrethroids, alternative insecticide formulations for IRS with long-lasting residual activity are required to sustain the gains obtained in most malaria endemic countries. Methods: Three experimental capsule suspension (CS) formulations of the organophosphate pirimiphos-methyl were evaluated together with Actellic 50 EC, an emulsifiable concentrate (EC) of pirimiphos methyl, and the pyrethroici ICON 10 CS, a lambda-cyhalothrin CS formulation, in an experimental hut trial. The formulations were tested on two types of surfaces: mud and cement. The study with a 12 month follow-up was carried out in Bouake, central Cote d'Ivoire, vvhere An gambiae mosquitoes show high levels of resistance against pyrethroids, DDT and carbamates. Residual activity was also tested in cone bioassays with the susceptible An. gambiae KISUMU strain. Results: One of the CS formulations of pirimiphos-methyl, CS BM, outperformed all other formulations tested. On cement surfaces, the odds ratios of overall insecticidal effect on An. gambiae s.l. of pirimiphos-methyl CS BM compared to Actellic 50 EC were 1.4 (95% confidence interval (CD: 1.2-1.7) for the first three months, 5.6 (95% Cl: 4.4-7.2) for the second three months, and 3.6 (95% Cl: 30-4.4) for the last six months of follow-up. On mud surfaces, the respective odds ratios were 2.5 (959/6 Cl: 1.9-3.3), 3.5 (95% Cl : 2.7-4.5), and 1.7 (95% Cl : 1.4 2)). On cement the residual activity of pirimiphos-methyl CS BM measured using cone tests was similar to that of lambda-cyhalothrin and for both treatments, mortality of susceptible Kisumu laboratory strain was not significantly below the World Health Organization pre-set threshold of 80% for 30 weeks after spraying. Residual activity was shorter on mud surfaces, mortality falling below 80% on both pirimiphos-methyl CS BM and lambda-cyhalothrin treated surfaces at 25 weeks post -treatment. Conclusion: CS formulations of pirimiphos-methyl are promising alternatives for IRS, as they demonstrate prolonged insecticidal effect and residual activity against malaria mosquitoes.
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页数:13
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