Chandre Fabrice auteur aut IRD Darriet Frédéric auteur aut IRD Doannio J.M.C. auteur aut IRD Rivière François auteur aut IRD Pasteur N. auteur aut IRD Guillet Pierre auteur aut IRD text journalArticle eng text/pdf reformatted digital access The distribution of organophosphate and carbamate resistance was investigated in 33 samples of Culex pipiens quinquefasciatus Say from 25 cities in Côte d'Ivoire and Burkina Faso. Organophosphate resistance levels were higher in Côte d'Ivoire than in Burkina Faso. Chlorpyrifos resistance ratios at LC95 ranged from 4 to 30 times in Côte d'Ivoire and from 3 to 6 times in Burkina Faso. For temephos, ratios ranged from 3 to 18 and from 1 to 2, respectively. Of 27 samples from Côte d'Ivoire, 25 also displayed cross resistance to carbamates as shown by a mortality plateau in bioassays with propoxur and carbosulfan (similar to chlorpyrifos). Cross resistance to organophosphates and carbamates was caused by an insensitive acetylcholinesterase allele (Ace R). This gene was absent from Burkina Faso, except in Niangoloko near the Côte d'Ivoire border. Organophosphate resistance also was associated with the presence of A2-B2 overproduced esterases which had higher frequencies in Côte d'Ivoire (75 - 100%) than in Burkina Faso (40 - 50%). The other esterase with the same electrophoretic mobility as C2 from Puerto Rico and B1 from California were identified for the 1st time in West Africa. "C2" was widespread, whereas "B1" was present in only a few mosquitoes from Côte d'Ivoire. These differences in resistance patterns should be taken into consideration in planning urban mosquito control strategies within 2 countries. (Résumé d'auteur) specialized INSECTICIDE CHIMIQUE RESISTANCE ETUDE COMPARATIVE PHENOTYPE ORGANOPHOSPHATE CARBAMATE RESISTANCE CROISEE AFRIQUE DE L'OUEST COTE D'IVOIRE BURKINA FASO 052LUTIN03 052CULARB 34 6 664-671 1997 0022-2585 https://www.documentation.ird.fr/hor/fdi:010012729 0022-2585 [F B010012729] https://www.documentation.ird.fr/hor/fdi:010012729 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_47-48/010012729.pdf IRD - Base Horizon / Pleins textes 1998-02-13 2017-08-07 fdi:010012729 fre