Deltamethrin resistance in Aedes aegypti results in treatment failure in Merida, Mexico
2017
GONZALO VAZQUEZ PROKOPEC | ANUAR MEDINA BARREIRO | AZAEL CHE MENDOZA | FELIPE ANTONIO DZUL MANZANILLA | FABIAN CORREA MORALES | JOSE VALENTIN UC PUC | SCOTT RITCHIE | PABLO CAMILO MANRIQUE SAIDE | GUILLERMO GUILLERMO MAY | WILBERT BIBIANO MARIN | EDUARDO GEDED MORENO | JOSE VADILLO SANCHEZ | JORGE PALACIO VARGAS | AUDREY LENHART
The operational impact of deltamethrin resistance on the efficacy of indoor insecticide applications to control Aedes aegypti was evaluated in Merida, Mexico. A randomized controlled trial quantified the efficacy of indoor residual spraying (IRS) against adult Ae. aegypti in houses treated with either deltamethrin (to which local Ae. aegypti expressed a high degree of resistance) or bendiocarb (to which local Ae. aegypti were fully susceptible) as compared to untreated control houses. All adult Ae. aegypti infestation indices during 3 months postspraying were significantly lower in houses treated with bendiocarb compared to untreated houses (odds ratio < 0.65) whereas no statistically significant difference was detected between the untreated and the deltamethrin-treated houses. On average, bendiocarb spraying reduced Ae. aegypti abundance by 60% during a 3-month period. Results demonstrate that vector control efficacy can be significantly compromised when the insecticide resistance status of Ae. aegypti populations is not taken into consideration.
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