Re-Infestation of Houses by Triatoma dimidiata after Intra-domicile Insecticide Application in the Yucatan Peninsula, Mexico

DUMONTEIL, E., H. RUIZ-PIÑA, M. BARRERA-PÉREZ, E. RODRÍGUEZ-FÉLIX, M. JESÚS RAMÍREZ-SIERRA, J. E. RABINOVICH AND FRÉDÉRIC MENU

MEMóRIAS DO INSTITUTO OSWALDO CRUZ.

Año: 2004 vol. 99 p. 253 - 256

0074-0276

In most countries, Chagas disease transmission control remains based on domestic insecticide application. We thus evaluated the efficacy of intra-domicile cyfluthrin spraying for the control of Triatoma dimidiata, the only Chagas disease vector in the Yucatán peninsula, Mexico, and monitored potential re-infestation every 15 days for up to 9 months. We found that there was a rapid re-infestation of houses by adult bugs starting only 4 months after insecticide application, possibly from sylvatic/peri-domicile areas. This suggests a limited efficacy of a single intra-domicile insecticide application, and points out the need to take into account the potential dispersal of sylvatic/peri-domestic adult bugs into the domiciles as well as continuity action for an effective vector control.