Ivan Vieira SonodaGrasiele Caldas D'Ávila PessoaMirko Rojas CortezJoão Carlos Pinto DiasÁlvaro J. RomanhaLiléia Diotaiuti2026-03-222026-03-22200910.1590/s0074-02762009000400025https://doi.org/10.1590/s0074-02762009000400025https://andeanlibrary.org/handle/123456789/47383Citaciones: 21Strategies for controlling Chagas disease are based on spraying infested houses with pyrethroid insecticides. However, the intense use of these insecticides has promoted resistance of Triatoma infestans and, in Argentina, Bolivia and Southern Brazil, low levels of resistance have been reported. Due to the persistence of T. infestans in the state of Rio Grande do Sul (RS), we evaluated the occurrence of deltamethrin resistance in four strains from different municipalities in comparison to two susceptible strains from Brazil and one resistant strain from Bolivia. The results indicated the absence of resistance in T. infestansfrom RS.enTriatoma infestansDeltamethrinPyrethroidBiologyVeterinary medicineResistance (ecology)Insecticide resistanceTriatomaToxicologyReduviidaearticle