CONICET | Buscador de Institutos y Recursos Humanos

Chagas disease is a chronic parasitic infection restricted to America where it is currently estimated that90 million people are at risk of acquiring the infection. Chemical control with pyrethroid insecticides hasbeen effective to reduce disease transmission in several areas of the Southern Cone, although insecti-cide resistance has evolved and diminished the campaigns? results. Considering previous reports on thedifferent levels of resistance between Triatoma infestans from different geographical areas, the objectiveof this work was to determine if T. infestans populations are toxicologically structured within localities.Response to the insecticide was measured and compared between houses of two Argentine localities.Different toxicity of deltamethrin was detected between dwellings of Chaco province, accounting forboth susceptible and resistant houses within the same locality. However no difference was found amonghouses of Salta province. The results obtained in this work suggest that geographical structure is presentnot only at the between localities level, but also at the microgeograhical level.