Alterações do peridomicílio e suas implicações para o controle do Triatoma brasiliensis Peridomiciliary changes and implications for Triatoma brasiliensis control

Abstract

Em Boa Viagem, Ceará, foram investigados e rociados 9.906 anexos dos peridomicílios de 1.541 vivendas rurais em área infestada por Triatoma brasiliensis e/ou Triatoma pseudomaculata com revisões aos 6, 12 e 18 meses. Observou-se um decréscimo do número de anexos nos 18 meses, mais intenso para anexos tipo "pilhas de materiais". De modo geral, a população só modificou 3% dos anexos, principalmente os abrigos de animais (6%). A construção de anexos novos foi importante como causa de novas infestações, significativamente mais presentes nestes (25%) que naqueles que existiam desde o início da observação (4%), provavelmente por conta do expurgo inicialmente realizado. A reinfestação ocorreu lentamente, sendo mais freqüente nos abrigos de animais (7,0%) que em pilhas (4,4%) e em cercas e cobertas (A total of 9,906 annexes from 1,541 rural dwellings of Boa Viagem County, Ceará, Brazil, infested by Triatoma brasiliensis and Triatoma pseudomaculata were investigated and immediately sprayed with pyrethroid insecticide, followed by revisions at 6, 12, and 18 months. The initial infestation rate of annexes was 4.0%, with predominant infestation in animal shelters (7.0%). Mean insect density was low, regardless of triatomine species or type of annex. A progressive decrease in the number of initial annexes was observed (66% of remaining annexes), mainly those classified as "piles of materials". Only 3% of the annexes were modified by the population. New constructed annexes were important as new foci of infestation. Some 25% were infested at the end of observation period, significantly more than the "old" annexes (4.0%), a difference attributed to insecticide spraying at the beginning of the intervention. Reinfestation occurred slowly and was more frequent in animal shelters No differences were observed between traditional pyrethroid and slow-release organophosphate formulations. Selective spraying of "new" annexes is recommended.

Keywords

• Doença de Chagas
• Triatominae
• Triatoma brasiliensis
• Controle de Vetores
• Prevenção e Controle
• Chagas Disease
• Triatominae
• Triatoma brasiliensis
• Vector Control
• Prevention and Control