[Operational aspects of Triatoma brasiliensis control].
Vector control strategies against indigenous species is not easy, due to their capacity to reinvade treated premises from sylvatic ecotopes. Between August 1996 and December 1997 we conducted a study on reinfestation of houses after spraying in a county in the State of Ceará. Of 277 houses examined, 113 (40.8%) were infested (21.7% intradomiciliary and 35.4% peridomiciliary). Of the 433 Triatominae collected, 207 were Triatoma brasiliensis (49% of which intradomiciliary, with a mean of 1.8 insects/house) and 226 were Triatoma pseudomaculata (97% peridomiciliary). The age structure of the two indicated a univoltine development cycle for T. brasiliensis and two cycles per year for T. pseudomaculata. Four months after spraying with deltamethrin SC 25mg ia/m2, 9.7% of the houses were still positive, mainly with peridomestic infestations. Intradomiciliary wall bioassays showed persistence of the insecticide up to 9 months after spraying. Considering the high potential for recolonization of treated premises from sylvatic foci, we propose an operational strategy combining traditional evaluations and community-based surveillance with increased selective interventions and community education.
Diotaiuti
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Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, 30190-002, Brasil. diotaiut@cpqrr.fiocruz.br
Faria Filho
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Carneiro
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Dias
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Pires
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Schofield
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CJ
D000818:Animals; D001938:Brazil / Q000453:epidemiology; D014355:Chagas Disease / Q000453:epidemiology / Q000469:parasitology / Q000517:prevention & control*; D005260:Female; D006798:Housing; D006801:Humans; D007300:Insect Control; D007303:Insect Vectors; D008297:Male; D014224:Triatoma