Cadernos de Saúde Pública
On-line version ISSN 1678-4464
DIOTAIUTI, Liléia et al. Operational aspects of Triatoma brasiliensis control. Cad. Saúde Pública [online]. 2000, vol.16, suppl.2, pp. S61-S67. ISSN 1678-4464. http://dx.doi.org/10.1590/S0102-311X2000000800006.
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.
Keywords : Chagas Disease; Triatominae; Vector Control; Insect Vectors; Prevention and Control.