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Chagas Disease Vector Control in Tupiza, Southern Bolivia

By G Guillen, R Diaz, A Jemio, J Alfred Cassab, C Teixeira Pinto and CJ Schofield

Abstract

Heavy domestic and peridomestic infestations of Triatoma infestans were controlled in two villages in southern Bolivia by the application of deltamethrin SC25 (2.5% suspension concentrate) at a target dose of 25 mg a.i./m². Actual applied dose was monitored by HPLC analysis of filter papers placed at various heights on the house walls, and was shown to range from 0 to 59.6 about a mean of 28.5 mg a.i./m². Wall bioassays showed high mortality of T. infestans during the first month after the application of deltamethrin. Mortality declined to zero as summer temperatures increased, but reappeared with the onset of the following winter. In contrast, knockdown was apparent throughout the trial, showing no discernible temperature dependence. House infestation rates, measured by manual sampling and use of paper sheets to collect bug faeces, declined from 79% at the beginning of the trial to zero at the 6 month evaluation. All but one of the houses were still free of T. infestans at the final evaluation 12 months after spraying, although a small number of bugs were found at this time in 5 of 355 peridomestic dependencies. Comparative cost studies endorse the recommendation of large-scale application of deltamethrin, or pyrethroid of similar cost-effectiveness, as a means to eliminate domestic T. infestans populations in order to interrupt transmission of Chagas diseas

Topics: Triatoma infestans, Chagas disease, vector control, pyrethroids, Bolivia, Microbiology, QR1-502, Science, Q, DOAJ:Microbiology, DOAJ:Biology, DOAJ:Biology and Life Sciences, Arctic medicine. Tropical medicine, RC955-962, Special situations and conditions, RC952-1245, Internal medicine, RC31-1245, Medicine, R, DOAJ:Internal medicine, DOAJ:Medicine (General), DOAJ:Health Sciences
Publisher: Instituto Oswaldo Cruz, Ministério da Saúde
Year: 1997
DOI identifier: 10.1590/S0074-02761997000100001
OAI identifier: oai:doaj.org/article:1ca3a3f4a4374bccab1978dc31a15e93
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