Entomological aspects of Chagas' disease transmission in the domestic habitat, Argentina

Revista de Saúde Pública. 2004;38(2):216-222


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Journal Title: Revista de Saúde Pública

ISSN: 0034-8910 (Print); 1518-8787 (Online)

Publisher: Universidade de São Paulo

LCC Subject Category: Medicine: Public aspects of medicine

Country of publisher: Brazil

Language of fulltext: Spanish, English, Portuguese

Full-text formats available: PDF, HTML, XML



Catalá SS

Crocco LB

Muñoz A

Morales G

Paulone I

Giraldez E

Candioti C

Ripol C


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Editorial Board

Instructions for authors

Time From Submission to Publication: 13 weeks


Abstract | Full Text

OBJECTIVE: To study the risk of Trypanosoma cruzi domestic transmission using an entomological index and to explore its relationship with household's characteristics and cultural aspects. METHODS: There were studied 158 households in an endemic area in Argentina. Each household was classified according to an entomological risk indicator (number of risky bites/human). A questionnaire was administered to evaluate risk factors among householders. RESULTS: Infested households showed a wide range of risk values (0 to 5 risky bites/human) with skewed distribution, a high frequency of lower values and few very high risk households. Of all collected Triatoma infestans, 44% had had human blood meals whereas 27% had had dogs or chickens blood meals. Having dogs and birds sharing room with humans increased the risk values. Tidy clean households had contributed significantly to lower risk values as a result of low vector density. The infested households showed a 24.3% correlation between time after insecticide application and the number of vectors. But there was no correlation between the time after insecticide application and T. infestans' infectivity. The statistical analysis showed a high correlation between current values of the entomological risk indicator and Trypanosoma cruzi seroprevalence in children. CONCLUSIONS: The risk of T. cruzi domestic transmission assessed using an entomological index show a correlation with children seroprevalence for Chagas' disease and householders' habits.