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Am J Trop Med Hyg ; 86(6): 972-9, 2012 Jun.
Article in English | MEDLINE | ID: mdl-22665603

ABSTRACT

To examine the existence of a possible threshold for the domestic infestation rate of Triatoma dimidiata, below which transmission becomes unlikely, a census was conducted in 59 Chagas disease endemic communities of El Salvador and Honduras. Entomological and serological tests were conducted targeting 4,083 households and 6,324 children between 6 months and 15 years of age. The overall domestic infestation rate of Triatoma dimidiata and seroprevalence among children were 12.9% and 0.49%, respectively. Communities with a domestic infestation rate at 8% or less consistently showed a seroprevalence of 0%. In communities with a domestic infestation rate above 8%, there was a wide range in seroprevalence. A domestic infestation rate of 8% could serve as the possible threshold below which transmission would become unlikely. The implementation of an 8% threshold for determining needs for universal insecticide spraying would lead to a 21% reduction in spraying-related costs.


Subject(s)
Chagas Disease/epidemiology , Chagas Disease/transmission , Ectoparasitic Infestations/epidemiology , Ectoparasitic Infestations/prevention & control , Triatoma , Adolescent , Animals , Child , Child, Preschool , El Salvador/epidemiology , Honduras/epidemiology , Humans , Infant , Insect Control/methods , Insect Vectors , Insecticides , Seroepidemiologic Studies , Triatoma/parasitology , Trypanosoma cruzi/isolation & purification , Trypanosoma cruzi/pathogenicity
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