Triatoma sordida Stal, 1859 is a predominantly peridomiciliary species that is now the most common triatomine in Brazil (L Diotaiuti et al. 1995 Bol Of Sanit Panam 118: 211-219). Its original habitat was probably the Brazilian "cerrado" (OP Forattini 1980 Rev Saúde Públ 14: 265-99) where it occurs mainly under dead or dry bark of trees (MP Barretto 1979, Epidemiologia, p. 425-449. In Z Brener & Z Andrade, Trypanosoma cruzi e Doença de Chagas, Guanabara Koogan, Rio de Janeiro, L Diotaiuti et al. 1993 Rev Inst Med Trop São Paulo 35: 237-245). Due to growing the destruction of its original habitat in the last years, as a consequence of new colonization projects and expansion of cultivated areas, resulting in uncontrolled environment interventions, the population densities of this species have risen considerably in environments modified by human activity (OP Forattini et al. 1974 Rev Saúde Públ 8: 265-282), including peridomiciliary ecotopes (Diotaiuti et al. 1995 loc. cit.). Knowledge of the ecology of T. sordida in the peridomicile is an important prerequisite for its control. In order to determine the factors involved in peridomiciliary infestation by this species, a survey of triatomine following spraying with deltamethrin was carried out at domiciliary units (DUs) of Agrovila 12 farm in Serra do Ramalho county, Bahia, Brazil, according to methods already described (L Diotaiuti et al. 1998 Rev Panam Salud Púb 3: 21-25). This area had not been treated with insecticides for four years prior to the study. From the 378 DUs studied, 196 were positive (51.9%), with intradomiciliary infestation corresponding to 6% and the peridomiciliary to 99%. A total of 1,937 insects were captured and the infestation index was reevaluated at 4, 8 and 12 months after spraying (Figure). During the pre-intervention survey 48.3% of the peridomiciliary ecotopes studied were found to be infested, particularly those with wood as the main construction material (constituting 92.1% of the ecotopes in the survey), where 95.2% of the insects were captured, followed by those using adobe (6.2%), where 3.8% of the insects were captured and finally those composed of several building materials (1.8%), where 1.1% of the insects were captured. These ecotopes comprised chicken houses (46.7%), pigsties (9.3%), fences (33.9%), bathrooms (0.9%) and miscellaneous others (9.3%); the proportions of insects collected in each ecotope was 69.3, 5.4, 19.4, 0.7 and 5.2% respectively (Table I). A total of 2,934 domestic animals were present in the peridomicile at the time of the survey, of which 78.7% were chickens, 12.5% pigs, 5.2% dogs, 3.1% cats and 0.5% ungulates (goats or oxen). These animals were present in 82.4, 46.6, 51.5, 28.9 and 1.5% respectively of the DUs studied. The blood-meal sources identified by the precipitin test were: birds 56.4%, horses 7.2%, rodents 6.7%, human 2.2%, dogs 1.7%, opossum 0.9%, cats 0.1% and ungulates (goats or oxen) 0.1%. It was not possible to identify the source of 29.2% of insect blood-meals due to insufficient quant...
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