Natural infection of Triatoma vitticeps (Stal, 1859) with flagellates morphologically similar to Trypanosoma cruzi (Chagas, 1909) in Espirito Santo State

Adult specimens of Triatoma vitticeps are frequently captured by residents in rural areas of the State of Espirito Santo, Brazil. With aim of determining the natural infection rate of this species, we examined the excrement of 116 wild specimens, captured in 27 municipal districts of the state, after blood meal in chicken and spontaneous excretion. Of these, 100 (86,2%) were infected with flagellates morphologicafly similar to Trypanosoma cruzi. Our results showed natural infection rates of Tritoma vitticeps superior to previous studies. The low incidence of Chagas disease in the state is probably due to late excretion in this vector, given that works of alimentary specificity demonstrated the presence of Tritoma vitticeps in intradomiciliary and frequent contact with humans. The high rate of natural infection observed reinforces the need for sustained entomologic surveillance on this triatomine.