Infecção natural de triatomíneos do espírito santo por flagelados morfologicamente semelhantes ao Trypanosoma cruzi

An Investigation on the Ecology of Triatoma vitticeps (Stal, 1859) and its Possible Role in the Transmission of Trypanosoma cruzi, in the Locality of Triunfo, Santa Maria Madalena Municipal District, State of Rio de Janeiro, Brazil

“…The infection rate (59.31%) of adult triatomines from Triunfo by T. cruzi confirms the results obtained by Silveira et al (1983) and Sessa and Carias (1986) in Espírito Santo. However, in the present study it was registered for the first time one 5th instar nymph infected with T. cruzi in the bedroom, possibly acquired outside the domicile.…”

“…In this study the number of females trapped (63%) was higher than the males (34%), both in areas A and B, in aggreement with the findings of Sessa and Carias (1986) and Schofield et al (1991) in this case related to T. infestans, showing that females migrate more than males. This can be due to a higher necessity of blood meal by females (Dias et al 1989, Gonçalves et al 1991.…”

“…vitticeps may be considered a sylvatic species by the low prevalence of human infection (Santos et al 1969a,c, Pinto et al 1969, 1986, Barros et al 1975, Peçanha et al 1983, Silveira et al 1983, Dias et al 1989) and the high rates of infection by T. cruzi observed only in adults bugs (Santos et al 1969b, Silveira et al 1983, Ferreira et al 1986, Sessa & Carias 1986, Dias et al 1989 evidencing that the parasite has been acquired outside the houses. However, it is begining to colonize in some localities (Sessa & Carias 1986, Dias et al 1989, Santos et al 1969b, Silveira et al 1983, suggesting a wide ecological valence which was previously low (Forattini et al 1979). The results of the present work show a great difference in the number of insects trappeded in areas A and B of the locality of Triunfo, which seems to be related with the preservation of the second area, since both were isolated from each other and from area C.…”

“…Lent and Jurberg (1978) confirmed its colonization in Espírito Santo, Minas Gerais and Rio de Janeiro. In Espírito Santo, Silveira et al (1983) and Sessa and Carias (1986) registered the colonization in seven and in one municipal districts, respectively. Dias et al (1989) emphasized the high dispersion in this state, reporting signs of colonization in some districts.…”

Dynamics of feeding and defecation in Triatoma vitticeps (Stal, 1859) (Hemiptera, Reduviidae, Triatominae) and its potential in the transmission of Trypanosoma cruzi

“…It is essentially a forest species, whose adults invade houses attracted by light or in search of blood meals, although they are apparently unable to colonize human habitations (Santos et al 2005). In Espírito Santo, insects captured indoors present high rates of infection by flagellates morphologically similar to Trypanosoma cruzi (Chagas, 1911) (Sessa & Carias 1986, Dias et al 1989, Santos et al 2006.Among the characteristics that define the capacity of a triatomine to infect a host with T. cruzi are feeding and defecation behavior. Species that defecate during or shortly after taking a bloodmeal, so that infected faeces are deposited on the host, show the greatest vector potential (Dias 1956, Diotaiuti et al 1995.…”