Aspectos do ciclo silvestre do Trypanosoma cruzi em regiões de cerrado (Município de Formosa, Estado de Goiás)

Abstract

Neste trabalho estão apresentados resultados de estudos sobre roedores, marsupiais e triatomíneos do norte do municipio de Formosa,Estado de Goiás, e sua importância no ciclo silvestre do T.cruzi. A região estudada esta localizada do ponto de vista geográfico, na "Provincia do Cerrado". Foram coletados 963 roedores, 11 marsupiais e 766 triatomíneos silvestres. O índice de infecção pelo T. cruzi entre os roedores foi de 0,1% e entre os marsupiais 36,3%, enquanto todos os triatomíneos estavam negativos. Face aos aspectos ecológicos estudados, discute-se o papel desempenhado por roedores e marsupiais na manutenção e circulação do T. cruzi em ambiente silvestre. Alguns aspectos epidemiológicos no ambiente doméstico foram também abordados.

Enzootic transmission of Trypanosoma cruzi and T. rangeli in the Federal District of Brazil

“…Over 50 species of rodents have been found infected by T. cruzi in the Americas (22 in Brazil), but they seem to play a minor role in the maintenance of wild cycles in central Brazil. Infection rates of 0.1% (1/963) and 0.3% (2/722) have been reported from Goiás 26 and São Paulo 16 , respectively. Only one rodent (Akodon cursor) was infected in our sample (n = 70), resulting in rates of 1.4% for all rodents and 14.3% for A. cursor (1/7).…”

Infestation of thornbird nests (Passeriformes: Furnariidae) by Psammolestes tertius (Hemiptera: Reduviidae) across Brazilian Cerrado and Caatinga ecoregions

“…ZOOLOGIA 28 (3): 411-414, June, 2011 data for 318 P. rufifrons rufifrons nests from 20 Cerrado localities (states of Minas Gerais, São Paulo and Goiás) (BARRETTO & CARVALHEIRO 1968, MELLO 1981, 1982, SILVA & LUSTOSA 1993 and 170 P. rufifrons specularis nests from 27 Caatinga localities (state of Pernambuco) (LUCENA & LUCENA 1965).…”

Triatoma costalimai, a neglected vector of Trypanosoma cruzi in the Cerrado savannas of South America: A comprehensive review

“…This use of material drawn from the environment as a means of camouflage, which is seen in nymphs of a few further Triatomini ( Zeledón et al., 1973 ; Weirauch, 2006 ; Ramírez et al., 2013 ; Monte et al., 2014 ), suggests that T. costalimai is adapted to, and hence likely evolved in, rocky-substrate microhabitats. Mello (1982) also reported the association of wild T. costalimai with limestone outcrops in northeastern Goiás; it is important to emphasize that Mello (1981 , 1982) also studied more than 325 non-rocky ecotopes in the same fieldwork areas but found T. costalimai in none of them – including 100 trees (some with T. sordida and/or T. pseudomaculata ), 96 palms (some with Rhodnius neglectus and T. sordida ), 102 bird nests (some with Psammolestes tertius ) or 29 armadillo burrows (no bugs found). Similarly, Gurgel-Gonçalves et al.…”

“…(2012c) did not find T. costalimai in the 118 palms they investigated within the species’ range in Goiás, Tocantins, Bahia, and Minas Gerais – and 50 of which were infested with R. neglectus . On the other hand, we are aware of no field survey reporting the occurrence of other triatomine-bug species, save T. jatai , in the rocky-outcrop ecotopes used by T. costalimai ( Schofield et al., 1980 ; Mello, 1981 , 1982 ; Teves, 2012 , 2018 ; Machiner, 2012 ; Machiner et al., 2012 ; Gonçalves et al., 2013 ; Vendrami, 2017 ; Teves et al., 2019 ). Triatoma williami , which seems to be rupicolous too ( Abad-Franch & Gurgel-Gonçalves, 2021 ), has however been recorded in areas of Goiás where T. costalimai also occurs ( de Oliveira, 2006 ; de Oliveira & Silva, 2007 ), raising the possibility of interspecies competition for rocky-outcrop habitats.…”

“…Surveillance data show, for example, that none of the more than 60,000 triatomine bugs caught in or around houses in Goiás and Tocantins during 1976–1980 ( Lustosa et al., 1984 ) or in Tocantins during 1984–1988 ( Silva et al., 1991 ) was identified as T. costalimai . Local-scale surveys also suggested that the species was seldom found in human environments ( Mello, 1981 , 1982 ; García-Zapata et al., 1985 ; García-Zapata & Marsden, 1992 ; Elias et al., 1994 ; Marsden et al., 1994 ; Silveira et al., 2001 ). In the late 1990s, Lorosa et al.…”