Inquérito preliminar sôbre a infecção pelo Trypanosoma cruzi (Chagas, 1909) entre cães e gatos domésticos no município de Campo Florido (Triângulo Mineiro), Minas Gerais, Brasil

Reservoir host competence and the role of domestic and commensal hosts in the transmission of Trypanosoma cruzi

“…The probability of bug infection after feeding on an infected host is crucially related to bloodmeal size, which varies among bug stages, duration of exposure to the host and other factors (reviewed in Gürtler et al, 1996a). For example, the pioneering xenodiagnostic surveys of dogs conducted in Brazil (Freitas, 1950;Freitas et al, 1952;Martins et al, 1945) and recent ones using hemoculture (5-8 mL of host blood) and/or PCR (Bezerra et al, 2014;Eloy and Lucheis, 2012;Lucheis et al, 2005) documented the frequent occurrence of parasitologically-positive dogs or cats (Table 1). In contrast, dogs seropositive for T. cruzi across several areas were hemoculture-negative when smaller amounts (0.2-0.4 mL) of blood were tested (Roque et al, 2008;Xavier et al, 2012;Rocha et al, 2013).…”

“…6.1 (2/33) ND (Román, 1947) Bolivia, Potosí, Vichacla ND 12.8 (2/17) ND (Román, 1947) Bolivia, Santa Cruz, Porongo (Brenière et al, 1998) Brazil, Minas Gerais, Jaboticatubas T. infestans, T. vitticeps or P. megistus (5 nymphs) 22.7 (5/22) ND (Martins et al, 1945) Brazil, Sao Paulo, Cassia dos Coqueiros ND 28.6 (161/563) ND (Freitas, 1950) Brazil, Goiás, Montevidiu ND 5.9 (1/17) ND (Freitas and Mendonça, 1951) Brazil, Campo Florido T. infestans (5 nymphs) 7.8 (8/102) NR (Freitas et al, 1952) Brazil, São Paulo, Ribeirao Preto T. infestans 0 (0/18) ND (Siqueira et al, 1957) Brazil, Minas Gerais, Campo Florido ND 3.0 (1/33) ND (Rocha and Siqueira, 1958) Brazil 19.4 (25/129) ND (Tonn et al, 1978) ND, no data; NR, not reported;* Only seropositive animals were examined. £ Only animals aged ≥1 year were reported.…”