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2008Seroprevalence and isolation of Toxoplasma gondii from sheep from São Paulo state, Brazil Journal of Parasitology, Lancaster, v. 94, n. 6, p. 1259-1263 ABSTRACT: Sheep are important in the epidemiology of Toxoplasma gondii infection, but little is known of ovine toxoplasmosis in Brazil. Antibodies to T. gondii were assayed in sera of 495 sheep from 36 counties of São Paulo state, Brazil, using the modified agglutination test (MAT titer Ն1:25); 120 (24.2%) sheep tested positive. Samples of brain, heart, and diaphragm of 82 seropositive sheep were pooled, digested in pepsin, and bioassayed in mice. Toxoplasma gondii was isolated from tissue homogenates of 16 sheep, and the isolates were designated TgShBr 1-16. Six of the 16 T. gondii isolates killed 100% of infected mice. Results indicate that asymptomatic sheep can harbor mouse-virulent T. gondii; hence, they can serve as a source of infection for humans.
Goats are economically important in many countries, and little is known of caprine toxoplasmosis in Brazil. Antibodies to Toxoplasma gondii were assayed in the sera of 143 goats from 3 Brazilian states, using modified agglutination test (MAT titer > or = 1:25); 46 (32.2%) tested positive. Samples of brain, heart, diaphragm, and masseter of seropositive animals were pooled, digested in pepsin, and bioassayed in mice. Viable T. gondii specimens were isolated from tissue homogenates of 12 goats; the isolates were designated TgGtBr1-12. Ten of the 12 isolates killed 100% of infected mice, indicating that goats can harbor mouse-virulent T. gondii and, hence, can serve as a source of infection for humans.
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