Comparative studies of the infection of Lewis rats with four Trypanosoma cruzi clones

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Abstract
Quantitative and qualitative differences in parasitaemia levels and histopathological characteristics occurred in Lewis rats infected with four Trypanosoma cruzi clones. Rats infected with clone Sylvio-X10/7 sustained high parasitaemias and died during the acute phase whereas rats infected with clones Sylvio-X10/4, Miranda/78 or Miranda/80 did not. Myocardial fibrosis was more extensive in rats chronically infected with clone X10/4 than in rats infected with the 2 Miranda clones. Myocardial fibrosis developed more rapidly in rats than has been reported in mice. These characteristics are advantageous in developing animal models of human chagasic myocardiopathy.

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