Transmisión congénita de Trypanosoma cruzi en crías de ratas Wistar con infección chagásica aguda

congenital trypanosoma cruzi transmission was evaluated in pups of wistar rats with acute chagas infection. the rats were injected intraperitoneally with 1.5 x 104 metacyclic tripomastigotes from the i/pan/ve/00/planalto strain tci lineage. parasitemia was significantly higher (p<0.05) in the pregnant infected rats (pi) than in the infected virgin rats (vi). the offspring of the pi rats at 15, 30, 45 and 60 days after birth (ab) did not show circulating trypanosomes. an elisa test revealed progressive increase of anti-t. cruzi igm in the serum of pups (24%) of the pi rats between 15 and 60 days. anti-t. cruzi igm decreased progressively in the pi pups and became negative at 60 ab. heart and skeletal muscle sections of 15% of the pups of the pi rats at 60 ab showed t. cruzi antigen with pap. t. cruzi dna was detected through prc in the serum of 4 pups (16%) of pi rats at 60 ab. presence of anti-t. cruzi igm and parasite dna in the pups of rats with acute infection can be considered as a criterion of congenital infection in pups without evident parasitemia