The authors studied 135 placentas of chagasic mothers who did not transmit their infection to the conceptus. In only one of these placentas they found rare parasites plus a focal and mild chronic villitis. In another 24 placentas they observed only villitis in the absence of parasitism determining a frequency of 17.9% of villitis of unknown etiology. A control group of placentas of non chagasic mothers was studied. The difference of frequency of villitis of unknown etiology in both groups was not statistically significant
Congenital American trypanosomiasis; Hematogenous placentitis; Villitis of unknown cause; Chagasic placentitis