C-Type Virus Particles in Placentas and Fetal Tissues of Rhesus Monkeys23

Abstract

C-type virus particles were detected by electron microscopy on undifferentiated mesenchymal cells and syncytial trophoblasts of chorionic villi in each of 4 normal rhesus monkey placentas examined. Viral buds were also seen on erythroblasts and erythrocytes within fetal spleen and kidney tissues as well as on smooth muscle cells within the umbilical cord of associated embryos.