Some ultrastructural aspects of the replication of a Yucaipa-like virus in Vero cells.

The replication in Vero cells of a Yucaipa-like virus isolated from a wild bird in West Africa (PLOC/Senegal/9/76) was studied with an electron microscope at days 6 and 8 post-inoculation. Viral nucleocapsids, 15 nm in diameter, were found in the cytoplasm, mainly beneath the cell membrane. Viral particles, 125 to 175 nm in diameter, were released from the cells by a budding process. No viral nucleocapsid could be observed within the nucleus of infected cells.