[Ultrastructural aspects of sheep choroid plexus cells during exogenous cell fusion induced by Visna virus in vitro].

During the first moments of the in vitro infection of Sheep choroid plexus cells with high multiplicities of infection of Visna virus, the authors observed: a strong development of GERL, some signs of an intensive protein synthesis and numerous filament bundles. This infection leads to an exogenous cell fusion.