“…In vivo, BIV DNA was detected in a large variety of bovine tissues, including brain, lungs, lymph nodes, spleen, peripheral blood mononuclear cells (PBMC) and semen of infected animals (Gonda et al, 1990;Pifat et al, 1992;Baron et al, 1995Baron et al, , 1998Nash et al, 1995a;Zhang et al, 1997b;Gradil et al, 1999). BIV replicated in vitro in a wide variety of cells, such as bovine, ovine, rabbit and canine cells (Bouillant et al, 1989;Gonda et al, 1990;Zhang et al, 1997b), but not human cells (Kashanchi et al, 1991;Whetstone et al, 1992). BIV induced a cytopathic effect characterized by the formation of syncytia in permissive cells.…”