“…Retroviruses related to the type D viruses of primates have been demonstrated in the house shrew (Tsutsui et al, 1985;Aoyama et al, 1988), sheep He et al, 1992;De las Heras et al, 1993), cattle (York et al, 1989) and goats (De las Heras et al, 1991). Of these type D viruses, only the simian retroviruses and the small ruminant retroviruses have been associated with any disease (Marx & Lowenstine, 1987;Sharp, 1987).…”