“…Despite negative results with canine parvovirus [1123, infectious bursal disease virus [8] and bovine rotavirus [373, there are several reports about expression products that did induce in vitro neutralizing sera. Examples are the gp 120 sequence from HIV [90], the VP7 sequence from simian rotavirus [6], the VP7c sequence from bovine rotavirus [713, the major antigenic site on VP 1 from foot-and-mouth-disease virus [14,15,138], the VP 1 regions 52-302 and 24-129 from poliovirus I [493, the VP2 sequence from infectious pancreatic necrosis virus [643, and the N-terminal gD sequence from herpex simplex virus I [56, 583. More spectacular is the induction of protective immunity.…”