“…Two different strains have been identified (Abinanti et al, 1961), one human (Chanock et al, 1958) and one bovine (Reisinger et al, 1959) both causing respiratory tract disease (Wenzel et al, 1972;Frank & Marshall, 1973). PIV3 consists of at least six structural proteins, the large (L), haemagglutinin-neuraminidase (HN), fusion (F), phospho (P), nucleocapsid (N), and matrix (M) proteins (Galinski et al, 1986;Rydbeck et al, 1986;Sanchez & Banerjee, 1985;Shibuta et al, 1979).…”