“…Some individual viruses can be distinguished by the inclusions they induce (Edwardson & Christie, 1978;Martelli & Russo, 1977;Maramorosch, 1977). Viruses within nine groups induce distinctive inclusions which are diagnostic for infections at the group level (Table 2) and individual viruses within a group may sometimes produce distinctive effects (Hull et al, 1970;Christie & Edwardson, 1977;Lesemann, 1977, Gill & Chong, 1979Shalla et al, 1980;Hatta & Francki, 1981 a, b).…”