Polymorphism of the migration of double-stranded RNA genome segments of avian reoviruses

A number of field isolates of avian reoviruses were characterized by analysis of the migration pattern of their genomic double-strand RNA (dsRNA) segments among isolates of the same serotype as well as among different serotypes, (iii) no correlation between genotype and disease state, (iv) less marked variability in migration pattern from isolates within a restricted geographic locale compared to isolates from distant locales, (v) the presence of a single genotype in local outbreaks of disease, and (vi) the relative invariant migration of several dsRNA segments among the avian reoviruses, one of which (S1) may serve to distinguish the avian from the mammalian reoviruses.