| detection of reassortant orbiviruses (wallal serogroup) in a prototype strain isolated from a pool of biting midges (culicoides dycei). | genetic variation between clones selected from early passage pools of wallal virus (reoviridae, orbivirus) was investigated. the virus had been isolated in 1970 from a pool of 100 insects (culicoides dycei), caught in the wild, by laboratory passage in suckling mice. gel electrophoresis and oligonucleotide fingerprint analysis of clones indicated that multiple reassortant genotypes were present in early passages of the original isolate. the virus, previously described as the prototype strain of ... | 1989 | 2732705 |