A novel bisegmented double-stranded RNA virus has been isolated from water processed from Thirlmere reservoir. The virus is icosahedral, 58 nm in diam., has a buoyant density of 1.32 g/ml in CsCl, has an S value of 400 and a RNA/protein ratio of 0.087. The two linear segments of RNA have approx. mol. wt. of 2.26 × 10 and 2.09 × 10. The virus contains six polypeptides. The virus was isolated in cells and fails to replicate in other insect, amphibian, avian, piscine, mammalian and plant cells tested. The virus is biochemically different from infectious pancreatic necrosis virus (IPNV) and X virus (DXV). The virus is also serologically unrelated to IPNV (strain Sp) and another invertebrate pathogenic virus, virus 1. The virus shares common antigens with DXV but is not completely identical.


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