Abstract
Some properties of a small RNA virus isolated from Mansonia uniformis are described. The virus particles have a sedimentation coefficient of about 165S, buoyant density in CsCl of 1.33 g/ml and diameter of 28 nm. They contain a single-stranded RNA which probably lacks poly (A) but is infective. Four polypeptides with mol. wt. of 33, 30, 27 and about 7 x 103 are present in the virus particle.