Abstract
Bee virus Y (BVY), isolated from dead adult honey bees (Apis mellifera) collected in the field, is a commonly occurring serotype of bee virus X (BVX) in Great Britain. The viruses are very similar physically, although BVY aggregates in low salt concentrations and its single protein has a slightly lower mol. wt. than that of BVX. The viruses form separate bands when centrifuged to equilibrium in CsCl.