It is not a virus, and in fact is not caused by a simple pathogen. And it is Kashmir Bee Virus, I believe. Beekeepers in N. America are much less cognizant of viruses than in England, in part because we have never had a virus specialist. The closest we have now is Akey Hung, at the USDA lab in Beltsville, Maryland. Maybe you could get a direct report from him.
Most beekeepers see mites, and see dying colonies, and it ends there.
Of course we have Parasitic Mite Syndrome, in which the larvae express all sorts of strange symptoms and maybe secondary infections, but we would not have that without Varroa. Dupree, in conjunction with Brenda Ball of Rothamstead, did a study to try to determine whether tracheal mites were tranmitting viruses from one bee to the next. They have no evidence that this in fact occurs. Brenda Ball could provide a more definitive statement on their results. He has never seen bees with both, and usually a geographic region has one or the other.