I agree not keeping a sick plant but it appears what appeared as a virus was possibly a sport. Sum and Sus came up with so many sports it makes you wonder how many removed plants that were not diseased were removed. Diagnosing a hosta on line with all the different screen is like diagnosing a patient with a cold or a virus virtually. The instruction was you only know for sure is if the plant is tested.
There was panic when we first heard about the virus and a lot of plants were destroyed. We were in the garden with magnifying glass.