THE BAD: Since varroa are know vectors, host, for many virus, my course of action would be to treat for varroa in the radar hive(s). We do not know how to treat for virus within the hive but we do know how to treat the vector varroa carrying, spreading the virus.
THE GOOD: On a positive note, that is something good to say, honey bees do have an immune system capable of dealing with most, but not all, virus. From what I have read on this forum topic, this thread, the spread of this particular virus appears to be limited to a few honeybees indicating to me, limited transmission OR good virus suppression by the immune system of the honeybees in question. But, keep a watchful eye on the hive or put on your radar as I like to say.
THE UGLY: When I studied virology, I decided I did not like virus, nor studies thereof and my dislike persists to this day. Virus are just weird: not living creatures although the word creature is used as an oxymoron in this sentence.
Best to your bees.