I spoke with Peter Little about CBPV (well I didn't get many words in, bless him
) and he suggested requeening as the best course of action, which certainly worked. The colony in question seemed to recover then relapse a couple of times but once the queen was changed, they picked up and were fine, not seen it since. (6 years)
Now with regards to the comb, purely your choice but I didn't destroy any. Let's say your colony goes down with CBPV and there are five supers of honey on them, would you destroy them all? Throughout the period where I found dead bees on the floor and below the stand, the colony was functioning as 'normal', healthy brood and brood pattern and this continued with the new queen, minus the corpses.
To me, it appears to be an adult bee problem therefore I would (did) keep the comb.
Do a test and keep the comb, give it to only one colony and see if they suffer for it?