[AR Beekeeper]

CBPV predates the varroa mite, so the varroa is not necessary for the bees to get the virus. Having a heavy mite load stresses the bees so they may display symptoms of the virus when they would not have with few mites.

Here a colony with CBPV is weakened but usually doesn't die. The colony may show symptoms for 2 or 3 years, but then they go away. If the colony becomes very weak and you have extra strong colonies that you wish to reduce in strength, shake a few frames of young bees at the entrance of the colony. The nurse age bees will enter the colony and strengthen it's work force.

Comb reuse I can't comment on because I can't say for sure that using frames between colonies has caused the virus to spread. It does seem that re-queening makes the problem go away.

 

[AR Beekeeper]

That solution should be strong enough. It might work just as well if you spray the comb with a spray bottle and allow it to dry. Remember to use cold water to mix the bleach solution. Hot water reduces the effectiveness of the solution.