Empty comb

The differences in empty comb and their role in spreading AFB

Empty, drawn comb is less likely to carry large numbers of AFB spores than is comb containing brood, or wet comb from honey supers.

The only exception is frames from the brood chamber of an AFB infected colony that has died, either from the disease or other reasons. These frames can contain AFB scale (the dried remains of diseased larvae or pupae), and are therefore very likely to transfer the disease to a new colony.