EFB is easy to clear up, but I wouldn't use terra. or requeening. I had a EFB case last year that was from getting a nuc with two old frames in it. All I did was to get rid of the two old brood frames, and it cleared right up. Spores had built up in the old brood comb, which caused the EFB. If I had treated with terramyacin or requeened, it wouldn't have addressed the root cause of the EFB... the old comb where the spores had originated. It may have recurred in a few years...
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