Are EFB combs infectious? What should be done with EFB die outs? I have a stack sitting on top of an EFB hive that recovered strongly with Terramycin treatment. Only about 25% of treated hives recovered, the rest died over winter with plenty of stores. Does extracting EFB brood chambers spread
EFB through to other equipment during the extracting process? Is EFB spread through extracting supers?