Last October I inspected hive for a friend who suspected she had EFB. I've never seen EFB or AFB, other than pictures and videos. There was a slight rancid smell coming from some frames and brood looked like pictures of EFB I've seen. I took a frame home and cut out a sample to send to a bee lab. I never received anything back so at the beginning of February I sent another brood comb sample for testing. The results said that only varroa was found, no mention of foulbrood. My question is, could any residue of EFB been killed in the 3 months that the frame was in my chest freezer. Do freezing temps kill efb? Do they kill afb?