Two years ago I had my first encounter with FB after noticing the warming signs and doing the "matchstick" test. I quickly sent in samples to the USDA and purchased test kits, multiple, to test and double test my issue.
All test came back as EFB.
I got a VFD from my local vet and ordered Terra-Pro as this is what my research pointed me to. Had I gotten in a year earlier I would have been able to get Terramycin directly.
That same year I harvested as much honey as I could, cut out old comb from infected hives and burned it, scorched all my equipment and of course used the Terra-Pro as directed. This seemed to get rid of the issue...
...until I saw it pop up again, the next year.
I went through the whole song and dance again. It wasn't nearly as bad as the first year - probably because my paranoia caught it early. However, this winter I noticed it again as the bees are starting to build up. I absolutely hate using any antibiotic as it kills all the "good" stuff just as much as the bad and is probably making them more susceptible to getting it, or something else, due to poor cut flora.
I just finished the treatment and have been adding several types of probiotics to the hives, mixed in with dry sugar - made for bees and following directions. So far, no more signs of EFB.
The amount they had this year was very small but I'm hoping if I can get them healthy enough, and overwhelm them with "good bacteria" is may keep it from coming back.
To note, I have never lost a hive over this and it has never gotten out of control. I feel my measures have been extreme but have obviously not worked. Also, not ALL my hives have gotten it. I have one hive in particular which is absolutely booming and has never received a treatment in it's life, EFB, varroa, or otherwise. I only treated when I saw a problem and not as a preventative - maybe that could be part of the issue?
Could this be a case of bad genetics? Anything else I could have done or should do in the future?
I'll be breeding the strongest hive this year in hopes those genetics will carry over to her daughters and I can rid my problem that way, but any input is appreciated.