And just for those who may not be familiar, let me explain why. Antibiotics kill microbes wholesale within a hive. There are literally hundreds of species present and they compete with each other. Specifically, the one that causes chalkbrood competes with the one that causes AFB. Now they've all been severely wounded and the chances of AFB surfacing are now much greater than they would have been if you had left them alone.
You've stepped on the treadmill and selected the program. Better get off now or you're going to have to start walking.