This is a hypothetical question. I did not find AFB in my hives, but in a neighbour’s. I had advice to prevent AFB in my hives by feeding antibiotics. Feeding antibiotics to bees is illegal in NSW, Australia, unless you get a prescription from the vet for EFB. EFB can be completely cured, whereas AFB can’t be cured, because the spores will survive.
Another way to prevent an AFB outbreak if you suspect your spore count to be high due to AFB close by, is to cycle old broodframes into the honey super and after extraction either irradiate or destroy the old comb.
Now, this isn’t possible if you have flow frame honey supers. Also, the frame cycling wouldn’t prevent AFB if your healthy bees go and rob honey from a weaker AFB affected colony in the neighbourhood.
I heard to requeen with a queen bred for hygiene might help when the spore count isn’t too high.
Another way of prevention is to plant medicinal plants.
What do flow hivers around the World do for AFB prevention or treatment?
Is there anybody out there who successfully dealt with AFB without having to feed antibiotics constantly?