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We, at Shanvaus Apiary, never experienced any case of American Foulbrood since we started in 1990.
The main reason is the particular treatment we apply on swarms, not only on such of unknown origin, but even when swarming has happened while we were working at a hive right beside the affected colony.
The first rule is to catch the swarm in a way causing only minimal stress to the bees. If the queen is spotted on the cluster she is caged and attached to the inner side of the front wall of the swarm box. When the box is positioned safely and provided with an opaque lid the bees almost always move into the container voluntarily and can be collected when flying has stopped in the evening.
Swarms, hanging from a mix of branches and twigs are sprayed with water - ideally mixed with a little thyme solution - and each twig clipped separately and gently laid on the bottom of the swarm box. If you find the queen, proceed as mentioned before, if not, remove all of the small clusters from the tree or bush, put them into the box, if necessary with the twig, leave a small gap at the swarm box for bees to enter and again wait until evening.
Swarms located at the upper branches of a tree can be removed by cutting the branch partially off and gently lowering it until the cluster can be received by a second person holding the swarm box. Again you should try to spot the queen.
If you already keep bees, you know that there are innumerable ways in which a swarm can settle down, in crevices of buildings, chimneys, move into empty hives and so on. Anyway, after the bees have all moved into the swarm box provided, the entrance is closed (the box is either fitted with a mesh floor or needs a mesh lid for ventilation) and transferred to a cool, dark place and left there for three days.
In the evening of the third day the bees are taken to their new location where a hive complete with fresh foundation is waiting. Up to four central frames are removed. The swarm box is pushed on the ground, the lid removed, and the bees sprayed with water.The bees are slid into the gap between the frames, the cage with the queen (if caught before) inserted between two frames and the frames, which had been removed, gently entered again. The frames will slowly move into position.
When bees are no longer present on the edges of the hive the Adam-feeder is placed on top and filled with sugar syrup. Feeding is repeated whenever the feeder is empty until a sufficient amount of comb for laying and storage is available.
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