David, this is something that I've noticed too.  I'm not sure whether it is
simply because I am running more hygienic bees, because there is less feral
population, or what.  But it sure is curious.


May be the widespread adoption of Tylosin. If most commercial beekeepers are using it and have stamped down foulbrood in their outfits, this would tend to reduce the incidence of foulbrood in general, irrespective of whether smaller beekeepers use it or not.

From BEE DISEASES AS FACTORS IN THE LIFE AND BEHAVIOR OF THE HONEYBEE COLONY. Dr. J. E. ECKERT, 1956:

> The beekeeping industry is now employing the use of therapeutics to prevent, to control and to eradicate American foulbrood as well as certain other bee diseases. The response of honeybees to the stimulating effects of these treatments has changed the concept of American foul brood from one of utter destruction to one that envisions its ultimate control without destroying valuable colonies or equipment. 

> It is an example of how an insect can be aided by modern medicine in its fight for survival. The place of the honeybee as an essential agent in the production of fruits, and seeds and vegetables, as well as of honey and beeswax, is more secure than ever before. 

> Since extremely small amounts of therapeutics are needed, and since they can be administered before or after nectar-flows, the danger of contaminating honey with them is slight when they are used properly. The incidence of bee diseases in well managed apiaries is generally low- and only where colonies are endangered by bee diseases, need these aids to bee behavior be used in order to maintain healthy and flourishing colonies.  

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