Steve Taber said he managed to breed a strain of bee which he could introduce a badly infected (with AFB)brood frame to, and they would clean it up fine.
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The bees they brought to this study were all survivor colonies from areas with very high infection rates
The plan was to breed from these resistant colonies
The limits of their resistance was tested
There was a breeding program using isolated mating stations
They managed a slight increase in resistance in the first generation and no further improvement in subsequent breeding.
The project failed to produce bees with sufficient increase in resistance to be meaningful.
The characteristics could not be sufficiently well fixed even in a closed population to be worthwhile