| regional distribution of paenibacillus larvae subspecies larvae, the causative organism of american foulbrood, in honey bee colonies of the western united states. | we examined honey bee, apis mellifera l., colonies pollinating almonds in california during february 2003 for paenibacillus larvae subsp. larvae, the causative organism of the virulent brood disease american foulbrood. colonies originating from the rocky mountain area and california had significantly higher numbers (p < 0.05) of bacterial colony-forming units (cfus) (408 and 324 per 30 adult bees, respectively) than colonies from the upper midwest (1.28). colonies from the northwestern, central, ... | 2005 | 16156557 |