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Quarantining infected bees reduces foulbrood outbreaks

B. Locke, M. Low, E. Forsgren

Preventive Veterinary Medicine (2019) 167, 48–52

doi: 10.1016/j.prevetmed.2019.03.023

• What did the research find?

Clinical signs of American foulbrood (AFB), caused by Paenibacillus larvae, were not observed after the first year of the management strategy being implemented. During the five years of the study, the proportion of apiaries harbouring P larvae spores decreased from 74 per cent to 4 per cent. The proportion of infected colonies with the highest spore counts disproportionately declined so that, by the end of the study, the only remaining infected apiaries had very low spore counts.

• How was it conducted?

The five-year study was conducted within a commercial beekeeping operation in central Sweden that had previously experienced reoccurring AFB outbreaks. Colonies were regularly monitored for clinical signs of AFB, and any affected colonies were burned. Samples were taken from adult bees each autumn and screened for P larvae by selective culture. Any colonies in which P larvae spores …

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