THE CAUSE OF EUROPEAN FOUL. BBOOD. 15 



As a conclusion, it is the belief of the Avriter that sufficient evidence 

 has now been obtained to justify the statement that BaeiUus 'phdoiv 

 is the primary exciting cause of a brood disease. This brood disease 

 is now generally known in America as European foul brood. This 

 opinion is rendered in accordance with views now generally accepted 

 relative to the etiology' of animal diseases. 



There are, then, three principal brood diseases. Two of these — 

 American foul brood, caused by Bacillus larvw^ and European foul 

 lirood, caused by Bacillus pluton — are known to be infectious. From 

 these two diseases there must be differentiated the third one, an 

 apparently noninfectious disorder, the so-called "pickled brood." 

 Larva' dead of this latter disease are practically free from micro- 

 organisms. The exciting cause of this disorder is not yet known. 



Approved : 



James Wilson, 



Secretary of Agrieulture. 



Washington, D. C, March 28, 1912. 



ADDITIONAL COPIES of this publication 

 -C\- may be procured from the Superintend- 

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