LECTURE XXXIX 

 TUBERCULOSIS 



The importance of the tuberculosis question is evidenced by 

 its widespread prevalance, human susceptibility to bovine in- 

 fection, great financial losses, direct and indirect, and its dis- 

 turbance of breeder's plans. 



Prevalence. — Tuberculosis is one of the most widespread and 

 universal diseases affecting either humanity or domestic ani- 



FiG. 65. — Bovine Tubkrculosis. (M. H. B.) 

 A case showing plain symptoms of disease. Rare type. 



mals. It affects all of the domestic animals. Prevalence is 

 greatest in the various classes of animals in the order named : 

 cattle, hogs, horses and sheep. Chickens are also quite sus- 

 ceptible to avian tubercle bacilli. 



Cause. — No fact in medicine is better established than that 

 tuberculosis is caused by the Bacterium of tuberculosis. We 

 cannot have tuberculosis without these germs, and it is prob- 



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