Infection of Milk. 



69 



hogs following tuberculous steers in the feeding lots 

 are very likel} T to acquire the disease is explained by 

 the presence of tubercle organisms in the manure of 

 such animals. 



It must be kept in mind that many animals may be 

 infected with tubercle bacilli and therefore have tuber- 



FIG. 18. A TUBERCULOUS ANIMAL. 



The last stages of generalized tuberculosis. Note the emacia- 

 ted condition. 



culosis in the incipient stages, without their being able 

 to disseminate the disease to others. In the early 

 stages, they are bacillus-carriers without being neces- 

 sarily dangerous at that particular time, but the pos- 

 sibility always exists, as the disease develops in the sys- 

 tem, that the trouble may assume a more formidable 

 character, and that slowly developing chronic lesions 

 may become acute, and "open," in which case, the af- 



