DISEASE GERMS IN MILK 



89, 



creasing completeness of inspection and examination would 



inevitably seem to show that the disease is on the increase. 



For this reason, and for others that we need not mention, the 



statistics are open to criti- 



cism. In spite of the crit- 



icism, however, no one 



questions the general belief 



that this disease has been 



on the increase among cat- 



tle, though how rapidly we 



do not know. It is now 



agreed by all that tubercu- 



losis is, perhaps, the most 



serious problem that the 



dairyman has to face and 



one that threatens to un- 



dermine 



dustry. 1 



Tubercle Bacilli in Milk. So far as concerns our problems, 

 however, it is the relation of this tuberculosis to milk and the 

 distribution of the disease from animals to man that interests 

 us. The most important facts may be summarized, as follows: 



Animals suffering from tuberculosis may, under some con- 

 ditions, produce milk that contains tubercle bacilli. This has 

 been proved by studying the milk from such animals by two 

 methods: i. The inoculation of such milk into susceptible 

 animals, like guinea-pigs, results, in many cases, in the guinea- 

 pigs rapidly acquiring tuberculosis. 2 2. A microscopic study of 

 such milk has demonstrated the presence of tuberculosis bacilli. 



ig- 37-) Although the microscopic examination of milk may 



the whole in- 



FIG. 37 TUBERCULOSIS BACILLI 

 (LEHMANN & NEUMANN) 



* Markl. Milchztg., p. 232, 1901. 



Beck. Zeit. f. Fleisch u. Milch Hyg., xi., p. 245, 1901. 

 2 Mohler. Bui. 44, Bu. An. Ind., 1903. 



Schroeder and Cotton. Bui. 86, Bu. An. Ind., 1906. 



Schroeder and Cotton. Bui. 88, Bu. An. Ind., 1906. 



