TUBERCULOSIS IX SWIxXE 



145 



tuberculosis in cattle or on tuberculous viscera they readily be- 

 come infected. Infection through the respiratory tract, while 

 it is certainly possible, seems to be rare. The piggeries where 

 the refuse from butter and cheese factories is fed and those 

 which adjoin abattoirs supply the majority of animals found 

 on post-mortem to be tuberculous. 



®-^®oo5»®£? 



■3 ~'X'@,<;\? -Tw-ic 



-* «,:-.® ~^^. 9 © i.'a v>^ » ® ^i> ^.-i.-^j :.. O^^A Al ® . 



of iOJl*^/». ^ 



Fig. 31. A drawing of a section of a very young tubercle in spleen. 

 { Thoma). 



Ostertag has called special attention to this disease as 

 existing among swine in certain parts of northern Denmark 

 and Germany, where there was much tuberculosis in cattle, 

 and where swine were fed upon the slime from creamery sepa- 

 rators. Experiments show the possibility of infection by 

 means of the sputum of tuberculous people. 



In the cases which have come to our notice there is very 

 strong evidence that the swine were infected by being fed upon 

 milk from tuberculous cows. In one of these cases, the tuber- 

 culin test showed that a large number of the cows from which 

 the milk was obtained were affected. 



