PATHOGENIC BACTERIA AND DISEASES 45 



to reverse the experiment and inoculate human beings 

 with the bovine variety. 



Pigs, monkeys, rabbits, and most other animals are sus- 

 ceptible to the bovine variety, and it seems unlikely that 

 man alone should be exempt. Local infections of the 

 skin with the bovine variety have occurred in butchers, 

 but the infection has differed in its manifestations from 

 similar infections with the human type. The case has 

 not been proved, however, and until more definite data 

 is at hand, every precaution should be taken to prevent 

 infection with the bovine type of the disease. 



The source of bovine infection, if it does occur, is 

 not direct from the udder to the milk, except in rare 

 instances of tuberculosis of the udder, but indirectly, 

 by way of the intestinal canal. The most frequent seat 

 of the disease in cows, as in man, is in the lungs. The 

 cow does not expectorate the material coughed up, but 

 swallows it. The feces are, therefore, teeming with the 

 germs in an infected cow. Unless great care is exercised 

 in stabling and milking, the milk is easily contaminated 

 with the feces, which may be found in the dust and air 

 of the stable. 



The sputum of tuberculous patients should be received 

 in paper sputum cups and destroyed by burning. All 

 discharges from tuberculous foci should be destroyed. 

 Fresh air and sunlight are detrimental to the growth and 

 development of the germ and should be courted ac- 

 cordingly. Out-door sleeping and living, winter and 



