84 PRINCIPLES AND PRACTICE OF MILK HYGIENE 



losis commission found the faeces infectious from tuber- 

 culous cows which did not show any clinical symptoms, 

 but these results have not been confirmed by others. 

 Titae, Thieringer and Jahn 15 demonstrated tubercle 

 bacilli in the f seces of cows affected with open pulmonary 

 tuberculosis, but not in the fasces of reacting cows which 

 did not show clinical symptoms. Traum 16 inoculated 

 guinea pigs with fecal material from 36 cows, " prac- 

 tically all tuberculin reactors," and none of the guinea 

 pigs was infected with tuberculosis, although two of the 

 cows exhibited physical symptoms of disease of the lungs. 

 These results correspond with those obtained when 

 samples of mixed milk from herds known to be infected 

 with tuberculosis have been examined for tubercle bacilli. 

 For example, O. Miiller examined samples of milk from 

 1598 herds in East Prussia and tubercle bacilli were 

 demonstrated in the samples from only 97 herds, al- 

 though non-clinical reactors were present in the other 

 herds. In the 97 herds from which the samples contain- 

 ing tubercle bacilli were obtained, cows were found which 

 exhibited clinical symptoms of udder tuberculosis or 

 other forms of the disease. Similar results could be 

 cited. Reichel 17 found the faeces infectious from cows 

 which were not tuberculous but which were stabled with 

 cows affected with open tuberculosis. It therefore ap- 

 pears probable that the sputum coughed out by cows 

 with open tuberculosis, or the fine spray expelled from 

 the mouth in coughing, may contaminate the feed of other 



15 Arbeit. K. Gesundheitsamt, pp. 1-34, No. 1, 1913. 



16 Annual Report University of California Expt. Station, 

 1915, p. 40. 



17 Verbal communication. 



