MILK-BORNE DISEASES 

 Table V 



135 



Statistics relating to the prevalence of tubercu- 

 losis in cattle vary considerably, according to the 

 system of inspection adopted in various countries 

 and states and the degree of thoroughness with which 

 the work is done, as well as to climatic conditions 

 and other causes. The tuberculin test is by no 

 means always efficiently employed. Professor Doane '" 

 found in Southern cities that the test was obviously 

 very poorly applied. He found that in Norfolk, 

 Va., for instance, less than one per cent of the number 

 of cows examined were reported to be infected, an 

 incredibly low percentage under any circumstances, 

 and all the more incredible when it is remembered 

 that nlost of the Norfolk cows had been imported 



