224 



TUBERCULOSIS 



it is necessary to keep tuberculous animals from entering the 

 healthy herds. If they are admitted and later the fact is dis- 

 covered, it is necessary to remove them and to thoroughly dis- 

 infect the stable. In eliminating the disease from a herd by 

 means of the tuberculin test, it is necessary to retest the non- 

 reacting animals after six months or a year have passed in 



M 



Fig. 55. Temperature curve of a tuberculous cow for 48 hours. The line 

 A. A. shows temperature for 24 hours preceding the injection of tuberculin, 

 which was injected at g. A. M., March 16 , b, 6, 6, shows the temperature 

 for the 24 hours after the tuberculin injection. 



order to find any case that might have been infected, but in 

 which the disease had not begun to develop, or cases that were 

 temporarily healed at the time of the first test. 



§ 157- The control of tuberculosis in cattle. Several 

 methods have been proposed to eliminate tuberculosis from 

 cattle. The preventing of the spread of the virus from the 

 diseased to the healthy animals is the most important precau- 

 tions. The system introduced by Prof. Bang of Copenhagen, 

 Denmark, and generally known as the Bang method, has 



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