TUBERCULOSIS 



291 



of the base of the tail. 

 In tubercular auinials 

 the injection is followed 

 by a characteristic local 

 swelling. The ophthal- 

 mic test is sometimes 

 used. 



The control of tu- 

 berculosis is largely in 

 the hands of the breeder 

 and dairyman. This is 

 a disease that requires 

 the cooperation of stock- 

 men and sanitary offi- 

 cers in the application 

 of control measures. If 

 there are several open 

 cases of tuberculosis in 

 a herd of cattle, the ap- 

 plication of the tubercu- 

 lin test, removal of the 

 reacting animals and 

 disinfection of the 

 premises are not suffi- 

 cient to eradicate the 

 disease. It is necessary 

 to repeat the tuberculin 

 test wathin six months, 

 and later at twelve- 

 month intervals, until 

 none of the animals that 

 remain in the herd re- 

 act. ■ 



The most practical 



Fig. 94. — A tubercular gland that is split open. 



Fig. 95. — Caul showing tuberculosis. 



Fig. 96. — Foot of hog showing tuberculosis of joint. 



