THE COW IN HEALTH AND DISEASE 95 



fail to get with calf; that cough and appear to 

 be weak and listless, can very safely be sus- 

 picioned as being tubercular. 



The Tuberculin Test. 



The only positive way of finding out whether 

 a cow has tuberculosis or not is to have her 

 tested by a competent veterinarian. In our 

 opinion no one save one who has had a veteri- 

 nary training can successfully make the tuber- 

 culin test, and for that reason we can not 

 give the method of making the test here. 



The tuberculin test has proven to be more 

 than 98 per cent correct from many thousands 

 of tests that have been followed by the post- 

 mortem on the tested animals. 



There are two methods of making this test 

 that are being used today; they are the tem- 

 perature test and intra-dermal test. In mak- 

 ing the temperature test which is the only one 

 recognized by the United States government 

 and many of the states, the tuberculin is in- 

 jected under the skin and beginning several 

 hours afterward the temperature is taken sev- 

 eral times at regular intervals. An elevation 

 of temperature of 2 degrees above the normal 

 temperature of the animal before the injection 

 of tuberculin is considered a reaction and the 

 cow is tubercular. In the other methods a very 

 small needle is used and a concentrated tuber- 

 culin is used and is injected between the two 

 layers of the skin. This injection is usually 



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