TUBERCULOSIS 



283 



creased respiration, diarrhea, and -a local swelling at the 

 point of injection. The thermal reaction is, however, most 

 constant, and since it is easily detected by taking the tern- 



Fig. 49. Injecting Tuberculin 



The diagnostic agent is injected beneath the skin of the neck or shoulder 



perature, it is the characteristic on which the greatest reli- 

 ance is placed. 



Details of the tuberculin test. In testing an animal, a 

 series of temperatures should be taken before the tuberculin 

 is injected, to determine the normal range, and to note espe- 

 cially whether any abnormal condition obtains. The tem- 

 perature is taken by means of a clinical thermometer in- 

 serted in the rectum. The temperature of the bovine varies 



