Cutaneous Reactivity to Tuberculin in the Dog. ∗

Abstract

Summary

Thirty normal dogs tested repeatedly with 1:100 tuberculin have given negative reactions. Forty-two dogs with tuberculous lesions have given positive reactions to the intracutaneous injection of tuberculin in doses of 1:100 to 1:10,000. Three dogs gave doubtful or negative reactions; one of these animals has been necropsied and showed no gross evidence of tuberculosis. Six dogs previously positive to tuberculin have given negative or doubtful reactions from 1 to 3 months before death; necropsies invariably revealed extensive tuberculosis. Other than this there has been no apparent correlation between the degree of cutaneous sensitivity and the extent of the tuberculous lesion.