Sensitivity to avian purified protein derivative in cattle from farms having a high prevalence of swine mycobacteriosis.

On two farms in North Georgia a large percentage of the swine was infected with organisms of the Mycobacterium avium-intracellulare-scrofulaceum complex. The hypothesis that the cattle on these farms, which are maintained separately from the swine, would not be sensitive to avian purified protein derivative was rejected. It was concluded that the source of the M. avium-intracellulare-scrofulaceum complex of each animal population is environmental.