After vaccination against paratuberculosis, using a whole cell inactivated vaccine containing M. paratuberculosis suspended in oil in the first month of life, an intradermal skin test with Johnin was done between the 6th and 12th month of life. After postmortem examinations on 154 animals, the results indicate that the stronger skin reactions occurred only in animals that were free of paratuberculosis using pathohistological, acid fast staining and cultural techniques, and that negative results in the skin test occurred relatively more frequently in animals found positive in postmortem examinations.