BCG with the Tuberculin

BCG is a loss of virulence, but retained antigenicity of tuberculosis, can stimulate the body to produce specific immunity tuberculosis, BCG vaccination of children will have a positive tuberculin. BCG vaccination but not within the three-year-old children with tuberculin positive, even if normal chest x line, it should have a high degree of suspicion of its activities in TB lesions. On the contrary, even if immunocompromised persons had tuberculosis, tuberculin test is still possible negative results.