For example, using a CXCL10-stimulated threshold of 8500 pg/ml for a positive result in addition to those who had TB Ag – Nil >0.35 IU/ml to define a positive test gave sensitivity for detecting TSTc of 61.9%, sensitivity for TST+ of 86.0%, and specificity for TST- of 78.7%. The gene discussed is CXCL10; the disease is tuberculosis.