- Have a negative QuantiFERON®-tuberculosis (TB) Gold test, defined as early secretory antigenic target (ESAT)-6 response minus nil response < 0.35 IU/ml, CFP-10 response minus nil response <0.35 IU/ml, nil response less than or equal to 0.7 IU/ml, and mitogen response greater than or equal to 0.5 IU/ml.