Hence, the IP-10 results were defined as follows; the subjects with antigen dependent IP-10≥300 pg/ml (TB antigen–nil), irrespective of mitogen response were considered as positive; <300 pg/ml for antigen dependent IP-10 and ≥200 pg/ml for mitogen dependent IP-10 were considered as negative; others (<300 pg/ml of antigen dependent IP-10 for TB antigen and <200 pg/ml of mitogen dependent IP-10) were considered as indeterminate. The gene discussed is CXCL10; the disease is tuberculosis.