CXCL10 and neurosyphilis: The CSF CXCL10 level in neurosyphilis patients (median 426.55 pg/ml, ranged from 31.2 to 5603.2 pg/ml) were significantly higher than that in non-neurosyphilis patients (median 44.76 pg/ml, ranged from 31.2 to 859.2 pg/ml, p = 0.000) (Fig. 2C).