CXCL13 and neurosyphilis: Consistent with the antibody array data, the levels of CSF CXCL13, CXCL8 and CXCL10 were 45.9 (ranged from 0.09 to 341.42), 4.3 (ranged from 0.43 to 31.96), 7.2 (ranged from 0.37 to 67.16) fold higher in neurosyphilis patients than those in non-neurosyphilis patients, respectively.