                                      HCC/0000--0000            Serofast group/00 cases       Healthy group/00 cases; Serological cure/00 cases    T-lymphocyte subset and NK cells in the peripheral blood                                          Flow cytometry             In this study, the levels of T-lymphocyte subset and NK cells in the peripheral blood of serofast patients, syphilitic patients whose serology turned negative after treatment, and healthy controls were compared.   00                     