The mean (SD) values of serum lysozyme level for patients with AS, BD, presumed sarcoidosis, presumed latent TB, presumed latent syphilis and control group were 14.096 (4.586), 14.244 (5.358), 20.712 (6.780), 15.259 (8.516), 14.018 (6.679) and 12.927 (4.720) mg/L respectively (Table 3). The gene discussed is LYZ; the disease is latent syphilis.