ACE and latent syphilis: The mean (SD) values of serum ACE for patients with AS, BD, presumed sarcoidosis, presumed latent TB, presumed latent syphilis and control group were 29.363 (2.012), 31.227 (15.225), 58.164 (35.110), 33.061 (15.065), 30.527 (16.016) and 20.704 (7.962) U/L respectively (Table 3).