LYZ and latent syphilis: There were no significant differences of serum lysozyme levels between AS and BD (p = 1.000), between AS and presumed latent TB (p = 1.000), between AS and presumed latent syphilis (p = 1.000), between BD and presumed latent TB (p = 1.000), between BD and presumed latent syphilis (p = 1.000), and between presumed latent TB and presumed latent syphilis (p = 1.000) (Table 5).