PKN1 and chlamydia trachomatis infectious disease: The present study contributes to this direction by analysing the seroprevalence of potential chlamydial antigens, serine threonine protein kinase (STPK, i.e., Pkn1) and DNA ligaseA (LigA) in chlamydia-infected human patients and nonhuman primate (Macaca nemestrina) model of CT infection.