| secondary syphilis in cali, colombia: new concepts in disease pathogenesis. | venereal syphilis is a multi-stage, sexually transmitted disease caused by the spirochetal bacterium treponema pallidum (tp). herein we describe a cohort of 57 patients (age 18-68 years) with secondary syphilis (ss) identified through a network of public sector primary health care providers in cali, colombia. to be eligible for participation, study subjects were required to have cutaneous lesions consistent with ss, a reactive rapid plasma reagin test (rpr-titer > or = 1 : 4), and a confirmatory ... | 2010 | 20502522 |