Using Urine to Study Antibodies & Functional Cell-Mediated Immunity in the Context of Chlamydia Trachomatis

Inclusion Criteria: * Female * Chlamydia trachomatis NAAT positive vaginal sample or first-void urine sample. * Able to understand the information brochure and what the study is about. * Willing to give informed consent to use their samples for details described in the study protocol. Exclusion Criteria: * Pregnancy (self-reported) * Being positive for Human Immunodeficiency Virus (HIV) * Women that underwent hysterectomy. * Menstruation at the time of sample collection. * Current use of antibiotics effective against Chlamydia trachomatis (doxycyline or azithromycine) or use of such antimicrobials in the past 14 days before participating in the study. * Participating in another clinical trial at the same time of participating in this study. * Having a history or current evidence of any condition or abnormality that might confound the results of the study or is not in the best interest of the individual to participate, in the opinion of the investigator.