Cervical colposcopic images of a representative macaque (FH3) (10 × magnification). (A) Cervical mucosa (ectocervix) at baseline, characterized by normal, pink coloration, and presence of scant, clear normal menstrual-related discharge. (B) Cervical mucosa 7 days after administration of 1st Chlamydia trachomatis inoculum (1 × 106 IFU). Erythema, tissue vascularization (arrow), edema, and presence of mucopurulent discharge noted during visual inspection. (C) Cervical mucosa 4 days after administration of second C. trachomatis (1 × 106 IFU) and Trichomonas vaginalis (6 × 106 trichomonads) inoculums; 10 days post-infection, relative to 1st C. trachomatis inoculation. Findings include severe erythema and edema, areas of blistering erosion (arrows), and opaque, bubbly, mucopurulent discharge originating from the cervical os. IFU, inclusion-forming units.