Chlamydia trachomatis (CT) is the world's leading cause of sexually transmitted diseases (STD) and the most commonly reported STD in the U.S. and Texas. Chlamydia infection may result in pelvic inflammatory disease, complications such as ectopic pregnancy and infertility in women, in addition to epididymitis in men, pneumonia in infants, and even blindness. A peptide, or protein-based, vaccine candidate has been demonstrated to have a high degree of efficacy in two animal models of genital chlamydial infection.