CD4 and chlamydia trachomatis infectious disease: In the current study, we reassessed CD8 T cell responses in protective immunity to chlamydia in women from the same cohort previously evaluated for reinfection5 by using C. trachomatis plasmid gene protein 3 (Pgp3) and major outer membrane protein (MOMP) peptide pools including peptide lengths shown to represent a good compromise for stimulating both CD4 and CD8 T cells.7