IL17A and chlamydia trachomatis infectious disease: However, when looking at the vaginal secretion IFN-γ response of the women in our cohort, although not significantly different, we did find that women with repeated chlamydial infections (CT-RP) actually had reduced levels of IFN-γ, as well as IL-17 (Figures 2D,E), in comparison with Chlamydia negative women.