Chlamydia, better known for causing gynaecological problems for many women worldwide, is also, and possibly more importantly, the biggest preventable cause of blindness in the world. Blindness occurs as a complication of trachoma (chlamydia conjunctivitis).

Chlamydia trachomatis can cause genital infections, conjunctivitis, Pelvic Inflammatory Disease, pneumonia, urethritis, Fitz-Hugh-Curtis syndrome, Reiter's syndrome and Lymphogranuloma Venereum