infectious diseases
Chlamydia
Chlamydia trachomatis
C. trachomatishas 18 immunologically defined serovars: A, B, Ba, and C cause the eye disease Trachoma . D through K cause sexually transmitted infections (STIs) localized to mucosal surfaces. L1, L2, and L3 cause STIs that lead to invasive lymph node disease ( Lymphogranuloma Venereum (LGV) ). In the United States,C. trachomatisis the most common bacterial cause of STIs, including Chlamydia and Mycoplasmal Mucosal Infections and Cervicitis , urethritis, and Proctitis , causes Neonatal Conjunctivitis and The organism can be isolated from the rectum and throat in adults (usually in men who have sex with men [MSM]). Rectal infection with L2 strains can cause severe proctocolitis that can mimic acute inflammatory bowel disease in MSM who are HIV-positive. 