What sort of disease is a chlamydia infection?

Sexual transmitted: Chlamydia is a sexually transmitted disease. Both men and women can get this disease. It is caused by a bacteria that can infect the urethra (what we pee out of), causing pain, especially when urinating) and often a brown, foul-smelling discharge from the penis or vagina. It is easily treated with antibiotics. Untreated, it can cause bladder and uterus infections, and even sterility.