Chlamydia is a sexually transmitted disease that people contract primarily through anal, oral and vaginal intercourse, according to WebMD. Pregnant women are also capable of passing chlamydia to their unborn children during vaginal childbirth.
The bacterium Chlamydia trachomatis causes chlamydia, according to WebMD. This same bacterium causes conjunctivitus if spread to the eye through a contaminated hand. Ejaculation does not need to occur for chlamydia to spread, and previous treatment for chlamydia does not inhibit it from infecting the same person more than once, as noted by the Centers for Disease Control. Sexually active young people are at higher risk of contracting the disease.