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Chlamydia is the most common bacterial STI. Chlamydia trachomatis is the name of the bacteria that causes Chlamydia. Symptoms include abnormal discharge and a burning sensation when peeing. For males, it can also include pain and swelling in one or both testes. If you are pregnant and have chlamydia, it can cause an eye infection, pneumonia, or an early delivery. Long-term effects of chlamydia women may develop pelvic inflammatory disease and can experience abdominal pain. It can also cause women to become infertile or have ectopic pregnancies. It is treated with a round of antibiotics.