A common sexually transmitted infection caused by a bacteria. Chlamydia infections can occur in the vagina, penis, anus, mouth, throat and eyes. It is carried in semen, pre-cum and vaginal secretions, which means a man does not need to ejaculate for him to spread Chlamydia. However, using a condom can greatly decrease the chances of spreading this sexually transmitted infection. Chlamydia is one of the most prevalent sexually transmitted infections, with almost 3 million new cases in the United States each year. Chlamydia is called a silent STD because most people who have it don’t have symptoms, yet it can cause women to become infertile and it can increase the chances a woman will have an ectopic pregnancy, which can endanger her life. Chlamydia can easily be treated with antibiotics, assuming both partners take them.