The term Chlamydia typically refers to Chlamydia trachomatis, the STD. But two other types of these bacteria also can lead to illness: Chlamydia pneumoniae, which can be spread through coughing and sneezing, and Chlamydia psittaci, which birds can pass to humans. Chlamydia can be treated with antibiotics. But in many cases, it causes no symptoms, so people can be infected without even knowing it. If Chlamydia infections go untreated, they can lead to more serious health problems, such as infertility. Even though symptoms of Chlamydia are usually mild or absent, serious complications that cause irreversible damage, including infertility, can occur "silently" before a woman ever recognizes a problem. Chlamydia also can cause discharge from the penis of an infected man.
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