Chlamydia is a sexually transmitted disease (STD) caused by the bacteria Chlamydia trachomatis. Chlamydia is recognized as one of the most common and damaging of all STDs in the U.S. today. Anybody who has unprotected sex can be infected with chlamydia. Nearly all chlamydia infections are sexually transmitted, except those of newborns, who may acquire this infection from their mother during birth.

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