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Chlamydia infection is caused by the bacterium Chlamydia trachomatis. It is spread during vaginal, anal, or possibly oral sex with an infected partner. A pregnant woman may spread the infection to her newborn during delivery.
You can spread chlamydia even if you do not have symptoms of infection. You can spread the infection until you have been treated.
Most women and men with chlamydia do not have symptoms.1
The time between exposure to chlamydia and the start of symptoms—the incubation period—may range from days to months. If symptoms appear, it is usually 1 to 3 weeks after sexual contact with an infected person.
Symptoms in women
Symptoms in men
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