Chlamydia (Chlamydia trachomatis) is one of the most widespread sexually transmitted diseases, especially among adolescents. There are numerous healthy male carriers. Adolescents are particularly at risk of contagion due to the immaturity of the cervix, which is more fragile and delicate than that of an adult woman.

The infection is caused by bacteria of the genus Chlamydia. It can be recognized using a swab or blood test. It can be easily treated and cured with antibiotics, provided that all partners do the treatment properly, abstaining from sexual intercourse throughout the duration of the treatment. it's good to go for a check up 3-4 months after you have completed the antibiotic treatment to make sure everything is fine.
If not treated appropriately and right away, Chlamydia can cause serious complications, including infertility. 

Chlamydia can be asymptomatic in the beginning, but within a few weeks it can spread from the vagina to the cervix, the urethra, and progressively trace down Fallopian tubes, causing abnormal whitish/yellowish discharge or bleeding in between menstrual cycles. It also causes burning during urination, nausea and fever, as well as back and lower abdomen pain that increases during sexual intercourse. After oral sex, pain and burning may occur in the throat.  

Fallopian tube infections are common in young girls. They may not have many symptoms and may not seem worrisome, but they are particularly dangerous. These may in fact be a cause of ectopic pregnancies, where the embryo is implanted in one of the two tubes and not in the uterus as it should be, with the risk of severe acute bleeding that may also be fatal.

Chlamydia may reoccur within two years of the first infection in 35% of girls, causing tube lesions, pelvic peritoneal infections and intense pain upon penetration. The most feared consequence is pelvic inflammatory disease (PID), a serious disease that can cause permanent damage and is one of the major causes of female infertility.

Unfortunately, experts say that even after a first infection, adolescents don't learn to use condoms. In the case of Chlamydia, this is very risky behavior for a woman's future health, not only from a reproductive point of view.