As you can see, it is possible the chica has chlamydia without knowing it. Also that NGU was caused by oral, vaginal, or anal sex with an infected partner.
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An estimated 2.8 million Americans are infected with chlamydia each year. Latex male condoms, when used consistently and correctly, can reduce the risk of transmission of chlamydia.
Chlamydia can be transmitted during vaginal, anal, or oral sex. Chlamydia is known as a "silent" disease because about three quarters of infected women and about half of infected men have no symptoms. If symptoms do occur, they usually appear within 1 to 3 weeks after exposure.
Women who have symptoms might have an abnormal vaginal discharge or a burning sensation when urinating. Some women still have no signs or symptoms; others have lower abdominal pain, low back pain, nausea, fever, pain during intercourse, or bleeding between menstrual periods. Chlamydial infection of the cervix can spread to the rectum.
Men with signs or symptoms might have a discharge from their penis or a burning sensation when urinating. Men might also have burning and itching around the opening of the penis.
In women, untreated infection can spread into the uterus or fallopian tubes and cause pelvic inflammatory disease (PID). This happens in up to 40 percent of women with untreated chlamydia. PID can cause permanent damage to the fallopian tubes, uterus, and surrounding tissues. Complications among men are rare.
Chlamydia can be easily treated and cured with antibiotics. A single dose of azithromycin or a week of doxycycline (twice daily) are the most commonly used treatments.
Source=CDC:
http://www.cdc.gov/std/Chlamydia/STDFact-Chlamydia.htm#diagnosed