Chlamydia 

Chlamydia is caused by Chlamydia trachomatis and is one of the most common sexually transmitted diseases. This infection is easily spread because it often has no associated symptoms and may be unknowingly passed to sexual partners. In fact, about 50 percent of men who contract chlamydia are without any symptoms. Since it is such a silent STD, detection is not always so easy. Usually a diagnosis is made after a routine STD screening or after you've been made aware that your partner has been infected. When symptoms do occur, they usually begin within one to three weeks of contact and can include the following:

* Small amounts of clear or cloudy discharge from the tip of the penis

* Painful urination

* Burning and itching around the opening of the penis

* Pain and swelling around the testicles

Like gonorrhea, chlamydia is diagnosed with either a urethral swab or a urine sample. Typically, everyone should be treated when they present with the above symptoms. It is common practice to treat for both organisms at the same time, and abstinence from sexual activity for at least one week is strongly advised. All recent sexual partners should be made aware of your diagnosis. Treatment consists of either a single dose of azithromycin or a week of doxycycline (twice daily.) Consequences of untreated chlamydia are almost the same as for gonorrhea.