The CDC reports trichomoniasis as the most common curable STD. Trichomoniasis is a nonviral sexually transmitted infection caused by a parasite called Trichomonas vaginalis. A positive test for HBV DNA is needed for proper diagnosis and treatment. If HBV antigens are detected, another test, HBV DNA (also known as polymerase chain reaction or PCR testing), is performed. Negative results indicate no antigens were found and may suggest that there is no active or past infection. Screening is performed with a hepatitis B surface antigen (HBsAg) test that detects whether these HBV-specific antigens are present in the bloodstream. HBV antigens cause the body's immune system to react and make antibodies. There is no cure for HBV, but vaccination can prevent infection. Chronic infections may significantly impair liver function and lead to serious health conditions, such as severe liver scarring (cirrhosis) and liver cancer. Initially, HBV can cause flu-like symptoms, nausea, aching joints, persistent fatigue, and jaundice (yellowing of the eyes or skin). Hepatitis B can be a short-term infection for some people, but for many others, it may become a long-term, chronic condition. Approximately 90% of infants who become infected with HBV are likely to develop a chronic infection. Hepatitis B is an infection of the liver caused by the hepatitis B virus (HBV), which is spread from person to person by mixing bodily fluids through sexual contact and sharing needles. Infertility may result in both men and women. In women, untreated chlamydia can spread to reproductive organs and can cause pelvic inflammatory disease (PID) and ectopic pregnancy. In men, untreated chlamydia can spread to the testicles and epididymis (tubes that carry sperm from the testicles). It can stay within the body for years without symptoms, and may flare up and cause serious complications. If chlamydia is not treated, it usually does not go away on its own. Chlamydia can be treated with antibiotics.

For men, testing for chlamydia is usually done with a physician-collected swab for women, with a physician-collected or self-collected vaginal swab or, for both men and women, a sample of urine. However, some men and most women with chlamydia may never experience symptoms, which makes it underreported and very easy to spread from person to person. The CDC reports chlamydia as the most commonly reported STD in the United States. Chlamydia is a bacterial sexually transmitted infection (STI) caused by Chlamydia trachomatis.

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