The CDC discovered that hepatitis B is sexually transmitted

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In 1971, the U.S. Centers for Disease Control and Prevention (CDC) discovered that hepatitis B is sexually transmitted. CDC and the Advisory Committee on Immunization Practices (ACIP) recommend the hepatitis A vaccination for men who have sex with men. Sexually active adults are not considered at risk for hepatitis A unless they live with or are having sex with an infected person, inject drugs or have chronic liver disease.

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Source: U.S. Centers for Disease Control and Prevention
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