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.

In 1991, “the ACIP recommended a comprehensive strategy to eliminate HBV transmission in the United States, including universal vaccination of infants” using recombinant hepatitis vaccine on all newborn infants and children in the United States.