HBV transmission occurs primarily among unvaccinated adults with risky behavior (e.g., heterosexuals with multiple sex partners, injection-drug users [IDUs], and men who have sex with men [MSM]). During 1990-2005, incidence of acute hepatitis B in the United States declined 78 percent, primarily with children and adolescents who got the vaccination. In this photo: Andy Yeoh of National Disaster Medical System in Tuscon, AZ, prepares an immunization shot for Hepatitis A at medical camp in Chalmette, LA which was heavily damaged by Hurricane Katrina.
Kuni Takahashi/Chicago Tribune
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