Health care personnel with frequent blood contact are at high risk for being exposed to and developing hepatitis B infection. Exposure to unidentified infectious patients may lead to personnel inadvertently foregoing appropriate, passive immunoprophylaxis. For these reasons, our hospital elected to conduct an aggressive program to administer hepatitis B vaccine to all employees at high risk for exposure to hepatitis B virus, thus protecting such employees from inadvertent occupational exposure. Administrators agreed to offer the vaccine as a free employee health benefit. "High-risk" employees attended mandatory inservice presentations covering hepatitis B disease, vaccine safety and efficacy, and related concerns. High-risk individuals were required to either receive vaccine or sign "informed refusal" forms. The vaccine clinic was organized to accommodate employee work schedules. Of high-risk employees eligible for vaccination, 90% completed a three-dose vaccine course. Extensive inservice education, financial and administrative support, and careful advance planning are all crucial in achieving high compliance with vaccination programs. A description of key steps in designing a successful vaccination program is outlined.