During a recent hepatitis B vaccination program among high-risk health care workers, the major sources of information about the vaccine were an in-service informational program, discussion with co-workers, and professional journals. Little or no information was obtained from the lay media or the product brochure. Two thirds of the personnel to whom the vaccine was offered accepted the vaccine. The major reason for accepting the vaccine was a perceived high-risk of contracting hepatitis B. In contrast, one third of the high-risk individuals offered the vaccine declined the opportunity. The major reason for not accepting the vaccine was concern with potential side effects. This information would have been helpful during the planning phase of the program.