<qa>  How many healthy women will be assigned to the study group?The primary purpose of this study is to see if a herpes vaccine may prevent genital herpes disease in women who are not infected. The study will enroll approximately 7550 healthy women. These women will be randomly assigned to 1 of 2 possible study groups: herpes vaccine experimental group or hepatitis A vaccine control group. Participants will receive their assigned vaccine at 0, 1, and 6 months. Participants will have 9 scheduled study visits and additional unscheduled visits for an evaluation of herpes if it is suspected. Participants will be involved in study related procedures for up to 20 months. 