The first visit will be to determine if the participant is eligible for the study. If eligible, the participant will receive one dose of vaccine at each of the following three visits. The fifth visit will be to collect blood to determine whether the participant has responded to the 3-dose vaccination protocol. The sixth visit will be to discuss the outcome of the vaccination with the participant. Participants who respond favorably to the 3-dose vaccine protocol will exit the study at this point. However, if a participant fails to respond to the initial 3-dose vaccine protocol, he or she may restart the regimen and receive another 3 doses of vaccine following the same schedule as before but off protocol.