The study vaccine is administered as an intramuscular injection. Enrolled subjects will receive the study vaccine every 14 days (at day 0, 14, 28 and 42). Subjects will know their study vaccine assignment. Participants who are not allergic to Japanese red cedar will be assigned to Group 1. Participants who do have an allergy to Japanese red cedar or Mountain Cedar will have an equal chance of being assigned to Group 2 or 3.