 - Subject must be non-childbearing potential, i.e. either surgically sterilized or, if of child bearing potential, she must be using a highly effective method of birth control e.g., intrauterine contraceptive device; oral contraceptives; diaphragm or condom in combination with contraceptive jelly, cream or foam; Norplant; DepoProvera; contraceptive skin patch or cervical ring for 30 days prior to vaccination, have a negative urine pregnancy test and must agree to continue such precautions for two months after completion of the vaccination series. 