 5. Females who are not surgically sterile or post-menopausal must have a negative urine pregnancy test immediately prior to vaccination and be willing to use oral, implantable, transdermal or injectable contraceptives or another reliable means of contraception approved by the Investigator intrauterine device, female condom, diaphragm with spermicidal foam, cervical cap, use of condom by the sexual partner or a sterile sexual partner, or abstinence from screening until the blood sample on Day 120. 