- If the subject is a female of childbearing potential, she must use adequate contraceptive precautions (e.g., intrauterine contraceptive device, oral contraceptives or other equivalent hormonal contraception) for 2 months prior to vaccination and continue to use such precautions for a minimum of three months after vaccination. She must also have a negative urine pregnancy test within 24 hours prior to receiving study vaccine. Women at least one year post-menopausal or surgically sterile will not be considered of childbearing potential.