<qa>  What is the negative serum or urine beta human chorionic gonadotropin?- Volunteers who were born female: negative serum or urine beta human chorionic gonadotropin β-HCG pregnancy test performed prior to vaccination on the day of initial vaccination. Persons who are NOT of reproductive potential due to having undergone total hysterectomy or bilateral oophorectomy verified by medical records, are not required to undergo pregnancy testing. 