<qa>  What is the term sexual abstinence not applicable?- All male and female subjects must agree to practice a form of effective contraception, such as barrier contraception ie, condom plus spermicide, a female condom, diaphragm, cervical cap or intrauterine device, implants, injectables, combined oral contraceptives or sexual abstinence prior to entering into the study, for the duration of the vaccination period and for 28 days after the last study vaccination. For Germany: The phrase sexual abstinence is not applicable, with the understanding that all male and all female subjects of childbearing potential must practice an effective form of contraception during the study. 