Which of the following vaccines should a nurse plan to immunize a client who is at 30 weeks of gestation with? (Select all that apply)

Choice A reason: The Tdap vaccine (diphtheria-acellular pertussis) is recommended at 27-36 weeks to transfer maternal antibodies, protecting newborns from pertussis. Pertussis causes severe respiratory illness in infants, and maternal immunization boosts IgG antibodies, crossing the placenta to provide passive immunity until the infant’s vaccination, per immunological guidelines. Choice B reason: Varicella vaccine, a live-attenuated virus, is contraindicated in pregnancy due to theoretical fetal risks. Live vaccines can cross the placenta, potentially causing congenital varicella syndrome, affecting fetal development. Vaccination is deferred until postpartum to avoid these risks, as the immune response could harm the fetus, per obstetric immunization protocols. Choice C reason: Human papillomavirus (HPV) vaccine is not recommended during pregnancy, as its safety is unestablished. HPV vaccination prevents cervical cancer, not perinatal infections, and is deferred until postpartum. The vaccine’s inactivated nature poses no direct fetal risk, but lack of pregnancy-specific efficacy data prioritizes other vaccines like Tdap and influenza. Choice D reason: Measles, mumps, and rubella (MMR) vaccine, a live-attenuated virus, is contraindicated in pregnancy due to risks of congenital rubella syndrome, which causes fetal anomalies. The immune response could theoretically affect fetal development, so vaccination is postponed until postpartum to ensure maternal immunity without compromising fetal safety, per immunization guidelines. Choice E reason: Inactivated influenza vaccine is recommended during pregnancy, ideally in the second or third trimester, to protect against flu-related complications. Influenza increases maternal morbidity and preterm birth risk. The vaccine stimulates IgG production, crossing the placenta to provide neonatal immunity, reducing respiratory illness risks in both mother and infant, per obstetric protocols.