Q. A 27-year-old woman presents to the obstetric clinic for a routine antenatal visit at 27 weeks' gestation. This is her second pregnancy, and she has had an uneventful prenatal course thus far. Her first child was delivered at term without complications, and she has no significant past medical history. She is up to date with all of her vaccinations except for the ones recommended during pregnancy. She inquires about any vaccinations she should receive during her current pregnancy. On examination, her blood pressure is 120/78 mmHg, heart rate is 68 bpm, and fetal heart rate is 140 bpm. The physical examination is otherwise unremarkable. Her complete blood count, blood glucose levels, and urine analysis are within normal limits. Which of the following vaccines should be administered to the patient during this visit?