A 10-year-old child is brought to the clinic for their routine check-up. The nurse reviews the child's immunization records and notes that the child received the DTaP (Diphtheria, Tetanus, and Pertussis) vaccine at age 4, but has not received the recommended Tdap (Tetanus, Diphtheria, and Pertussis) booster vaccine at age 11. The nurse educates the parents about the importance of completing the vaccination schedule.
Which of the following statements by the parents indicates a need for further teaching regarding the Tdap vaccine?