Diphtheria-Tetanus-Pertussis Vaccine Recommendation at Age 6

During a routine well-child visit, a nurse reviews the patient's immunization history. The child is currently 6 years old and has received all age-appropriate vaccines up to 5 years. According to the current CDC immunization schedule, the nurse prepares to administer the ______ vaccine, as it is recommended for children at the age of 6, along with any catch-up doses for missed vaccines.

Which vaccine is primarily emphasized for school-age children, specifically at 6 years old, to prevent a serious bacterial infection?