Final answer:
Children receive the Dtap vaccine series and switch to a single dose of tdap vaccine at age 11 or 12, followed by a Td booster every 10 years.
Step-by-step explanation:
The transition from Dtap to tdap occurs around the age of adolescence. According to the Centers for Disease Control and Prevention (CDC), children should receive the Dtap vaccine at 2, 4, 6, and 15-18 months of age, with a further dose at 4-6 years old. After completing the Dtap series, it's recommended to switch to tdap at age 11 or 12. This one-time dose of tdap serves as a booster that continues protection against tetanus, diphtheria, and pertussis for adolescents. Subsequently, a Td booster is then given every 10 years to maintain immunity.