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  • Diphtheria
  • Scheduling Vaccines
  • Pertussis
  • Scheduling Vaccines
  • Tetanus
  • Scheduling Vaccines

If a child has already received 5 doses of DTaP by their fourth birthday (with the appropriate 6-month intervals between #3 and #4 and also between #4 and #5), is a booster dose after the fourth birthday necessary?

In general, a child should receive no more than four doses of DTaP before 4 years of age (preferably by 2 years of age). The ACIP recommends that a dose of DTaP be given at 4–6 years of age. Many states have school immunization laws which also require at least one dose of DTP/DTaP on or after the fourth birthday. This dose is important to boost immunity to pertussis.

Last reviewed: March 31, 2022

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