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

When a child comes in for his vaccinations at age 4–6 years and presents with an incomplete history of 0–2 doses of DTaP vaccine, how do we determine how many more doses are needed?

You should try to achieve at least 4 total doses. Give additional doses of DTaP with 4-week intervals until you achieve 3 total doses. Then, if 6 months pass and the child has not turned seven years old, give the 4th dose of DTaP: if the child has turned seven years old, you may administer a dose of Tdap vaccine at that time.

Last reviewed: March 31, 2022

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