Catch-Up Vaccination for Children with Incomplete DTaP Series
Age-Appropriate Vaccine Selection
- The Centers for Disease Control and Prevention recommends that an 8-year-old child who has received only one dose of DTaP should receive Tdap immediately as the next dose, followed by Td at least 4 weeks later, and a final Td dose 6-12 months after the second dose, for a total of 3 doses to complete the series 1, 2
- At 8 years old, this child should receive Tdap (not DTaP) for catch-up vaccination because DTaP is not indicated for persons aged ≥7 years 1, 2, 3
- The first dose in the catch-up series should preferably be Tdap, with subsequent doses using Td vaccine 1, 2
Complete Catch-Up Schedule
- The recommended 3-dose series consists of Tdap as the first dose, followed by Td at least 4 weeks later, and a final Td dose 6-12 months after the second dose 1, 2
- The schedule is as follows:
Critical Principle: Never Restart the Series
- The single DTaP dose this child received previously counts toward the series and should not be discarded 1, 2, 4
- The vaccination series does not need to be restarted regardless of how much time has elapsed between doses 1, 2, 4
- Only 2 additional doses are needed to complete the 3-dose primary series 1
Important Consideration for Adolescent Booster
- Because this child will receive Tdap at age 8 years as part of catch-up, an additional adolescent Tdap booster dose should still be administered at age 11-12 years 1, 2, 5
- This is a specific ACIP recommendation for children aged 7-10 years who receive Tdap during catch-up vaccination 1, 2, 5
Common Pitfall to Avoid
- Do not confuse Td with Tdap when ordering vaccines for this age group 6
- Providers should carefully review product labels before administration, as packaging may appear similar 7, 6
- Do not give DTaP to this 8-year-old child, as it is not licensed or indicated for children ≥7 years old and contains higher amounts of diphtheria toxoid associated with increased adverse reactions in older persons 7, 3