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  • Diphtheria
  • Vaccine Recommendations
  • Pertussis
  • Vaccine Recommendations
  • Tetanus
  • Vaccine Recommendations

My 7-year-old patient has had only 1 dose of tetanus toxoid-containing vaccine at 11 months of age (a dose of DTaP). The catch-up schedule says he needs 3 additional doses of tetanus toxoid-containing vaccine (4 total). Why 4? If he were completely unvaccinated on the seventh birthday, he would only need a total of 3 doses.

If the first dose of a tetanus toxoid-containing vaccine is administered before the first birthday, 4 doses are necessary before beginning the 10-year cycle of booster doses. If the first dose is administered after the first birthday, 3 doses are necessary. The final dose should be spaced 6 months from the previous dose.

Last reviewed: March 31, 2022

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