Catch-up schedule for diphtheria, tetanus, and pertussis-containing vaccines for children age 4 months through 6 years who start late or are more than 1 month behind

Vaccine	Minimum age for dose 1	Minimum interval between doses
		Dose 1 to dose 2	Dose 2 to dose 3	Dose 3 to dose 4	Dose 4 to dose 5
DTaP or DT*	6 weeks	4 weeks	4 weeks	6 months^¶	6 months
DTaP is preferred unless there are contraindications to pertussis component				The minimum age for Dose 4 is 12 months	Dose 5 is not necessary if dose 4 was given at ≥4 years of age and ≥6 months after dose 3

DTaP: diphtheria and tetanus toxoids, and acellular pertussis; DT: diphtheria and tetanus toxoids.

* Refer to UpToDate content on diphtheria, tetanus, and pertussis immunization in children for details. As of early 2023, the sole manufacturer discontinued production and distribution of the DT vaccine.

¶ This dose may be counted as valid if the interval was ≥4 months and if the child was ≥12 months of age when it was received.

Adapted from: Centers for Disease Control and Prevention. Catch-up immunization schedule for children and adolescents who start late or who are more than 1 month behind. Recommendations for ages 18 years or younger, United States, 2023. Available at: www.cdc.gov/vaccines/schedules/hcp/imz/catchup.html. Accessed on February 15, 2023.

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Catch-up schedule for diphtheria, tetanus, and pertussis-containing vaccines for children age 4 months through 6 years who start late or are more than 1 month behind