Catch-up Immunization Schedule

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The tables below provide catch-up schedules and minimum intervals between doses for children whose vaccinations have been delayed. A vaccine series does not need to be restarted, regardless of the time that has elapsed between doses. Use the section appropriate for the child’s age. Always use these tables in conjunction with schedule for persons age 0 through 18 years and the footnotes that follow.

Children age 4 months through 6 years

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
Hepatitis B1	Birth	4 weeks	8 weeks and at least 16 weeks after first dose. Minimum age for the final dose is 24 weeks.
Rotavirus2	6 weeks	4 weeks	4 weeks2
Diphtheria, tetanus, & acellular pertussis3	6 weeks	4 weeks	4 weeks	6 months	6 months3
Haemophilus influenzae type b4	6 weeks	4 weeks if first dose was administered before the 1st birthday. 8 weeks (as final dose) if first dose was administered at age 12 through 14 months No further doses needed if first dose was administered at age 15 months or older	4 weeks4 if current age is younger than 12 months and first dose was administered at younger than age 7 months, and at least 1 previous dose was PRP-T (ActHib, Pentacel, Hiberix) or unknown. 8 weeks and age 12 through 59 months (as final dose)4 if current age is younger than 12 months and first dose was administered at age 7 through 11 months; OR if current age is 12 through 59 months and first dose was administered before the 1st birthday, and second dose administered at younger than 15 months; OR if both doses were PRP-OMP (PedvaxHIB; Comvax) and were administered before the 1st birthday. No further doses needed if previous dose was administered at age 15 months or older.	8 weeks (as final dose) This dose only necessary for children age 12 through 59 months who received 3 doses before the 1st birthday.
Pneumococcal5	6 weeks	4 weeks if first dose administered before the 1st birthday. 8 weeks (as final dose for healthy children) if first dose was administered at the 1st birthday or after. No further doses needed for healthy children if first dose administered at age 24 months or older.	4 weeks if current age is younger than 12 months and previous dose given at < 7 months old. 8 weeks (as final dose for healthy children) if previous dose given between 7-11 months (wait until at least 12 months old); OR if current age is 12 months or older and at least 1 dose was given before age 12 months. No further doses needed for healthy children if previous dose administered at age 24 months or older.	8 weeks (as final dose) This dose only necessary for children aged 12 through 59 months who received 3 doses before age 12 months or for children at high risk who received 3 doses at any age.
Inactivated poliovirus6	6 weeks	4 weeks6	4 weeks6	6 months6 (minimum age 4 years for final dose).
Measles, mumps, rubella8	12 months	4 weeks
Varicella9	12 months	3 months
Hepatitis A10	12 months	6 months
Meningococcal11 (Hib-MenCY ≥6 weeks; (MenACWY-D ≥9 mos; MenACWY-CRM ≥ 2 mos)	6 weeks	8 weeks11	See footnote 11	See footnote 11

Note: The above recommendations must be read along with the footnotes of this schedule.

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Children and adolescents age 7 through 18 years

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
Meningococcal11 (MenACWY-D ≥9 mos; MenACWY-CRM ≥ 2 mos)	N/A	8 weeks11