Table 2. Catch-up immunization schedule for persons aged 4 months–18 years who start late or who are more than 1 month behind, United States, 2020
The table below provides 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 this table in conjunction with Table 1 and the notes that follow.
| 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 B  |
Birth | 4 weeks | 8 weeks and at least 16 weeks after first dose. Minimum age for the final dose is 24 weeks. | ||
| Rotavirus |
6 weeks Maximum age for first dose is 14 weeks, 6 days. | 4 weeks | 4 weeks Maximum age for final dose is 8 months, 0 days. |
||
| Diphtheria, tetanus, and acellular pertussis |
6 weeks | 4 weeks | 4 weeks | 6 months | 6 months |
| Haemophilus influenzae type b |
6 weeks | No further doses needed if first dose was administered at age 15 months or older. 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 previous dose was administered at age 15 months or older. 4 weeks 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) 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. |
8 weeks (as final dose) This dose only necessary for children age 12 through 59 months who received 3 doses before the 1st birthday. |
|
| Pneumococcal conjugate |
6 weeks | No further doses needed for healthy children if first dose was administered at age 24 months or older. 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 previous 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. |
8 weeks (as final dose) This dose only necessary for children age 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 poliovirus |
6 weeks | 4 weeks | 4 weeks if current age is <4 years.
6 months (as final dose) if current age is 4 years or older. |
6 months (minimum age 4 years for final dose). | |
| Measles, mumps, rubella |
12 months | 4 weeks | |||
| Varicella |
12 months | 3 months | |||
| Hepatitis A |
12 months | 6 months | |||
| Meningococcal ACWY |
2 months MenACWY-CRM 9 months MenACWY-D |
8 weeks | See notes | See notes | |
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 |
|||
| Meningococcal ACWY |
Not Applicable (N/A) | 8 weeks | |||
| Tetanus, diphtheria; tetanus, diphtheria, and acellular pertussis |
7 years | 4 weeks | 4 weeks if first dose of DTaP/DT was administered before the 1st birthday. 6 months (as final dose) if first dose of DTaP/DT or Tdap/Td was administered at or after the 1st birthday. |
6 months if first dose of DTaP/DT was administered before the 1st birthday. | |
| Human papillomavirus |
9 years | Routine dosing intervals are recommended. | |||
| Hepatitis A |
N/A | 6 months | |||
| Hepatitis B |
N/A | 4 weeks | 8 weeks and at least 16 weeks after first dose. | ||
| Inactivated poliovirus |
N/A | 4 weeks | 6 months A fourth dose is not necessary if the third dose was administered at age 4 years or older and at least 6 months after the previous dose. |
A fourth dose of IPV is indicated if all previous doses were administered at <4 years or if the third dose was administered <6 months after the second dose. | |
| Measles, mumps, rubella |
N/A | 4 weeks | |||
| Varicella |
N/A | 3 months if younger than age 13 years. 4 weeks if age 13 years or older. |
|||