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Dr. Sakina Tapia MD, FAAP
Recommended childhood and adolescent immunization schedule
For more detailed information about immunization please click here.
For Children and Adolescents Who Start Late or Who Are >1 Month Behind
The tables below give catch-up schedules and minimum intervals between doses for children who have delayed immunizations. There is no need to restart a vaccine series regardless of the time that has elapsed between doses. Use the chart appropriate for the child’s age.
Catch-up schedule for children age 4 months through 6 years Minimum Interval Between Doses 

1. DTaP: The fifth dose is not necessary if the fourth dose was given after the fourth birthday.
2. IPV: For children who received an all-IPV or all-oral poliovirus (OPV) series, a fourth dose is not necessary if third dose was given at age >4 years. If both OPV and IPV were given as part of a series, a total of 4 doses should be given, regardless of the child’s current age.
3. HepB: All children and adolescents who have not been immunized against hepatitis B should begin the HepB immunization series during any visit. Providers should make special efforts to immunize children who were born in, or whose parents were born in, areas of the world where hepatitis B virus infection is moderately or highly endemic.
4. MMR: The second dose of MMR is recommended routinely at age 4 to 6 years but may be given earlier if desired.
5. Hib: Vaccine is not generally recommended for children age >5 years.
6. Hib: If current age <12 months and the first 2 doses were PRP-OMP (PedvaxHIB or ComVax [Merck]), the third (and final) dose should be given at age 12 to 15 months and at least 8 weeks after the second dose.
7. PCV: Vaccine is not generally recommended for children age >5 years.
8. Td: For children age 7 to 10 years, the interval between the third and booster dose is determined by the age when the first dose was given. For adolescents age 11 to 18 years, the interval is determined by the age when the third dose was given.
9. IPV: Vaccine is not generally recommended for persons age >18 years.
10. Varicella: Give 2-dose series to all susceptible adolescents age >13 years