1Hepatitis B vaccination scheduling can be flexible, and those not vaccinated in infancy may begin the series during any childhood visit. Those not immunized with the 3 doses should initiate or complete the series during the 11-12-year-old visit.                      

2Schedules for polio vaccination vary depending on the vaccine combination chosen.

3Number and periodicity of vaccinations may vary according to vaccine type.

4DTaP (diphtheria and pertussis toxoids and acellular pertussis) is the preferred vaccine for all doses. Whole cell DTP is an acceptible alternative.

5Children with a prior history of chickenpox do not need to be immunized. Children age 19 months to 12 years without a prior history of chiken pox should be vaccinated.

6Differences exist in recommendations for periodicity.

7Differences exist in age onset and periodicity.

8In communities at established "low risk" for lead poisoning, targeted screening may be appropriate.

9Testing for strabismus is recommended by most authorities before or at 3 to 4 years of age. Routine visual acuity testing remains controversial.

10Differences exist in age of onset and periodicity.

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