A member asked:

My 3 mth old baby had to get his hepatitis b; polio; dtap shots over again, why?

A doctor has provided 1 answer

Building immunity: The infant has a weak immune memory, leaving the protection from single vaccines to a duration of months rather than years unless they receive booster doses. After the boosters are given, and the kid gets older, the protection can last years.Even then, some will require boosting (tetanus) well into old age to maintain a protective level.

Answered 12/27/2013

4.6k views

Thank

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