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A member asked:
For what reasons do we need 3 does of certain vaccinations like hepatitis b?
A doctor has provided 1 answer
Building immunity: Vaccine developers will routinely check the effect of single vs several dose programs to see what is needed to provide long term protection. If one dose works but fades after months & 3 will give you many years of protection, the 3 dose program will be the one adopted.
Answered 5/28/2013
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