More than 30 years: The CP vaccine we use today was developed in japan in the late 70's & reviewed by our fda for ~ 16 years before they decided the cost of general use offset the cost of deaths/hospital care & work loss in the us. It had been available for limited use thru the cdc for cancer patients during its review.It was approved in 1995 & adoped by may states thereafter.
Answered 5/12/2015
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