Hepatitis A: Even though, according to the CDC (see link below if you would like to read more), repeating the dose series is not harmful, once you have been fully immunized, you should not need to repeat the immunization series. The vaccine has been reported to be very effective following the two dose series, however, no vaccine is 100% effective http://www.cdc.gov/hepatitis/A/aFAQ.htm
Answered 1/10/2015
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