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How Long Is The Hepatitis A Shot Good For?

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    After the first shot, protection is about 30-55 per cent, which is why a 2nd, 3rd and sometimes a 4th "booster" shot are required.  When fully protected, it is said to last up to 20 years.  However, research data shows that not all people reach full protection, and some people who have been fully inoculated still get Hep-A.

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    Drsmartphd 

    answered 5 months ago

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