No: You do not need to get it again and Yes it is safe to have it twice in a year.
Answered 12/31/2016
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Depends: If you had the equivalent vaccines in childhood and have a normal immune system there is no reason to get it again.It works as a reminder to your immune system and boosts the immunity you developed in childhood, some of which may have declined .If you never got any before, a second dose would be reasonable,
Answered 1/2/2017
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