A member asked:

How long after getting the h1n1 vaccine are you still immune to it?

A doctor has provided 1 answer

More complicated : There are many strains of h1n1 and each season those strains change. This means that even if you get the immunization one year, you will still need one the next season to help protect against that new, different and unique strain.

Answered 9/28/2016

5.7k views

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