Can you tell me after taking the H1N1 vaccine, how long is it before you are immune to the virus?


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H1N1 Vaccine It takes the body at least a couple of days to build up immunity. Influenza A (H1N1) 2009 Monovalent Vaccine is an inactivated vaccine that cannot cause influenza but rather stimulates the immune system to produce antibodies. ChaCha again!

Answered by Robert S. -

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