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7 / 13  What is the reason that you have to be immunized with a new influenza vaccine each year?
A  the vaccine is only protective for a year
B  mutation
C  macrophage oxidative metabolism
D  memory response

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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