Question 23 / 34:  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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Anatomy & Physiology 21 Lymphatic & Immune Sys.

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Attribution:  OpenStax College. Anatomy & Physiology, OpenStax-CNX Web site. http://cnx.org/content/col11496/1.6/, Jun 11, 2014
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