A Primary Reason For Needing A New Vaccine For Influenza Each Year Is That _____.

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A Primary Reason For Needing A New Vaccine For Influenza Each Year Is That _____.

the first infection with influenza weakens the immune system mutation in the influenza virus is frequent influenza is a disease that causes the apoptosis of all memory cells immunity typically disappears one month after recovery from a disease the influenza virus might proliferate in different tissues during each subsequent year, and immune memory is limited to those tissues initially infected
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mutation in the influenza virus is frequent
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