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Old 05-29-2012
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Virus Reassortment and Flu

Is viral reassortment the reason for why each year there is a different influenza vaccine or the reason for the swine flu epidemic?
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Old 05-30-2012
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Yep, orthomyxoviruses are segmented so can undergo reassortment and cause genetic shift, and therefore epidemics.
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Old 05-30-2012
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It's the reason for genetic shifts (substantial) and occasional flu 'pandemics' (to be precise.)
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