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If that changes with a mutation or a recombination or reassortment of one virus to the other, that could change everything.
Of the ones they examined, they don't see any reassortment with human viruses yet.
No evidence of genetic reassortment between avian and human influenza viruses has been identified.
With the 1968 influenza virus, a similar reassortment of genes occurred.
reassortment also might occur in a person simultaneously infected by both types of flu
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