Author, Donkey, Bureaucrats, Administrators
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**Vaccination favors the evolution of the virus, which might increase its virulence and drift
**Vaccination favors the evolution of the virus, which might increase its virulence and drift
[[Category:Orthomyxoviridae]][[Category:Poultry]]
[[Category:Orthomyxoviridae]][[Category:Poultry]]
[[Category:To_Do_-_Viruses]]