Fresh poultry meat market, an environment suitable for virus interspecies transmission and reassort-ment of the bird flu virus, duck.And quail can act as mixing vessels in order to facilitate its viral reassortment of Enza-dominated a different subtype, which can result in the production of a bird flu virus reassortant novels and the selection of mutations that could expand the range of their host mammals. nH 7 N 9 deletion of five amino acids in the NA rods may be related to a virus, raised by virulence.Influenza NA stick for a long time has the advantage in qualifying in a selective advantage in water birds, aquatic birds.
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