What adaptive changes in hemagglutinin and neuraminidase are necessary for emergence of pandemic influenza virus from its avian precursor?

Abstract excerpt

Wild ducks serve as the primary host for numerous and various influenza type A viruses. Occasionally, viruses from this reservoir can be transferred to other host species and cause outbreaks of influenza in fowl, swine, and horses, as well as result in novel human pandemics. Cellular tropism and range of susceptible host species are determined by interaction between virus and receptor molecules on cells. Here we...

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