Influenza A virus subtype H7N9 (A/H7N9) is a bird flu strain of the species Influenza virus A Avian influenza A H7 viruses normally circulate amongst avian ...

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There are 16 subtypes of HA and 9 subtypes of NA known, but only H 1, 2 and 3, and N 1 and 2 are commonly found in humans. The central core of a virion ...

  en.wikipedia.org

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