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Types, Transmission
Types of Bird Flu (Avian Flu)
There are many different subtypes of type A influenza viruses. These subtypes differ because of certain proteins on the surface of the virus (hemagglutinin [HA] and neuraminidase [NA] proteins). Each different combination of HA and NA proteins is a different subtype of the virus. Infection with certain avian influenza A viruses (e.g., some H5 and H7 strains) can cause widespread disease and death among some species of domestic birds. Since 1997, more than 16 ...Read the full article 
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