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What is avian influenza? PDF Print E-mail
Sunday, 15 June 2008

Avian influenza (AI) is a disease of poultry (both chickens and turkeys) caused by a type A virus belonging to the Orthomyxovirus
group. The different types of avian influenza viruses are described and differentiated by the types of hemagglutinin (H) and
neuraminidase (N) glycoproteins (surface antigens) on the outer surface of the virus. There are a total of 15 hemagglutinin and
9 neuraminidase types. An AI virus can start out by being of low pathogenicity (LPAI) but mutate without warning to
become of high pathogenicity (HPAI) without a change in its H or N subtypes.

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