Avian influenza (bird flu) is caused by infection with avian influenza (flu) Type A viruses. These viruses routinely spread among wild aquatic birds worldwide and can infect domestic poultry and other bird and animal species. Sporadic human infections with bird flu viruses have occurred. Avian influenza A viruses are classified into the following two categories: Highly pathogenic avian influenza (HPAI) virus strains are extremely infectious, often fatal to chickens, and can spread rapidly from flock-to-flock. Low pathogenicity avian influenza (LPAI) virus strains occur naturally in wild migratory waterfowl and shorebirds without causing illness. LPAI can infect domestic poultry, creating little or
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