Bird Flu: An Emerging Threat to Human and Animal Health
Avian influenza or "bird flu" is caused by influenza viruses that occur naturally among wild aquatic birds worldwide and can infect domestic poultry and other bird and animal species. The H5N1 strain first known to affect poultry started in southeast Asia in the 1990s. By 2003, the virus had spread throughout many Asian and European countries as well as some African nations, carried through migratory wild bird routes as well as trade in domestic poultry. Though controlled in some areas, outbreaks continue to threaten poultry farms and potentially human health
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