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Bird flu is a viral disease that occurs in birds throughout the world. While the disease has a broad distribution, to date it is rarely transmitted to people.

The greatest risk factor for bird flu infection is close contact with domesticated birds in areas where the virus is present (primarily Southeast Asia). Birds spread the virus through their secretions and feces and may contaminate cages, feed and the ground. Most forms of contact with live birds occur through farming or within markets. In addition, humans can also be infected by exposure to bird feathers and droppings. Limited reports of human infection have been associated with eating wild birds or their parts.