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Introduction
Page 3 of 75

Avian influenza and Newcastle disease are economically important poultry diseases that share many similarities.

Both diseases are caused by groups of viruses that vary from mildly pathogenic to highly virulent. Milder forms of Newcastle disease and avian influenza are present in the United States. The severe forms of each disease are exotic and must be reported immediately to State and Federal authorities.The severe forms of each disease can have serious consequences for international trade.