Avian Influenza, Newcastle Disease, and Other Paramyxoviruses

Abstract

Infections with avian influenza A viruses and Newcastle disease virus (NDV) are considered together here because of the similarities between the two diseases. Both viruses occur commonly in wild waterfowl; are hemagglutinating and are isolated by the same techniques, so that isolants must be differentiated; have a broad avian host range and are important pathogens of domestic poultry; and occur in a continuum from inapparent infection to acute fatal disease.