Newcastle disease (ND) is a highly contagious disease of poultry caused by virulent avian paramyxovirus-1 (APMV-1) (previously termed avian avulavirus-1 and avian orthoavulavirus-1). APMV-1 is endemic in poultry in many developing countries, whilst outbreaks still occur in developed countries, affecting both commercial and backyard flocks. ND outbreaks can have substantial economic consequences due to high mortality rates and the imposition of trade restrictions. APMV-1 nucleic acid can be detected from swabs or tissues of suspected cases by PCR. Evidence of infection or vaccination may be demonstrated by the presence of specific antibodies against HN in serum samples. No anti-viral treatments exist, but vaccines are available, although there are currently concerns over their efficacy.
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