Prevalence of antibodies to different avian paramyxoviruses in commercial poultry in the United States.

Avian paramyxoviruses (APMVs) other than Newcastle disease virus have been isolated from feral avian species and have the potential to cause clinical disease. The objective of this study was to investigate the APMV antibody prevalence in commercial poultry settings. Sera from 100 commercial, layer-type and broiler-type (broiler-breeder and broiler) chicken flocks were analyzed on a random basis.

Comparative study on the pathogenicity and immunogenicity of wild bird isolates of avian paramyxovirus 2, 4, and 6 in chickens.

Based on the haemagglutination inhibition assay, nine antigenically distinct serotypes of avian paramyxoviruses (APMV) are described. Isolates from APMV 2, 3, 6 and 7 can cause respiratory symptoms and/or problems of the reproductive tract that may produce complications if secondary infections occur, while isolates from APMV 4, 5, 8 and 9 rarely produce clinical signs in species from which they are isolated. Isolates belonging to the APMV 1 subtype induce a wide range of disease symptoms varying from mild symptoms to a disease with devastating consequences as caused by velogenic Newcastle disease virus.