ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (9): 1606-1612.doi: 10.11843/j.issn.0366-6964.2015.09.016

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Research on Pathogenicity of SPF Chicken Infected with a Class Ⅰ NDV Isolated from Waterfowl

YANG Shao-hua,XU Chuan-tian,HUANG Yan-yan,ZHANG Lin,HUANG Qing-hua,HU Bei-xia,ZHU Man-ling,ZHANG Xiu-mei*   

  1. (Shandong Key Lab of Animal Disease Control and Breeding,Institute of Animal Science and Veterinary Medicine,Shandong Academy of Agricultural Sciences,Jinan 250100,China)
  • Received:2014-12-06 Online:2015-09-23 Published:2015-09-23

Abstract:

A lentogenic Newcastle disease virus (NDV),SD22/13,was isolated from heron.The biology and pathogenicity were characterized in order to understand the evolution of NDV better.F gene of SD22/13 was sequenced and compared with that of reference strains.The antigenicity of the virus was compared with that of LaSota and other genotype Ⅶ virulent NDV strains via cross hemagglutination inhibition (HI).The pathogenicity of SD22/13 to SPF chicken was also conducted.The results indicated that SD22/13 was classified as a class Ⅰ genotype 3 NDV based on a partial sequence of the F gene.The antigenicity correlation between SD22/13 and LaSota was 56.1%,and the correlation of which with genotype Ⅶ NDV strains was less than 50%.Experiments on animals demonstrate that the isolate SD22/13 can replicate well in SPF chicken and induce a high immune antibody and had slight pathogenic to immune organ and kidney.Chickens inoculated with SD22/13 were challenged with genotype Ⅶ virulence NDV strain on 30dpi,and there had no death in chickens infected with SD22/13.The results demonstrated that SD22/13 stain had significant differences with genotypeⅦ NDV in biological characterization and pathogenic to chickens.Although the antigenic correlation was low between SD22/13 and genotype Ⅶ NDV,class I viruses can provide 100% protection rate,but it cannot block virus shedding upon challenge with genotypeⅦ virulent NDV.

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