畜牧兽医学报 ›› 2015, Vol. 46 ›› Issue (9): 1606-1612.doi: 10.11843/j.issn.0366-6964.2015.09.016

• 预防兽医 • 上一篇    下一篇

野生水禽源ClassⅠ新城疫病毒对SPF鸡的致病性研究

杨少华,许传田,黄艳艳,张琳,黄庆华,胡北侠,朱曼玲,张秀美*   

  1. (山东省农业科学院畜牧兽医研究所 山东省畜禽疫病防治与繁育重点实验室,济南 250100)
  • 收稿日期:2014-12-06 出版日期:2015-09-23 发布日期:2015-09-22
  • 通讯作者: 张秀美(1956-),女,江苏徐州人,研究员,主要从事禽病综合防控技术研究,E-mail:zxm820410@163.com
  • 作者简介:杨少华(1978-),女,山东烟台人,硕士,助理研究员,主要从事禽病综合防控技术研究,Tel:0531-88622611,E-mail:ysh7865@163.com
  • 基金资助:

    公益性行业(农业)科研专项(201003012;201303033);现代农业产业技术体系建设专项资金(CARS-42-Z12)

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:2015-09-22

摘要:

为了科学地了解新城疫病毒(NDV)的遗传进化规律,本研究对从鹭科候鸟分离的NDV毒株 SD22/13的生物学特性和致病特性进行了研究。通过致病性指数测定和交叉血凝抑制试验测定分离株SD22/13的毒力及与LaSota疫苗株、基因Ⅶ型NDV毒株的抗原相关性,同时设计引物对F基因进行克隆测序和遗传进化分析,并对其在SPF鸡上的致病性进行评价。生物学特性和遗传进化分析显示SD22/13属于ClassⅠ分支基因3型,与LaSota疫苗株的抗原相关性为56.1%,与基因Ⅶ型强毒株的抗原相关性低于50%。致病性试验结果表明该毒株可在鸡体内较好复制,并刺激机体产生较高水平血清抗体,鸡的免疫器官和肾虽均有轻微的病理损伤,但无发病死亡,对试验鸡致病性较低;SD22/13感染后30 d,再以基因Ⅶ型强毒株攻毒,在10 d观察期内SD22/13感染组鸡均健康,无发病死亡,而对照组鸡至第5天时全部死亡。本研究结果表明分离株SD22/13在生物学特性、抗原性和对SPF鸡致病性方面与基因Ⅶ型NDV存在明显差异;虽然SD22/13与基因Ⅶ强毒株抗原相关性较低,不能阻止其排毒,却能完全保护鸡抵抗强毒株的攻击。

关键词: 新城疫病毒, 野生水禽, 致病性

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.

Key words: Newcastle disease virus, wild waterfowl, pathogenicity

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