Characterization of field strains of infectious laryngotracheitis virus in China by restriction fragment length polymorphism and sequence analysis

文献类型： 外文期刊

第一作者： Yan, Zhuanqiang

作者： Yan, Zhuanqiang;Li, Shengpeng;Xie, Qingmei;Chen, Feng;Bi, Yingzuo;Xie, Qingmei;Chen, Feng

作者机构：

关键词： China;epidemiology;infectious laryngotracheitis virus;isolation;sequence analysis

期刊名称：JOURNAL OF VETERINARY DIAGNOSTIC INVESTIGATION （ 影响因子：1.279； 五年影响因子：1.522 ）

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收录情况： SCI

摘要： Nineteen strains of infectious laryngotracheitis virus (ILTV; Gallid herpesvirus 1) were isolated from dead or diseased birds in chicken flocks from different areas of China between 2010 and 2014 and used to investigate ILTV epidemiology. These strains were characterized using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) patterns and sequence analysis of the thymidine kinase (TK) gene. PCR-RFLP analysis showed that the TK gene generated 2 patterns when digested with restriction endonuclease enzymes. Pattern A corresponded to 2 virulent field strains, while pattern B was characteristic of 2 virulent field strains, 15 low pathogenicity field strains, and all vaccine strains. Sequence analysis of the TK gene indicated that the messenger RNA polyadenylation signals could be identified in some isolates where amino acid 252 was threonine, and in those with methionine at that position. The present study has demonstrated that most of the outbreaks of ILT in China were caused either by low virulence strains or by vaccine-related strains, and also emphasizes the importance of reinforcing ILTV surveillance in both vaccinated and nonvaccinated flocks.

分类号： S85

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