文献类型: 外文期刊
作者: Zhao, WJ; Gao, MY; Xu, QQ; Xu, Y; Zhao, Y; Chen, YQ; Zhang, TT; Wang, QL; Han, ZX; Li, HX; Chen, LF; Liang, SL; Shao, YH; Liu, SW
作者机构:
关键词: Infectious bronchitis virus (IBV); LX4 genotype (QX-like); Evolution; Topology; Clade I; Clade II
期刊名称: VETERINARY MICROBIOLOGY
ISSN: 0378-1135
年卷期: 2017 年 198 卷
页码:
收录情况: JCR(2021版)
摘要: We investigated the genomic characteristics of 110 LX4 genotype strains of infectious bronchitis viruses (IBVs) isolated between 1995 and 2005 in China. The genome of these IBVs varies in size from 27596 bp to 27790 bp. Most IBV strains have the typical genomic organization of other gamacoronaviruses, however, two strains lacked 3a and 5b genes as a result of a nucleotide change within the start codon in the 3a or 5b genes. Analysis of our 110 viruses revealed that recombination events may be responsible for the emergence of the LX4 genotype with different topologies. Most of these viruses disappeared (before mid 2005) because they were not "fit" to adaptation in chickens. Finally, those of the "fit" viruses (after mid 2005) continued to evolve and have become widespread and predominant in commercial poultry. In addition, few of these viruses experienced recombination with those of the vaccine strains at the 3' end of the genome. (C) 2016 Elsevier B.V. All rights reserved.
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