title: Genetic diversity of avian infectious bronchitis coronavirus in recent years in China.
abstract: Fifty-six isolates of avian infectious bronchitis virus (IBV) were obtained from different field outbreaks in China in 2010, and they were genotyped by comparison with 19 reference strains in the present study. The results showed that LX4-type isolates are still the predominant IBVs circulating in chicken flocks in China, and these isolates could be grouped further into two clusters. Viruses in each cluster had favored amino acid residues at different positions in the S1 subunit of the spike protein. In addition, a recombination event was observed to have occurred between LX4- and tl/CH/LDT3/03I-type strains, which contributed to the emergence of a new strain. The most important finding of the study is the isolation and identification of Taiwan II-type (TW II-type) strains of IBV in mainland China in recent years. The genome of TW II-type IBV strains isolated in mainland China has experienced mutations and deletions, as demonstrated by comparison of the entire genome sequence with those of IBV strains isolated in Taiwan. Pathogenicity testing and sequence analysis of the 3' terminal untranslated region revealed that TW II-type IBV strains isolated in mainland China have a close relationship with the embryo-passaged, attenuated TW2296/95.
authors.affiliation: Division of Avian Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, People's Republic of China.
authors.forename: Huijie
authors.initials: H
authors.lastname: Ma
authors.forename: Yuhao
authors.initials: Y
authors.lastname: Shao
authors.forename: Chuyang
authors.initials: C
authors.lastname: Sun
authors.forename: Zongxi
authors.initials: Z
authors.lastname: Han
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Liu
authors.forename: Hongbo
authors.initials: H
authors.lastname: Guo
authors.forename: Xiaozhen
authors.initials: X
authors.lastname: Liu
authors.forename: Xiangang
authors.initials: X
authors.lastname: Kong
authors.forename: Shengwang
authors.initials: S
authors.lastname: Liu
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D002642:Chick Embryo; D002645:Chickens; D002681:China; D003001:Cloning, Molecular; D018352:Coronavirus Infections / Q000662:veterinary* / Q000821:virology; D005260:Female; D014644:Genetic Variation; D005838:Genotype; D001351:Infectious bronchitis virus / Q000737:chemistry / Q000145:classification* / Q000235:genetics* / Q000472:pathogenicity; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics*; D008969:Molecular Sequence Data; D010802:Phylogeny; D011201:Poultry Diseases / Q000821:virology*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D020539:Sequence Analysis, Protein; D064370:Spike Glycoprotein, Coronavirus; D014759:Viral Envelope Proteins / Q000235:genetics*; D014774:Virulence
chemical_list: D000914:Antibodies, Viral; D008562:Membrane Glycoproteins; D064370:Spike Glycoprotein, Coronavirus; D014759:Viral Envelope Proteins