A novel low virulent respiratory infectious bronchitis virus originating from the recombination of QX, TW and 4/91 genotype strains in China.
Vet Microbiol
; 242: 108579, 2020 Mar.
Article
in English
| MEDLINE | ID: covidwho-826358
ABSTRACT
In China, variants of infectious bronchitis virus (IBV) evolve continually and diverse recombinant strains have been reported. Here, an IBV strain, designated as ck/CH/LJX/2017/07 (referred as JX17) was isolated from chicken vaccinated with H120 and 4/91 in Jiangxi, China, in 2017. Sequence analysis reveals of the S1 gene of JX17 the highest nucleotide identity of 98.15% with that of GI-7 genotype TW2575/98 strain. Furthermore, whole genome analysis among JX17 and other 18 IBV strains demonstrates that JX17 has the highest nucleotide identity of 95.94% with GI-19 genotype YX10 strain. Among all genes of JX17 except the S1 gene, the N gene and 3' UTR have the highest identity to GI-13 genotype 4/91 strain and the rest genes are the most identical to GI-19 genotype YX10 strain. Analyzed by the RDP and SimPlot, the recombination of JX17 strain was shown to occur in regions which include 5'-terminal S1 gene (20,344 to 22,447 nt), most N gene and 3' UTR (26,163 to 27,648 nt). The pathogenicity study shows that JX17 is a natural low virulent IBV variant which caused respiratory symptoms but no death. Taken together, these results indicate that IBV strains continue to evolve through genetic recombination and three prevalent genotypes in China including QX, TW and 4/91 have started to recombine.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Recombination, Genetic
/
Reassortant Viruses
/
Genome, Viral
/
Coronavirus Infections
/
Infectious bronchitis virus
Type of study:
Randomized controlled trials
Topics:
Vaccines
/
Variants
Limits:
Animals
Country/Region as subject:
Asia
Language:
English
Journal:
Vet Microbiol
Year:
2020
Document Type:
Article
Affiliation country:
J.vetmic.2020.108579
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