Key result
Analysis of the S1 gene sequences from 10 IBV strains isolated in Jeonbuk showed 95.4% to 96.5% nucleotide homology with QX strains, indicating that QX-like IBVs are circulating in commercial chicken farms.
Observational (n=10)
QX-like infectious bronchitis viruses are circulating in commercial chicken farms in Jeonbuk, highlighting the need for continued surveillance.
Supports continued IBV surveillance in Jeonbuk poultry; leaves open optimal strain-specific control strategies.
Infectious bronchitis virus (IBV) causes an acute and highly contagious viral disease of chicken that is great economic losses to the poultry industry worldwide. Among the IBV structural proteins, the high rate spike glycoprotein S1 gene mutation and antigenic variant strains have been reported in many countries. During the years 2012~2014, 10 IBV strains were isolated from infected chicken farms distributed in provinces of Jeonbuk. Analysis of the S1 gene sequences amplified from 10 isolated strains with QX strains showed nucleotide homologies ranging from 96.5 to 95.4%. Phylogenetic analysis revealed that all strains were clustered into QX-like groups. This study suggests that QX-like IBVs are circulating in commercial chicken farms in Jeonbuk. Therefore, the continuing survellance is significantly important for prevention and control of BIV infection.
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Chu et al. (2015) conducted an observational in Infectious bronchitis virus (IBV) infection in chickens (n=10). IBV S1 gene sequencing and phylogenetic analysis was evaluated on Nucleotide homology and phylogenetic clustering of S1 gene. Analysis of the S1 gene sequences from 10 IBV strains isolated in Jeonbuk showed 95.4% to 96.5% nucleotide homology with QX strains, indicating that QX-like IBVs are circulating in commercial chicken farms.
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