Key result
QX-like infectious bronchitis virus genes were detected in 16 of 104 commercial broiler farms in Japan, marking the first isolation of these strains in the country.
Why the study?
QX-like infectious bronchitis virus field strains were isolated to enable evaluation of commercial vaccine efficacy in future studies.
Observational (n=104)
The study successfully identified and isolated QX-like infectious bronchitis virus strains in Japan, which are highly homologous to strains in China and South Korea, enabling future vaccine efficacy evaluations.
S1 polymorphism distinguishes QX-like from JP-III IBV; leaves open utility for Kyushu farm surveillance.
The antigenic variant QX-like infectious bronchitis virus (IBV) is endemic in several countries. In Japan, the QX-like genotype is classified as the JP-III genotype based on the partial S1 gene and as the GI-19 genotype based on the complete S1 gene. This study showed that QX-like IBVs and JP-III IBVs can be identified based on the amino acid polymorphism of the S1 glycoprotein. Furthermore, genetic analysis of several IBV field strains detected in commercial broiler farms across the Kyushu area in 2020 revealed Japanese QX-like IBVs, which are highly homologous to the QX-like IBVs recently detected in China and South Korea. Herein, QX-like IBV field strains were isolated for evaluating commercial vaccine efficacy in our future studies.
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Nakanishi et al. (2022) conducted an observational in Infectious bronchitis virus (IBV) in chickens (n=104). QX-like infectious bronchitis virus (IBV) was evaluated on Detection of QX-like IBV genes in field samples. QX-like infectious bronchitis virus genes were detected in 16 of 104 commercial broiler farms in Japan, marking the first isolation of these strains in the country.
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