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Molecular Prevalence Study of QX-like Infectious Bronchitis Virus in Japan from 2016 to 2023.
Avian Dis
September 2023
JA Zen-noh (National Federation of Agricultural Co-operative Associations) Institute of Animal Health, Sakura, Chiba 285-0043, Japan.
Infectious bronchitis is an acute and highly contagious disease in chickens caused by the infectious bronchitis virus (IBV), which has caused significant economic losses to the poultry industry worldwide. The antigenic variant, the QX-like genotype (GI-19 lineage), has been currently reported in epidemics in East Asia, Southeast Asia, the Middle East, Europe, and Africa. We first reported an epidemic of Japanese QX-like IBVs genetically related to Chinese and South Korean strains in the Kyushu region of Japan in 2020.
View Article and Find Full Text PDFA novel highly virulent nephropathogenic QX-like infectious bronchitis virus originating from recombination of GI-13 and GI-19 genotype strains in China.
Poult Sci
August 2024
College of Animal Science and Technology, Guangxi University, Nanning 530004, PR China; Guangxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Nanning 530004, PR China; Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Nanning 530004, PR China. Electronic address:
Article Synopsis
- Infectious bronchitis virus (IBV) significantly impacts poultry, causing respiratory and reproductive issues, and the study identifies a new strain, CK/CH/GX/LA/071423, isolated from vaccinated chickens.
- Genetic analysis shows this strain shares 96.7% similarity with the YX10 strain of the GI-19 genotype, with indications it resulted from recombination between YX10 and 4/91 vaccine strains.
- Pathogenicity tests reveal that CK/CH/GX/LA/071423 is nephropathogenic, causing serious kidney damage and raising concerns about how well existing vaccines protect against evolving IBV strains.
Evaluation of the efficacy of commercial live vaccines against the local Thai QX field strain for the protection of specific pathogen-free chicks.
Vet World
April 2024
Avian Health Research Unit, Department of Veterinary Medicine, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand.
Background And Aim: The high prevalence of QX-like variant among Thai isolates poses a significant threat to poultry production. In this study, we evaluated the protective efficacy of commercially available heterologous infectious bronchitis virus (IBV) vaccines against the local Thai QX-like strain in specific-pathogen-free (SPF) chicks from Thailand.
Materials And Methods: The experiment involved 100 SPF chicks divided into 4 arms.
Detection of multiple recombinations of avian coronavirus in South Korea by whole-genome analysis.
Infect Genet Evol
March 2024
College of Veterinary Medicine, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea. Electronic address:
Infectious bronchitis virus (IBV), an avian coronavirus, has caused considerable damage to the poultry industry. In Korea, indigenous KM91-like and newly introduced QX-like lineages belonging to the GI-19 lineage have been prevalent despite constant vaccination. In this study, complete genome sequences of 23 IBV isolates in Korea from 2010 to 2020 were obtained using next-generation sequencing, and their phylogenetic relationship and recombination events were analyzed.
View Article and Find Full Text PDFSingle-step multiplex reverse transcription-polymerase chain reaction for the detection and differentiation of QX-like infectious bronchitis virus from the Thai variant and vaccine strains H120, Ma5, and 4/91.
Vet World
May 2023
Division of Livestock Medicine, Faculty of Veterinary Medicine, Khon Kaen University, Khon Kaen 40002, Thailand.
Background And Aim: QX-like infectious bronchitis virus (IBV) is a highly infectious avian coronavirus that causes respiratory and kidney disease. It is linked to increased mortality and loss of performance in infected chickens worldwide, including Thailand. Thus, a simple and rapid diagnostic method for the diagnosis of QX-like IBV is needed.
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