Jul 8, 2020 · The results revealed that QX-like IBV strain SD was severely pathogenic in chickens, causing respiratory, urinary and reproductive infections, irrespective of age, based on clinical observations, viral distribution in tissues and a ciliostasis study.

Jan 1, 2020 · Avian infectious bronchitis is a serious and highly contagious disease caused by infectious bronchitis virus (IBV). We isolated a highly virulent IBV strain (CK/CH/JS/TAHY) from kidneys of diseased chickens. Phylogenetic analysis based on the S1 gene revealed that CK/CH/JS/TAHY clustered with the QX-like type.

Dec 1, 2024 · Our data indicate antigenicity variances between QX isolates and QXL87 vaccine strains, potentially resulting in immune evasion occurrences. Overall, these results offer crucial insights into the epidemiology and pathogenicity of QX-type IBV, facilitating improved selection and formulation of vaccines for disease management.

Nov 24, 2023 · 从接种 h120 和 4/91 疫苗的鸡中分离到一株新型低毒力呼吸道 ibv ck/ch/ljx/2017/07（简称 jx17），并被证明是 qx、tw 和 4/91 基因型菌株的重组株。一种高毒力的 qx 样 ibv 菌株 ck/ch/js/tahy 显示出典型的临床症状，包括咳嗽、流鼻涕和伴有严重尿酸盐沉积的肾 …

QX-like genotype infectious bronchitis virus (IBV) has become prevalent in recent years. Few studies have reported the effects of accessory proteins 3a and 3b on pathogenicity in vivo. We developed a reverse genetics system to manipulate the genome of a QX-like IBV strain IBYZ.

The QX-type avian infectious bronchitis virus (IBV) is still a prevalent genotype in Southwestern China. To analyze the antigenicity and pathogenicity characteristics of the dominant genotype strains (QX-type), S1 gene sequence analysis, virus ...

Oct 15, 2019 · In this study, a pathogenic avian infectious bronchitis virus (IBV) QX-type strain YN was successfully rescued by vaccinia virus based reverse genetic technology. Ten fragments contiguously spanning the complete IBV genome were amplified and cloned into the vaccinia virus genome by homologous recomb …

Mar 25, 2025 · After approximately three decades of transmission and epidemic spread, the QX strain has established persistent distribution and prevalence in numerous countries and regions including China, Asia, Europe, and Africa; QX-like type as one of the most important IBV genotypes globally while inflicting substantial economic losses on the global ...

Currently, one of the most relevant genotypes circulating worldwide is IBV-QX (GI-19), for which vaccines have been developed by passaging virulent QX strains in embryonated chicken eggs. Here we explored the attenuated phenotype of a commercially available QX live vaccine, IB Primo QX, in specific pathogens free broilers.

Apr 7, 2022 · Our results indicate that the QX-type IBV is more pathogenic than Mass-type IBV to oviduct in laying phase. Collectively, these findings provide detailed information on the pathological changes in different segments of the oviduct in laying phase, which could offer a better understanding about the pathogenicity of IBV.