de Wit J J, Cazaban C, Dijkman R, Ramon G, Gardin Y
a GD Animal Health , Deventer , the Netherlands.
b Ceva Santé Animale , Libourne , France.
Avian Pathol. 2018 Apr;47(2):140-151. doi: 10.1080/03079457.2017.1387231. Epub 2017 Oct 24.
To gather recent data regarding the infectious bronchitis (IB) and infectious bursal disease (IBD) situation in Europe, a large-scale field epidemiological survey using diagnostic samples has been implemented in 2013 for about six months in several European countries: France, Germany, Greece, Italy, the Netherlands, Poland, Portugal, the Republic of Ireland, Spain and the UK. In 234 flocks that were sampled, strains from 10 different IBV genotypes were detected: the 793B genotype was detected most frequently, followed by QX, Massachusetts (Mass) and the Xindadi-like strains. Strains belonging to the Q1, Ark, D274, D1466, Italy-02 and B1648 genotypes were detected as well, although less frequently. The separate sampling of tracheas and kidneys for IBV detection using reverse transcriptase PCR was very useful, as different genotypes or significant differences in sequences of the same genotype were detected between both organs. The data of this survey also provided valuable information about the replication of IBD vaccines and subsequent infectious bursal disease virus (IBDV) antibody responses under field conditions. The detection of five non-vvIBDV field strains of two different genotypes shows the presence of non-vvIBDV non-vaccine strains, which can easily be undetected in Europe due to the focus on sampling of clinically ill birds. Detection of vaccine virus in the bursa and antibody response to the IBD vaccination in flocks that had been vaccinated by the drinking water with a live attenuated vaccine compared to a vaccination in the hatchery using an immune-complex vaccine showed a delayed replication of the vaccines that had been applied by the drinking water, indicating mistakes in the timing and/or application of the vaccines.
为收集有关欧洲传染性支气管炎(IB)和传染性法氏囊病(IBD)情况的最新数据,2013年在欧洲多个国家(法国、德国、希腊、意大利、荷兰、波兰、葡萄牙、爱尔兰共和国、西班牙和英国)开展了一项为期约六个月的大规模现场流行病学调查,采用诊断样本进行研究。在采样的234个鸡群中,检测到来自10种不同传染性支气管炎病毒(IBV)基因型的毒株:793B基因型检测频率最高,其次是QX、马萨诸塞州(Mass)和新大迪样毒株。也检测到了属于Q1、阿肯色州(Ark)、D274、D1466、意大利-02和B1648基因型的毒株,不过频率较低。使用逆转录聚合酶链反应(RT-PCR)分别采集气管和肾脏样本用于检测IBV非常有用,因为在两个器官之间检测到了不同的基因型或同一基因型序列的显著差异。这项调查的数据还提供了有关IBD疫苗在现场条件下的复制情况以及随后传染性法氏囊病病毒(IBDV)抗体反应的宝贵信息。两种不同基因型的五种非超强毒IBDV现场毒株的检测表明存在非超强毒IBDV非疫苗毒株,由于重点对临床患病鸡进行采样,这些毒株在欧洲很容易被漏检。与在孵化场使用免疫复合物疫苗进行接种相比,对通过饮水接种活减毒疫苗的鸡群中法氏囊中疫苗病毒的检测以及对IBD疫苗接种的抗体反应表明,通过饮水接种的疫苗复制延迟,这表明疫苗接种时间和/或接种方式存在错误。
Vaccines (Basel). 2023-8-2