鸡传染性法氏囊病的临床诊治

鸡传染性法氏囊病是由传染性法氏囊病病毒引起的一种急性、高度接触性传染病。     

鸡传染性法氏囊病的防治

鸡传染性法氏囊病又称鸡传染性腔上囊病,是由传染性法氏囊病毒引起的一种急性、高度接触传染性疾病。     

鸡传染性法氏囊病毒检测方法研究进展

鸡传染性法氏囊病病毒(IBDV)属于双股双节RNA病毒科双股双节RNA病毒属,无囊膜,单层衣壳,二十面体对称,直径为55～60nm。IBDV分为2个血清型,血清工型对鸡有致病性,而血清Ⅱ型无致病性。IBDV主要侵害鸡的法氏囊等淋巴组织,破坏B淋     

原位PCR检测鸡传染性法氏囊病病毒

采取临床病例鸡的法氏囊制成石蜡切片,经蛋白酶K处理、原位RT-PCR后,用地高辛精标记探针进行原位杂交检测传染性氏囊病病毒（IBDV）。结果10个病例有8个呈阳性,2个阴性。本试验尝试利用具有极高灵敏度的原位PCR方法,从组织中检测低拷贝甚至单拷贝的目标序列,以鉴别隐性感染或混合感染,为IBDV的诊断和分子流行病学的分析提供了一种新的手段。     

传染性法氏囊病病毒主要结构蛋白研究进展

传染性法氏囊病病毒(Infectious bursal disease virus,IBDV)引起禽类的传染性法氏囊病(Infectious bursal disease,IBD),主要侵害免疫器官,直接引起感染鸡的发病或死亡,更重要的是能引起鸡的免疫抑制,导致对其他病原因子的易感性增强及对疫苗的免疫应答能力下降。近年来随着反向遗传等新技术的应用,对该病毒的基因组及编码蛋白研究有了长足的进步,本文对该病毒主要结构蛋白方面的研究进展进行了综述。     

鸡传染性法氏囊病病毒检测方法研究进展

对鸡传染性法氏囊病病毒检测方法研究进展进行了综述。     

鸡传染性法氏囊病的防治

鸡传染性法氏囊病又称鸡传染性腔上囊病,是由传染性法氏囊病毒引起的一种急性、接触传染性疾病。以突然发病、病程短、发病率高、法氏囊受损和鸡体免疫机能受抑制为特征。1临床症状病鸡精神不振,食欲下降或不食,羽毛松乱,无光泽,怕冷扎堆儿,伴有颤抖;腹泻,排出白色粘稠或水样稀便,泄殖腔周围的羽毛被粪便污染。2剖检变化头部、下额部的皮下组织水肿,似胶冻样,并有黄色液体浸润,眼结膜充血,眼睑水肿;胸部肌肉和腿部肌肉呈条纹状出血或斑点状出血,腺胃和肌胃交界处有出血带;心包炎,心包膜增厚,心包液增多,心冠脂肪有点状出血;肠粘膜充血、水肿…     

传染性法氏囊病的研究进展

本文综述了传染性法氏囊病病毒（IBDV）的分子结构与功能的关系。IBDV的抗原变异主要与病毒VP2蛋白的2个亲水区有关；分子流行病学调查结果显示，不同地区分离到超毒株与欧洲的超强毒株间有相似的来源，超强毒株赖以产生的分子基础尚不明确，且新的超强毒株不断出现。表达VP2基因的重组疫苗有一定的保护作用。     

鸡传染性法氏囊病的治疗体会

鸡传染性法氏囊病是由病毒引起的一种传染病.主要通过直接接触或经污染的水.饲料、垫料、尘埃以及饲养管理人员的鞋、衣等物品而经口、眼结膜及呼吸道传染.此病一年四季均可发生,发病率高,传染性快,是目前危害养鸡业的重要传染病之一.近几年来,我们对全镇84户养鸡大户饲养的发生此病的肉鸡进行治疗,鸡群死亡率大部分控制在3%-10%,现报告如下.     

鸡传染性法氏囊病新型疫苗的研究进展

鸡传染性法氏囊病(IBD)是由鸡传染性法氏囊病病毒(IBDV)引起的雏鸡的一种高度接触性传染病,自1962年报道以来,世界上主要养禽国家和地区均有流行,给养禽业带来严重经济损失。目前,IBD防控的主要方法是采用疫苗接种,使易感雏鸡获得主动或被动免疫保护,因此疫苗的质量对临床上IBD的防控起着至关重要的作用。虽然各国均有较好的商品化疫苗,但随着IBDV毒株的不断变异,商品化疫苗的抗原性与流行毒株不能完全匹配,临床上免疫失败时有发生,因此迫切需要研发与临床流行毒株相匹配的新型疫苗用于IBD的防控。对近期IBD的基因缺失苗、亚单位疫苗、DNA疫苗以及活载体疫苗等新型疫苗的研究进展进行概述,以此为IBD新型疫苗的研究提供参考。     

鸡传染性法氏囊病病毒的快速检测

随着 IBDV变异株的出现 ,发病鸡常不产生法氏囊的肉眼病变 ,由于传染性和非传染性因素亦可引起淋巴细胞减少和法氏囊坏死 ,所以 ,采取组织病理学方法诊断 IBDV感染并不完全可靠。由于主动性抗体应答需要一定的时间及大多数雏鸡都带有母源抗体 ,因此血清学早期诊断也不完全可靠。该试验采用本所研究的 IBD快速试纸与经典的琼扩试验 ,在对 IBDV的检测效果上进行了详细的比较 ,介绍如下。1　材料与方法1 .1　 IBD快速检测试纸　由河南省农业科学院生物技术研究所制备提供。1 .2　试验鸡　 1日龄试验鸡 30 0只由河南农业大学试验鸡场提…     

鸡传染性法氏囊病病毒实时荧光定量RT—PCR检测方法的建立

本试验根据GenBank中鸡传染性法氏囊病病毒(IBDV)基因组设计一对针对病毒vp5基因的引物和一条特异性Taq Man探针,建立了一种快速检测IBDV核酸载量的Taq Man荧光定量RT-PCR方法.通过对反应条件和反应体系的优化,使得该方法在108拷贝/μL～101拷贝/μL范围内具有良好的线性关系.能够灵敏地检测初始模板中30个拷贝的病毒核酸,其灵敏度是常规RT-PCR检测方法的100倍.该方法不与其它的禽源病毒发生非特异性反应,并且具有良好的重复性,为IBDV的定性定量检测提供了有效的工具.     

Double-antibody sandwich ELISA for detection of infectious bursal disease virus.

A double-antibody sandwich ELISA was employed for detection of IBD virus in bursal suspension. Fifty IBD-free white leghorn chickens aged 5 weeks were experimentally infected with IBD virus. Bursae were collected 4, 8, 12, 24, 36 and 48 hours and 3, 4 and 5 days post-infection. An equal number of chickens acted as appropriate controls. The colour difference between a positive and a negative reaction was clearly distinguished with the naked eye. The cut-off level between ELISA negative and ELISA positive absorbance values was estimated at mean absorbance of negative controls plus three times the standard deviation.     

Development of a disperse dye immunochromatographic test for the detection of antibodies against infectious bursal disease virus

For investigating the feasibility of using disperse dyes as an immunoassay chromogenic marker, a disperse dye, DADISPERSE NAVY BLUE SP, was selected in analyzing antibody against infectious bursal disease virus (anti-IBDV). With the color intensity revealed in the disperse dye immunochromatographic test (DICT) strip as the objective function, the optimal dyeing conditions were found as follows: dye concentration absorbance (at lambda(max)=587nm)=3, pH 7, 50 degrees C, for 10min. Under these conditions, the resultant dyed-antibody (rabbit anti-chicken) can produce an optimal color intensity reading of 55,054 on the strip. For performing qualitative immunoassay, chicken sera samples taken from different farms were used for the anti-IBDV titre assessment. The results of DICT strips showed very high sensitivity and specificity as compared to that analyzed by FlockChek enzyme linked immunosorbent assay (F-ELISA) kits. For quantitative immunoassay, it was found that the color intensity measured with DICT was linearly correlated to that of F-ELISA titre (r(2)=0.9687). Therefore, DICT was further applied to the detection of chicken anti-IBDV sera under vaccination in the farms. The average titres of the sampling groups exhibited a strong agreement to that of F-ELISA. Accordingly, the DICT method developed in this study, shown to be reliable, cheap and simple in both qualitative and quantitative immunoassays, is particularly suitable for point-of-need testing (PONT) in agricultural applications.     

Tissue-print hybridization using a non-radioactive probe for the detection of infectious bursal disease virus.

Tissue-print hybridization was evaluated as a simplified means for detection of infectious bursal disease virus (IBDV) in the bursa of Fabricius from infected chickens. The assay employed a biotin-labeled synthetic oligonucleotide as a probe. The bound probe was detected using a color assay consisting of streptavidin conjugated to alkaline phosphatase. Bursae were imprinted onto nitrocellulose and then hybridized with the biotinylated probe. Bursal prints from IBDV-infected chickens were readily distinguished from control prints by color development and differences in signal intensity.