腺胃型鸡传染性支气管炎病毒Hu98株的分离鉴定

１９９８年首次从哈尔滨市某鸡场鸡腺胃肿大为特征的病例中分离到ＩＢＶ－Ｈ９８毒株。将该病毒株接种ＳＰＦ鸡胚并传至５代（Ｆ５）,结果接种胚出现规律性死亡和典型胚胎病变特征,ＥＩＤ５０为１０＾－６．４０／０．２ｍＬ。ＩＢＶ－Ｈｕ９８Ｆ５感染ＳＰＦ鸡胚尿囊液经负染电镜观察,可见直径为８０￣１２０ｎｍ、有囊膜和纤突的冠状病毒粒子。用ＩＢＶ－Ｈｕ９８Ｆ５毒株人工感染１日龄ＳＰＦ鸡能引起与自然病例相似的病理组织     

腺胃病变型鸡传染病支气管炎病毒分离株（IBV—D971）对SPF？…

用腺胃病变型鸡传染性支气管炎病毒分离株ＩＢＶ－Ｄ９７１毒株接种１日龄ＳＰＦ鸡,可引起６０％死亡。该毒在ＳＰＦ鸡体传２代后,接种１日龄ＳＰＦ鸡,可引起１００％死亡。对人工感染病例进行了系统的病理学观察,主要的眼观病理变化为腺胃胃壁增厚,乳头消失或乳扁平,乳头顶部凹陷坏死,肾肿大,尿酸盐沉积。     

鸡传染性腺胃炎病原分离及鉴定

１９９８ 年６ 月～７ 月，河北省玉田县某个体户蛋种鸡场孵化出的海赛商品蛋鸡连续７ 批共６ 万余羽，在３０～８０ 日龄时发生一种以极度消瘦、腺胃肿大为特征的疾病。采集发病鸡的腺胃制成匀浆乳剂，接种 Ｓ Ｐ Ｆ鸡胚，可引起典型的鸡胚矮小。卷曲、僵化、中肾尿酸盐沉积等鸡胚病变。电镜观察鸡胚分离物可见大量冠状病毒粒子；分离物能与标准 Ｉ Ｂ Ｖ 阳性血清（ Ｍ４１ 株抗血清）中和呈现阳性反应；分离物经浓缩后用魏氏梭菌滤液处理，可呈现血凝活性；分离物对氯仿敏感；实验结果表明，分离物为传染性支气管炎病毒。将发病鸡的腺胃匀浆乳剂及第５ 代分离物（腺胃匀浆乳剂在鸡胚中盲传５ 代的培养物），接种１ 日龄及７日龄 Ｓ Ｐ Ｆ鸡，结果用鸡腺胃匀浆乳剂接种 的鸡出现了极度消瘦、腺胃肿大等与自然病鸡相同的临床症状及剖检变化，而用第５代分离物接种鸡后，鸡只正常生长发育，未出现任何症状。分别取２ 个组鸡的血清进行１７ 种相关病原检测，结果接种腺胃匀浆乳剂的鸡只检出了网状内皮组织增生病病毒（ Ｒ Ｅ Ｖ） 抗体， 表明腺胃内可能存在 Ｒ Ｅ Ｖ；另外，２ 个组的鸡 Ｉ Ｂ Ｖ 抗体均为阳性，除此之外其他病原抗体监测结果均为阴性。初步的试验结果证实，我们从发病鸡腺胃内分离的     

鸡法氏囊国外弱毒病毒的分离与鉴定（初报）

我们对国外引入的ＩＢＤ弱毒疫苗进行了分离，复制和测定，该病毒可接种ＳＰＦ鸡胚增殖，致难胚死亡，并产生ＩＢＤ病变；在ＳＰＦ鸡胚ＣＦＦ上繁殖，产生ＣＰＥ变化，并可被行异性ＩＢＤ抗血清中和；琼脂扩散与ＩＢＤ（＋）血清有明显的沉淀线，因此说明所分离的毒株是ＩＢＤ病毒，并测得其毒价为１０＾－６ＴＣＩＤ５０。     

鸡传染性法氏囊病超强毒LX株的分离鉴定

从一免疫失败鸡场中分离到１株鸡传染性法氏囊病野毒株,命名为ＬＸ株。经血清学、鸡胚接种、病毒形态、外源病毒（ＣＡＡ、ＮＤＶ和ＩＢＶ）排除试验等证实该分离物为纯净的ＩＢＤＶ。人工感染试验表明,该ＬＸ株接种８龄ＳＰＦ鸡后第２天鸡只精神 沉郁,拉白色或绿色粪便,发病率为１００％,第３￣４天出现死亡高峰,而后很少引起死亡,死亡率达９２．３％,剖检可见全身性出血素质,法氏囊呈“紫葡萄样”外观,脾脏肿大,胸腺萎     

鸡传染性腺胃炎病原的分离鉴定

河北省某个体户蛋用种鸡场连续孵化出的７批海赛商品雏鸡共６万余只，在３０－８０日龄时发生一种以极度消瘦、腺胃肿大为特征的疾病。采集发病鸡的腺胃进行病原分离鉴定，从中分离出传染性支气管炎病毒（ＩＢＶ）。将发病鸡的腺胃匀乳剂及第５代鸡胚分离物接种ＳＰＦ鸡，结果用鸡腺胃匀尔剂接种的了与自然病鸡盯同的临床症状，而用第５代鸡胚分离物接种的鸡未能复制出胃肿大病例。取各接种绥鸡血清进行了１７种相关病原抗体检测，结     

鸽新城疫病毒的分离及其生物学特性测定

用ＳＰＦ鸡胚从疑似鸽新城疫（鸽ＮＤ）病鸽群中分离到一株病毒ＱＬ株,该病毒株能凝集鸡红细胞（ＲＢＣ）,这种凝集作用能被抗新城疫病毒（ＮＤＶ）阳性血清抑制;用抗ＮＤＶ单抗ＰＥＧ夹心ＥＬＩＳＡ测定分离株为阳性。分离株经肌肉注射能使鸽发病和死亡,出现与自然发病鸽一致的症状和病变,但肌注ＳＰＦ鸡只感染,不见临床症状。对该分离株作进一步生物学特性鉴定,按照国际上规定的ＮＤＶ毒力判定标准,测定了该毒株最低致死量致死鸡胚的平均死亡时间（ＭＤＴ）、１日龄雏鸡脑内接种致病指数（ＩＣＰＩ）和６周龄雏鸡静脉接种致病指数（ＩＶＰＩ）,结果ＭＤＴ为１０５小时、ＩＣＰＩ为１．３３、ＩＶＰＩ为１．０。试验结果表明本分离株为鸽新城疫病毒。     

鸡传染性法氏囊病野毒株的分离鉴定及河北弱毒株培育的研究

从河北省６个地区鸡传染性法氏囊病（ＩＢＤ）的鸡群中，分离到６株强毒，均能使易感鸡３６小时发病并死亡，发病率达６０～１００％，死亡率１０～７０％。人工感染鸡能见到与野外病例相同的病变。经血清学试验、鸡胚接种、电镜观察均证明，分离物为传染性法氏囊病毒（ＩＢＤＶ），其中有的毒株，毒力非常强。利用其中毒力最强的１株病毒，经鸡胚多次传代培养育成１株免疫原性好，免疫期长，免疫效果容易监测的弱毒株，经野外试验证明，该毒株是防治ＩＢＤ的一个很理想的毒株。     

鸡传染性喉气管炎,传染性支气管炎和新城疫病毒对10个家系B …

用传染性喉气管炎（ＩＬＴ）强毒株感染１０个家系１５０日龄ＢＷＥＬ－ＳＰＦ鸡,观察比较临床症状和剖检所见病变;用传染性支气管炎（ＩＢ）强毒株和新城疫（ＮＤ）疫苗株分别接种这１０个家系的鸡胚,收获胚液并测定其毒价,从而评估这三种呼吸道病毒在每个家系鸡或鸡胚上的敏感性。     

鸡腺胃型传染性支气管炎的诊断及病毒分离鉴定

天津市部分鸡场发生一种以病鸡极度消瘦、拉稀和死亡为主要特征的传染病,经鉴定确诊为鸡腺胃型传染性支气管炎（ＧＩＢ）,并分离出ＩＢＶ ＪＢ９７０２株,ＨＡ效价为２＾１２,ＥＩＤ５０为１０＾－６．８１／０．２ｍＬ。病毒干扰试验中,ＩＢＶ ＪＢ９７０２＋ＮＤＶ ＬｓＡｏｔａ接种鸡胚ＨＡ效价为２＾４～６,ＬａＳｏｔａ接种鸡胚ＨＡ效价为２＾１０～１１;用ＩＢＶ ＪＢ９７０２病毒液１：１０稀释后感染经ＩＢＶ Ｈ     

Pathogenicity and antigenicity of a new variant of Korean nephropathogenic infectious bronchitis virus

Despite the existence of an active vaccination program, recently emerged strains of nephropathogenic infectious bronchitis virus (IBV) in Korea have caused significant economic losses in the poultry industry. In this study, we assessed the pathogenic and antigenic characteristics of a K-IIb type field strain of IBV that emerged in Korea since 2003, such as Kr/Q43/06. Specific pathogen free 1-week-old chickens exhibited severe respiratory symptoms (dyspnea) and nephropathogenic lesions (swollen kidneys with nephritis and urate deposits) following challenge with the recent IBV field strain. The antigenic relatedness (R value), based on a calculated virus neutralization index, of the K-IIb type field strain and K-IIa type strain KM91 (isolated in 1991) was 30%, which indicated that the recent strain, Kr/Q43/06, is a new variant that is antigenically distinct from strain KM91. This report is the first to document the emergence of a new antigenic variant of nephropathogenic IBV in chicken from Korea.     

First evidence of the emergence of novel putative infectious bronchitis virus genotypes in Cuba

The emergence of new infectious bronchitis virus (IBV) genotypes or serotypes along with the poor cross-protection observed among IBV serotypes have complicated the avian infectious bronchitis (IB) control programs in different geographic regions. In Cuba, the lack of genetic information regarding IBV and the increasing epidemiological importance of this virus in Cuban chicken flocks demand further characterization of IBV isolates. In the present work, studies of genetic diversity and phylogenetic relationships among recent IBV isolates from Cuban chicken flocks showing respiratory disorders were performed. Two putative genotypes genetically different to the Massachusetts genotype H120 strain used in the Cuban vaccination program were found in the flocks assessed. In addition, a potential nephropathogenic IBV isolate was found by first time in Cuba.     

Genetic diversity of avian infectious bronchitis virus isolates in Korea between 2003 and 2006

Thirty-three field isolates of avian infectious bronchitis virus (IBV) were recovered from commercial chicken flocks in Korea between 2003 and 2006 and were characterized phylogenetically by nucleotide sequence analysis of the IBV S1 gene hyper-variable region. Our phylogenetic analysis revealed that recent field isolates of IBV formed at least three distinct phylogenetic types, including K-I, K-II, and K-III. K-I type IBV consisted of indigenous, 13 IBV isolates which evolved from the Kr-EJ/95 strain and then separated into the lineages of type K-Ia and type K-Ib. K-II type IBV isolates (n = 19) were closely related to nephropathogenic IBV variants from China and Japan. The K-III type isolate (Kr/D064/05), first identified by this study, was closely related to enteric IBV variants from the Chinese strains that cause proventriculitis. Sequence comparisons showed amino acid differences of >27.5% between IBV types. The molecular epidemiologic characteristics of IBV field isolates are briefly discussed.     

鸡传染性支气管炎病毒CK/CH/LHLJ/04V的分离鉴定及致弱的初步研究

从黑龙江省某鸡场发病鸡群的肾脏中分离到一株病毒,通过病毒致SPF鸡胚病变特征、对鸡外周血红细胞凝集特性、病毒粒子形态学特征以及RT-PCR鉴定等方面的研究,表明该病毒为鸡传染性支气管炎病毒,并命名为CK/CH/LHLJ/04V。通过对该病毒基因型分析以及对SPF鸡致病性试验发现该病毒为我国近年来流行的一类重要IBV的代表。将该毒株在SPF鸡胚连续传代110代(P110),取不同代次毒进行动物实验。结果显示,该毒株对SPF雏鸡的致病力随鸡胚传代次数的增加而逐渐降低。P110代毒以105.0 EID50/0.1 mL的剂量通过点眼滴鼻接种15日龄SPF雏鸡,鸡群发病率和死亡率均为0。不同代次毒接种SPF鸡对同源毒株P3代强毒的攻击均具有100%保护性。实验表明,IBV毒株CK/CH/LHLJ/04V P110对SPF雏鸡已无致病性,但仍具有良好的免疫原性,可作为研制IB弱毒疫苗的候选毒株。     

鸡传染性支气管炎病毒上海株的分离与鉴定

本研究对分离自上海某养鸡场的疑似鸡传染性支气管炎病毒(Infectious bronchitis virus,IBV)进行了分离和鉴定.所采用的方法有:鸡胚致病性试验、对鸡新城疫病毒(Newcastle disease virus,NDV)的干扰试验、动物回归试验以及RT-PCR鉴定等.试验结果表明,该病原接种鸡胚后,48 h可引起鸡胚死亡,胚体呈侏儒样变化,对NDV感染有明显干扰作用;用分离的病毒接种SPF雏鸡可产生明显呼吸道症状,肾脏表现肿大和大量尿酸盐沉积等病理变化;用IBV特异性引物可以从分离物中扩增出IBV的N基因序列,测序结果表明,该毒株属于肾型IBV.综上所述,本研究在上海流行区域成功分离到一株IBV,将其命名为SH11株.     

鸡新城疫病毒与传染性支气管炎病毒同胚培养的试验研究

将鸡新城疫病毒（NDV）和鸡传染性支气管炎病毒（IBV）按一定的稀释比例等量混合接种9~10日龄SPF鸡胚,让其在同一鸡胚中增殖（简称同胚培养）。试验结果表明,用5倍稀释的ND-Lasota病毒液与 5000倍稀释的IBH₁₂₀病毒液等体积混合后尿囊腔接种鸡胚,能在同一鸡胚中正常增殖,接种后96 h收毒,用红细胞凝集试验（HA）测得NDV、IBV两种病毒的血凝价分别为11 log2和12 log2,不低于各自病毒单独增殖的HA滴度,病毒的增殖基本趋于平衡。同时也证实了在合适的培养条件下,IBV对NDV的复制不会产生干扰。     

Detection of infectious bronchitis virus antigen from experimentally infected chickens by indirect immunofluorescent assay with monoclonal antibody

Infectious bronchitis virus (IBV) was detected by indirect immunofluorescent assay with a monoclonal antibody (MAb-IFA). The monoclonal antibody was specific for the nucleocapsid protein of IBV strain M41. The MAb-IFA clearly detected IBV with high specificity in infected chicken kidney cells. The assay furthermore detected IBV in tracheal smears and sliced tracheas from experimentally infected chickens. The positive reaction was found to be longer than that in the virus recovery test. These results indicate that MAb-IFA is a useful method for the detection of IBV from chickens suspected to have infectious bronchitis.     

不同来源传染性支气管炎病毒诱导SPF鸡发病的免疫机制研究

试验旨在探讨不同来源的传染性支气管炎病毒(Infectious bronchitis virus,IBV)诱导SPF鸡发病的免疫机制。选用140只1日龄SPF白来航鸡,随机分为4组,3组攻毒组通过滴鼻点眼途径分别接种鸡源IBV强毒株、鸡源IBV弱毒株和野鸡源IBV毒株3个毒株,对照组以同种方式接种等量灭菌的磷酸盐缓冲液。在感染后12 h、36 h、72 h、7 d和14 d,每组随机选取5只进行剖检,并分别采集法氏囊、肾脏和气管组织,剩余鸡用于观察临床症状、发病及死亡情况。应用实时荧光定量PCR检测攻毒后不同时间点采集的各组织中IBV的病毒载量、Toll样受体(Toll-like receptors,TLRs)及部分细胞因子(白细胞介素(interleukin,IL)和干扰素(interferon,IFN))表达量的变化。结果显示,感染不同来源IBV毒株之后仅鸡源IBV强毒株感染组SPF鸡出现抑郁、翅膀下垂、甩头等典型的临床症状,且在感染后5~10 d共有7只死亡,死亡率为20%。病理剖检发现,感染鸡源IBV强毒株的鸡肾脏肿大、尿酸盐沉积和有花斑样病变,而感染野鸡源IBV毒株、鸡源IBV弱毒株和对照组的鸡无明显的眼观病变。实时荧光定量PCR结果显示,在鸡源IBV强毒株组的法氏囊、肾脏和气管3个组织中均检测到病毒。对照组和野鸡源IBV毒株组中均未检测到病毒,鸡源IBV弱毒株组只在部分组织中检测到病毒。在感染后72 h,鸡源IBV强毒株组与其他各组相比,TLR1、TLR2、TLR3、TLR5、TLR7和TLR15基因在法氏囊中的表达量均显著升高(P<0.05),IL-6和IFN-β参与更强烈的抗病毒免疫反应;在感染后7 d,鸡源IBV弱毒株组与其他各组相比,肾脏中TLR2、TLR3、TLR15、TLR21、IL-6和IL-18基因表达量均显著升高(P<0.05)。野鸡源IBV感染后36 h法氏囊组织中IFN-γ基因表达量显著上调(P<0.05)。综上所述,3个IBV毒株中仅鸡源IBV强毒感染引起SPF鸡典型临床发病症状与可视组织病变,且可提高SPF鸡组织中免疫相关因子的基因表达量。本研究结果揭示,不同来源的IBV对SPF鸡的不同致病性与其感染诱导的免疫反应不同有关。     

鸡传染性支气管炎病毒SC株N基因序列测定与同源性分析

从我国四川省一疑似鸡传染性支气管炎(Avianinfectious bronchitisvirus，IB)的雏鸡病料中成功分离到一株鸡传染性支气管炎病毒(Infectious Bronchitis Virus，IBV)，命名为SC。病毒经鸡胚传代、血凝试验监测和负染电镜检查证实为IBV。自接毒鸡胚尿囊液中提取RNA后应用反转录-聚合酶链反应(RT-PCR)扩增得到了IBVSC株mRNA6 cDNA(编码N蛋白)。应用DNAstar5．06，Clustal1．8分析软件将克隆测序的N蛋白基因与Genbank中11株国内外参考毒株进行序列比较分析和同源性分析，发现IBV SC株变异独特，明显不同于国内外参考毒株。     

Attenuation, safety, and efficacy of an infectious bronchitis virus GA98 serotype vaccine

In 1998, novel strains of infectious bronchitis virus (IBV) were identified in chickens from the southeastern United States and classified as a new serotype designated Georgia 98 (GA98). Because of the widespread nature of the GA98 virus in the southeastern United States and the lack of adequate protection with the DE072 vaccine, we developed a specific vaccine for the GA98 serotype. The GA98/0470/98 isolate of IBV was passaged in embryonating chicken eggs 70 times, and attenuation of the virus was determined in specific-pathogen-free chicks. Pass 70 of the GA98/0470/98 strain of IBV when given at 1 day of age by coarse spray and at 14 days of age in the drinking water at 1 x 10(4.5) 50% embryo infectious dose/bird protected against the homologous GA98 challenge as well as provided good protection against the DE072-type virus. In addition, the vaccine was shown to be adequately attenuated and safe at a 10x dosage.