传染性支气管炎病毒M41和Ma5的气管环培养特性研究

本试验以鸡胚气管环纤毛运动作为指示系统，研究传染性支气管炎病毒IBV-M41和IBV Ma5的气管环培养特性。用100 TOC-ID₅₀病毒量的两毒株分别感染鸡胚气管环培养物，观察感染后不同时间气管纤毛的存活率。结果表明，IBV-M41毒株致死气管环上皮细胞的速度要比毒株IBV-Ma5快，说明2个毒株的培养特性与毒力一致。     

鸡传染性支气管炎病毒（IBV）的血清学分型研究

本文动用气管环血清中和试验对１２个ＩＢＶ毒株进行了血清研究。以气管环纤毛运动为指示系统，以能中和２．０ｌｏｇ１０ＣＤ５０同源病毒血清效价为１个抗体单位，含２０个抗体单位的血清与等量病毒作用测定血清对纤毛运动保护百分率，以欧氏距离数字分类分型，并用ＳＰＳＳ软件聚类分型分析。     

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     

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     

鸡传染性法氏囊病河北野毒株的分离研究

采用血清学方法、鸡胚培养、病理组织学检查方法,从河北省不同年份鸡ＩＢＤ免疫鸡群中分离和鉴定了ＨＥ９３,ＨＧ９６,ＸＮ９８和ＨＱ９９ ４个毒株,４个毒株回归鸡的死亡率分别为５０％,４０％,０％和１０％,从年份上看,ＩＢＤＶ毒力有逐渐减弱的趋势。接种鸡胚并传代,前２个毒株均在第一代时鸡胚全部死亡,且出现典型的鸡胚病变,而后２个毒株,初代培养鸡胚不死亡,当传至第４代才出现大部分死亡和鸡胚病变。ＨＥ９３、     

以免疫荧光染色法快速诊断鸡传染性支气管炎病毒

以免疫荧光染色法快速诊断鸡传染性支气管炎病毒利用鸡胚气管环培养（ＴＯＣ）是分离临诊材料中传染性支气管炎病毒（ＩＢＶ）最有效的方法。利用免疫荧光（ＩＦ）染色确定ＴＯＣ中的ＩＢＶ，以１９－２０日龄ＳＰＦ鸡胚气管切成６００μｍ厚的环，ＩＢＶ在ＴＯＣ传代多次...     

鸡传染性法氏囊病毒强毒株的分离鉴定

从广州市郊区某鸡群送检的６周龄曾经ＩＢＤＶ免疫的病鸡法氏囊中分离到１株ＩＢＤＶ强毒。该毒株能使鸡胚于接种后３６～７２小时内死亡，易感鸡１００％发病，５０％死亡。电镜观察，该病毒颗粒直径６０ｎｍ左右，无囊膜。经ＳＤＳ－ＰＡＧＥ检测，病毒核酸有二条ＲＮＡ带。     

鸡肾型传染性支气管炎病毒弱毒株的选育

从南京地区分离的肾病变型传染性支气管炎病毒（ＩＢＶ）经ＳＰＦ鸡胚连续传代至６５代时,对雏鸡无致病性,命名为ＩＢＶ－ＡＴ６５,感染鸡胚的ＥＩＫ５０为１０＾－７．６６/０．２mＬ,鸡胚于接种后５１h开始死亡,存活鸡胚表现为发育受阻、卷缩,肾脏有尿酸盐沉积,其尿囊液对１％鸡红细胞凝集反应为阴性。用ＡＴ６５原液０．２mＬ分别于气 管内接种１０日龄ＡＡ鸡（攻毒前经血凝抑制试验检测ＩＢＶ抗体为阴性）,以及攻毒后将     

传染性支气管炎病毒的鉴定

试验采用鸡胚接种和气管环培养相结合的方法,对IBV毒株进行培养鉴定,IBV经鸡胚传一代后再上鸡胚气管环培养可引起气管环纤毛运动停止,应用此法可以快速地进行IBV检测。     

适应Vero细胞传染性腔上囊病毒X毒株对鸡胚的致病性试验

适应Ｖｅｒｏ细胞传染性腔上囊病毒（ＩＢＤＶ）Ｘ毒株,通过对鸡胚的致死作用、病理变化的结果表明,ＩＢＤＶ Ｘ毒株在Ｖｅｒｏ细胞上传代后,各试验代次毒株均能适应鸡胚,并引起鸡胚死亡,对鸡胚的致病性随传代次数的增加而减弱。     

鸡传染性支气管炎病毒广西分离株血清型的分析

应用病毒感染的鸡胚材料免疫新西兰兔的方法制备抗鸡传染性支气管炎病毒(IBV)单因子血清,然后在鸡胚气管环培养(Tracheal organ cultures,TOC)上对广西分离的7个IBV代表性毒株和3个常用疫苗株进行交叉病毒中和试验。结果显示,10个毒株被分为6个血清型。根据试验所得的R值,应用聚类分析法分析了各血清型毒株之间的亲缘关系,显示目前在广西流行的IBV野毒株之间以及其与疫苗株间的抗原性存在很大程度的差异,分属不同的血清型。同时还对IBV基因分型和血清分型之间的关系进行了探讨。     

Pathogenesis of bovine viral diarrhoea-mucosal disease (BVD-MD) virus infection in tracheal organ cultures

Bovine foetal tracheal organ cultures were infected with two strains of BVD-MD virus and observed for 35 days. The effect of the virus was assessed by observing ciliary activity in gross tissue explants and histological changes in haematoxylin and eosin stained sections. Decrease in ciliary activity and mild epithelial degeneration were first observed at 4 days post infection (p.i.), the epithelial degeneration progressing to complete destruction by day 35 p.i. Viral titres in extracellular fluids rose sharply from day 4 p.i., reached peak levels (10⁵ TCID₅₀/ml) between 15 and 18 days p.i., and eventually declined but persisted at lower titres up to day 35 p.i., when observations were terminated.     

Interferon production by bovine tracheal organ cultures infected with bovid herpesvirus 1 strains.

Studies have been made of antiviral inhibitors produced by bovine tracheal organ cultures inoculated with strains of bovid herpesvirus 1. The inhibitors, which had properties of interferon, were assayed by a plaque-reduction method in bovine turbinate cell cultures with vesicular stomatitis virus as challenge virus. Each of the four strains of bovid herpesvirus 1 studied induced interferon in bovine tracheal organ cultures.     

六株传染性支气管炎病毒的生物学特性鉴定及遗传进化分析

从华南地区疑似传染性支气管炎的病料中,分离到6株传染性支气管炎病毒并对这些分离株进行鸡胚矮小化试验、新城疫病毒干扰试验、血凝特性试验、鸡胚气管环感染试验、S1基因的克隆测序与序列分析。结果表明,各分离株均对鸡胚有明显的致矮小化作用;对新城疫病毒有明显的干扰作用;无直接血凝性,经10g/L胰酶处理后,可凝集鸡的红细胞;对鸡胚气管环有明显的感染致病变作用;利用RT-PCR方法,成功扩增出分离株的S1基因,与参考株S1基因序列比对,其中1株(GD-09II)属于Mass型,剩下5株与LX4型亲缘关系较近。     

Susceptibility of bovine macrophage and tracheal-ring cultures to bovine viruses.

Cultures of macrophages initiated from peripheral blood monocytes and organ cultures of tracheal rings were tested for their susceptibility to bovine viruses. With several notable exceptions, viruses cytopathogenic for bovine embryonic lung cultures were cytopathogenic for macrophages. Although cowpox virus replicated in macrophages, pseudocowpox did not, and although pseudorabies virus replicated within macrophages, infectious bovine rhinotracheitis and DN-599 herpesviruses did not. Bluetongue virus established an interesting relationship with macrophages. Whereas bluetongue virus was initially cytopathogenic for macrophages, it lost its cytopathogenicity on repeated passage, although it was capable of continued replication in macrophages. When subsequently passaged onto bovine embryonic lung cultures, it regained its cytopathogenicity. Parainfluenza-3, bovine viral diarrhea, and infectious bovine rhinotracheitis viruses readily destroyed ciliary activity in tracheal-ring cultures, as contrasted with the inability of bovine respiratory syncytial virus to destroy ciliary activity, even though bovine respiratory syncytial virus was able to replicate within ciliated epithelial cells of tracheal rings.     

Growth kinetic studies of avian infectious bronchitis virus in tracheal organ cultures.

An egg-adapted vaccine strain (H120) and an organ culture-passaged field strain (HV-10) of avian infectious bronchitis (AIB) virus were propagated in tracheal organ cultures and their growth kinetics examined using nine-day-old embryonated fowl eggs and chick tracheal explants for virus assay. When the H120 strain was assayed in embryonated eggs, titres were approximately log10 2-0 ID50 (50 per cent infectious dose) per ml higher than when assays were performed in tracheal explants. The HV-10 strain, assayed in tracheal explants, yielded higher titres than did the H120 strain, but when assayed in embryonated eggs, yielded only minimal and variable virus titres.     

Characterization of infectious bronchitis viruses isolated from outbreaks of disease in commercial flocks in Brazil

Fifteen isolations of infectious bronchitis (IB) virus were made from a total of 126 Brazilian poultry flocks of all ages that were examined. These flocks (14 chicken and 1 quail) were experiencing a variety of IB-like conditions including respiratory disease, digestive and kidney problems, and drops in egg production. One of the isolates was of the Massachusetts serotype. The remainder were examined by means of cross-neutralization tests in tracheal organ cultures and were shown to belong to at least four antigenic groups, all different from ones described previously in other countries. Some, but not all, of the flocks from which they were isolated had been vaccinated against IB with vaccines of the Massachusetts serotype. In vivo protection studies showed that the MA5 vaccine (of the Massachusetts serotype) protected well against challenge with four of these isolates, representing the different serotypes reported in this study.     

The resistance to reinfection of tracheal organ cultures from chickens previously infected with avian infections bronchitis virus.

Lower titres of avian infectious bronchitis (AIB) virus were found following the infection of tracheal organ cultures prepared from chickens that had been given AIB virus intranasally six weeks previously than were found following the infection of organ cultures prepared from untreated or from passively-immune chickens. No infectious virus was found in the tracheal organ cultures at the time they were prepared.