猪伪狂犬病毒分离和鉴定

从病猪肾脏分离到1株病毒.该病毒接种Balb/c小鼠出现神经症状,死亡率为50%,接种Vero出现拉网病变;伪狂犬病毒(pseudorabies virus,PRV)阳性血清能特异中和该分离毒;根据基因库(genebank)的PRV gD基因(AY169694)设计的引物能扩增出特异性片段.以上结果证实该病毒为伪狂犬病毒.     

一例猪伪狂犬病毒的分离和鉴定

从病猪肾脏分离到1株病毒,该病毒接种Palb/c小鼠出现神经症状,死亡率为60%,接种PK-15细胞出现拉网病变,阳性血清能特异性的中和该分离病毒,根据基因库(genebank)的PRVgE基因设计的引物能扩增出特异性片段。以上结果证实该病毒为伪狂犬病毒。     

猪伪狂犬病病毒北京株的分离鉴定

从北京某猪场疑似猪伪狂犬病发病死亡仔猪脑及内脏中分离到1株病毒并进行了鉴定。该分离毒株接种ST细胞24 h后出现圆缩、聚集、脱落等典型的细胞病变(CPE);分离毒株能够被伪狂犬病病毒标准阳性血清中和;分离病毒接种家兔后,引起家兔出现奇痒等典型的伪狂犬病临床症状;同时根据GenBank公布的PRV的gD基因设计引物并扩增出特异性的目的片段,扩增产物经过测序比较,表明扩增产物序列为猪伪狂犬病病毒基因序列。以上结果证实该病毒为猪伪狂犬病病毒,依据分离地点命名为猪伪狂犬病病毒北京株。     

猪伪狂犬病毒的分离和鉴定

从病猪肾脏分离到1株病毒.该病毒接种的Balb/c小鼠出现神经症状,死亡率为60%,接种PK-15细胞出现拉网病变,猪的狂犬病毒阳性血清能特异性的中和该分离毒.根据基因库(genebank)的PRV gE基因设计的引物能扩增出特异性片段,结果证实该病毒为伪狂犬病毒.     

潍坊某猪场一起伪狂犬病的诊治

2014年9月山东潍坊某猪场发生疑似猪伪狂犬病疫情,采集病死仔猪的脑组织等,利用Vero细胞做病毒分离,并设计一对伪狂犬病病毒(PRV)g E基因片段的特异性引物对分离病毒进行PCR鉴定及家兔接种试验。结果表明:脑组织上清液接种Vero细胞后有典型的细胞病变;PCR扩增产物电泳后显示出990bp长的目的片段,目的片段基因序列与6株PRV毒株的g E基因序列核苷酸同源性在97.7%~100%之间,证实该病毒为PRV;分离病毒接种家兔出现典型的伪狂犬病症状。临床诊断结合实验室鉴定以及动物接种试验,确诊该病例为猪伪狂犬病。     

猪伪狂犬病病毒的分离和鉴定

从病猪脑部分离到1株病毒.该病毒接种Balb/c小鼠出现神经症状,病死率为60% ,接种PK-15细胞出现拉网病变.伪狂犬病阳性血清能特异性的中和该分离毒.根据基因库(GenBank)的PRV gE基因设计的引物能扩增出特异性片段,证实该病毒为伪狂犬病病毒.     

一株水貂源伪狂犬病毒株的分离鉴定

从辽宁大连疑似水貂伪狂犬病发病死亡水貂脑、内脏中及饲喂的猪肝中分离到1株病毒并进行了鉴定。该分离毒株接种BHK-21细胞24 h后出现圆缩、聚集、脱落等典型的细胞病变(CPE);分离毒株能够被伪狂犬病病毒标准阳性血清中和;分离病毒接种家兔后,引起家兔出现奇痒等典型的伪狂犬病临床症状;同时根据Gen Bank公布的PRV的Tg ET基因设计引物并扩增出特异性的目的片段,扩增产物经过测序比较,表明扩增产物序列为猪伪狂犬病毒g E基因序列。以上结果表明,该病毒为伪狂犬病毒,依据来源确定为水貂源性伪狂犬病病毒株。     

一株伪狂犬病病毒的分离及鉴定

为了从北京市周边郊区某猪场发病仔猪的脑组织中分离到伪狂犬病病毒,试验采用细胞培养、空斑纯化、PCR鉴定、动物感染试验、电镜观察的方法进行分离。结果表明:家兔接种病毒后可引起典型的伪狂犬病症状,继而死亡;PK-15细胞接种病毒出现典型细胞病变,毒价为1×108TCID50/m L;电镜观察可见圆形、有囊膜、直径为150~180 nm大小的病毒颗粒;PCR反应可扩增出特异性长为1 783 bp的DNA片段。说明该分离株为猪伪狂犬病病毒野毒株。     

一株小反刍兽疫病毒的分离鉴定与生长曲线测定

将含高滴度小反刍兽疫病毒的新鲜病料研磨后接种VERO DS细胞系进行病毒分离,出现细胞病变后连续传代,取3代以上培养物,进行RT-PCR和间接免疫荧光试验及生长曲线测定。生长曲线测定分别以0.01和0.1 MOI接种VERO DS细胞,每隔12h测定病毒滴度,连续培养168h,绘制病毒生长曲线,分析生长特性。结果显示,病料接种细胞72h后,出现细胞病变,经RT-PCR和间接免疫荧光试验鉴定为小反刍兽疫病毒?;生长特性研究显示,0.01和0.1 MOI两种病毒接种量,病毒滴度最高均为106 TCID50左右,但峰值出现时间和下降速度存在差异,0.01 MOI接种量出现峰值晚,但是维持高滴度时间较长。本文成功分离一株小反刍兽疫病毒,并对两种接毒量的生长特性差异进行了初步分析,为探索该病毒培养方法和收毒时间提供了借鉴。     

一例猪伪狂犬病毒的分离和鉴定

从送检的2日龄病猪脑部分离到1株病毒。该病毒接种的Balb／c小鼠出现了典型的伪狂犬病症状,接种BHK-21细胞48h后出现了圆缩、集聚,脱落等典型的细胞病变,猪狂犬病毒阳性血清能特异性的中和该分离病毒。根据GenBank公布的PRV的gE基因设计的引物能扩增出特异性片段,证实该病毒为伪狂犬病毒。     

奶牛肢蹄病及其防治

简介常见奶牛肢蹄病种类及其症状,从日粮营养、运动场地面结构、环境卫生、饲养管理、遗传育种、疾病管理等方面简析奶牛肢蹄病的病因,并提出相应的预防措施。     

Disease and destiny-mystery and mastery

When early people made their appearance, zoonotic infectious diseases were already waiting, but epidemic diseases did not appear in human history until people began to live in large numbers under conditions of close contact, mainly during the last 10,000 years. Disease has decimated urban populations, conquered armies, and disrupted society. The focus here is on (1) the plague of Athens and the Black Death; (2) smallpox, influenza, and rabies; (3) avian influenza prion diseases, and foot & mouth disease; and (4) emerging and re-emerging diseases. All have veterinary public health associations. In Athens, Greece, in 430 BC, when the Spartans ravaged the countryside, hordes crowded into Athens so that orderly movements, space in which to live, and adequate supplies of food became impossible. Crowding of any population fosters disease transmission; chaos and disorder enhance it all the more. Out of northern Egypt came a terrible plague from across the Mediterranean Sea. The identity of the plague of Athens remains unsure, but the well-considered conclusion is Rift Valley Fever, a mosquito borne, viral zoonosis. The Black Death, also called the Plague, raged in Asia for centuries. In 1347, the Black Death was brought by a ship out of Asia to Sicily. The scenes of devastation were repeated throughout Europe, with 90% or more of the people dying in city after city. Influenza, too, has been a cause of periodic human epidemics, but the great pandemic of influenza occurred in the last months of World War I. In the years of highest occurrence, more than half the world's population became clinically infected. If veterinary public health had been born earlier, it could have led to elucidating the epidemiology of influenza and the plagues of Athens, Europe, and Asia. In turn, smallpox had also caused continual tragedy. In 1796, Edward Jenner began to harvest pustules of cowpox from children or infected cows and inject them into susceptible children. In 1980, the World Health Organization declared that smallpox had been eliminated from the world. Rabies, though, still strikes terror. A number of animal diseases, broadly termed emerging and re-emerging diseases, need surveillance because they have the potential to impact human health. From late in 2003 to 2007, the highly pathogenic H5N1 influenza virus in poultry infected at least 121 people and caused 62 deaths in four countries. The prion diseases, too, all have very high numbers in concentrated contacts. To control these diseases, veterinary public health is essential, with diagnosis, epidemiological surveillance, clinical manifestations, and prevention as primary measures.     

畜禽物种多样性及其保护和利用

文章就我国畜禽物种多样性资源的现状、保护和利用等方面进行阐述,为生态脆弱的喀斯特地区畜牧业可持续发展提供参考。     

马的咽气癖及其防制措施研究进展

在动物的异常行为中以刻板行为最为常见,而咽气癖又是马最常见的口部刻板行为之一。作者就咽气癖在生理方面和心智方面对马体产生的影响、行为基础、诱因的研究进展及常见的防治措施进行综述。     

Foot and mouth disease and bluetongue: differences and similarities

On 26th of july 2007 a new case of bluetongue was notified in the Netherlands and on 2nd of august 2007 foot-and-mouth disease was diagnosed in Surrey, England, which raised the threat of having both infections simultaniously in one area. Bluetongue and foot-and-mouth disease have a different pathogenesis, but symptoms may resemble each other at a later stage of infection. The pathogenesis and possible clinical symptoms of both infections are discussed and illustrated with pictures.     

德国荷兰畜禽产品质量安全交流与启示

2018年岁末,笔者有幸赴德国和荷兰,就畜产品质量安全控制及检测技术等进行了短期交流,收获颇丰,现具体介绍如下。一、交流情况德国面积35.73万平方千米,人口约8175.2万,是欧盟人口最多的国家,农业发达,机械化程度很高。德国的畜牧业以猪、牛、羊和禽类为主,畜牧业产值占农业生产总值的61%。德国虽然农业比重很小,但却是有机农业运动最早的发起国,也是目前世界上有机农产品生产与消费大国。     

广西芒果主要病虫害及其防治

广西是我国主要的芒果生产基地。随着基地建设的发展,芒果病虫害已成为目前栽培管理的主要问题。为此,在调查、研究的基础了介绍了当前芒果生产中常见的病虫害,并提出了防治措施,以期为生产上提供技术参考。     

RFLP和PCR-RFLP标记与牦牛遗传育种研究

在归纳总结RFLP和PCR-RFLP标记技术的原理、优缺点的基础上,系统论述了其在牦牛遗传育种研究中的应用现状,并提出了个人的建议和看法。     

国内外蛋氨酸与赖氨酸市场分析与展望

近几年,世界饲用添加剂市场增长较快,预计今后将进一步增长,据世界粮农组织(FAO)首领会议的倡议,到2015年,将使世界营养不良的人口削减一半,其间,肉制品将会以每年2％的速度增长,特别是加快猪肉和禽肉增长。这将促进世界添加剂,尤其是蛋氨酸和赖氨酸需求量的增加。