牛呼吸道合胞体病毒的病原学与诊治

牛呼吸道合胞体病毒(Bovine respiratory syncytialvirus,BRSV)属副黏病毒科、肺病毒属。牛、绵羊、山羊及其他动物易感,大多数为无症状感染,但集约化养殖的刚断奶犊牛及青年牛可致肺炎、间质性肺水肿及肺气肿等呼吸道疾病,一般发病率高,死亡率低。1生物学特性病毒粒子通常呈球     

牛呼吸道合胞体病毒引起牛呼吸道疾病的诊治

牛呼吸道合胞体病毒(BRSV)是引起犊牛呼吸道疾病的主要病原之一。本病早在1968年就有记载,1970年BRSV首次从患有呼吸道疾病的牛体中分离到。其危害性在于,BRSV感染发病率很高,达60%~80%,死亡率有时也能达到20%以上。本病多发于秋、冬季节,主要感染牛、绵羊、山羊,也可感染猪和     

牛呼吸道合胞体病诊断和预防研究进展

牛呼吸道合胞体病(BRSD)是由牛呼吸道合胞体病毒(BRSV)引起的一种呼吸道传染病,是牛呼吸道疾病综合征(BRDC)的主要疾病之一。BRSV传染性强,可在全球广泛流行,对养殖业造成重大经济损失。动物感染BRSV后,可引起细支气管炎和间质性肺炎或不表现任何症状,因此确诊BRSD需将临床症状与实验室检测相结合。本文主要对BRSD的病原学、临床症状与病理学特征、检测方法及预防等方面进行论述,对深入了解该病的诊断和预防具有一定意义。     

牛呼吸道合胞体病毒主要编码蛋白研究进展

牛呼吸道合胞体病毒(BRSV)是引起反刍动物呼吸道疾病的主要病毒之一,犊牛对该病毒的感染率、发病率和病死率均较高,严重危害养殖的经济效益。牛呼吸道合胞体病毒主要编码蛋白F蛋白和G蛋白上的某些抗原表位可刺激中和抗体反应,而且是BRSV唯一能够在动物模型中诱导中和抗体并产生保护性免疫应答的蛋白。N蛋白具有高度保守性,可诱导BRSV的保护性免疫,小疏水性蛋白(SH)有助于维持病毒外壳稳定性。目前,在该病的防控措施上仍然存在未解决的问题,可根据BRSV编码蛋白的不同特性与功能,研发出一种免疫效果良好、安全高效的疫苗,用以防控BRSV的感染。     

牛呼吸道合胞体病毒的分离鉴定

从黑龙江省某牛场患有呼吸道疾病的病牛鼻汁中分离到1株病毒,并对其进行了系统鉴定.结果该病毒株能在Vero细胞上增殖并产生特征性的合胞体形态的细胞病变;病毒对5-碘脱氧尿核苷不敏感,对酸、氯仿、乙醚均敏感,不耐热,56℃加热30 min可被灭活,且无血凝性和血吸附特性;该病毒能被牛呼吸道合胞体病毒(BRSV)标准阳性血清中和;应用特异性引物,通过反转录-聚合酶链式反应可从病毒细胞培养物中扩增出BRSV N基因中596 bp的特异性片段,并且分离株与GenBank中BRSV毒株N基因相应片段的核苷酸序列同源性为97.8%～99.3%.以上结果表明所分离到的病毒为牛呼吸道合胞体病毒,命名为BRSV HJ株.     

牛呼吸道合胞病毒的研究进展

牛呼吸道合胞病毒的研究进展朱其太（连云港动植物检疫局·江苏·２２２０４２）收稿日期：１９９６－１２－３０牛呼吸道合胞病毒（ＢｏｖｉｎｃＲｅｓｐｉｒａｔｏｒｙＳｙｎｃｙｔｉａｌＶｉｒｕｓ，ＢＲＳＶ）是引起犊牛呼吸道疾病的主要病毒。１９６８年，Ｄｏｇｇｅ...     

牛呼吸道合胞体病毒的流行与诊断

牛呼吸道合胞体病毒是引起牛呼吸道疾病综合征的主要病原之一.该病毒在世界各地广泛分布,牛群中的流行与感染率较高.本文主要介绍了牛呼吸道合胞体病毒的流行病学与诊断.     

牛呼吸道合胞体病：免疫病理学机制

牛呼吸道合胞体病毒（BRSV）是犊牛呼吸道疾病的重要病因，与人呼吸道 包体病毒（HRSV）及其相应的疾病有许多相似性，故认为免疫病理学机制参与了呼吸道合胞体病毒（RSV）感染的致病作用，本文分析了免疫病理学机制在RSV感染和疫苗诱导超敏反应中的作用，讨论了与RSV感染的非免疫病理学机制。     

A Field Outbreak Caused by Bovine Respiratory Syncytial Virus

Bovine respiratory syncytial virus (BRSV) caused a large epizootic of acute respiratory disease in Japan in 1968—69 (Inaba et al. 1970, Inaba et al. 1972). A much smaller outbreak occurred in Switzerland (Paccaud & Jacquier 1970). In Belgium the virus has been isolated from an outbreak of respiratory disease (Wellemans et al. 1970). BRSV has later been proved an important causal agent of respiratory disorders in the same country (Wellemans & Leiinen 1975). In England and USA the virus has caused and been isolated from outbreaks of acute respiratory disease in calves (Jacobs & Edington 1971, Rosenquist 1974, Smith et al. 1974). In Denmark BRSV has sporadically been isolated from pneumonic calf lungs (Bitsch et al. 1976).     

Spatial patterns of Bovine Corona Virus and Bovine Respiratory Syncytial Virus in the Swedish beef cattle population

Background

Both bovine coronavirus (BCV) and bovine respiratory syncytial virus (BRSV) infections are currently wide-spread in the Swedish dairy cattle population. Surveys of antibody levels in bulk tank milk have shown very high nationwide prevalences of both BCV and BRSV, with large variations between regions. In the Swedish beef cattle population however, no investigations have yet been performed regarding the prevalence and geographical distribution of BCV and BRSV. A cross-sectional serological survey for BCV and BRSV was carried out in Swedish beef cattle to explore any geographical patterns of these infections.

Methods

Blood samples were collected from 2,763 animals located in 2,137 herds and analyzed for presence of antibodies to BCV and BRSV. Moran''s I was calculated to assess spatial autocorrelation, and identification of geographical cluster was performed using spatial scan statistics.

Results

Animals detected positive to BCV or BRSV were predominately located in the central-western and some southern parts of Sweden. Moran''s I indicated global spatial autocorrelation. BCV and BRSV appeared to be spatially related: two areas in southern Sweden (Skaraborg and Skåne) had a significantly higher prevalence of BCV (72.5 and 65.5% respectively); almost the same two areas were identified as being high-prevalence clusters for BRSV (69.2 and 66.8% respectively). An area in south-east Sweden (Kronoberg-Blekinge) had lower prevalences for both infections than expected (23.8 and 20.7% for BCV and BRSV respectively). Another area in middle-west Sweden (Värmland-Dalarna) had also a lower prevalence for BRSV (7.9%). Areas with beef herd density > 10 per 100 km² were found to be at significantly higher risk of being part of high-prevalence clusters.

Conclusion

These results form a basis for further investigations of between-herds dynamics and risk factors for these infections in order to design effective control strategies.     

犊牛呼吸道合胞体病毒和巴氏杆菌混合感染的调查研究

为了对疑似牛呼吸道合胞体病毒和巴氏杆菌混合感染的犊牛进行病原鉴定,本研究采用常规病毒经细菌分离鉴定和PCR方法分别进行分离与鉴定。结果表明,该病毒株能在BT细胞上增殖并产生特征性合胞体形态的细胞病变;无血凝性和血吸附特性;能被牛呼吸道合胞体病毒(bovine respiratory syncytial virus,BRSV)标准阳性血清中和;分离的病毒经RT-PCR鉴定为牛呼吸道合胞体病毒;根据菌落形态、细菌染色特性及生化特性,鉴定分离的细菌为巴氏杆菌。提示,该牛场为牛呼吸道合胞体病毒和巴氏杆菌混合感染。     

牛呼吸道合胞体病毒G蛋白抗原区原核表达及反应原性鉴定

本研究旨在获得重组牛呼吸道合胞体病毒（BRSV） G蛋白并对其进行反应原性鉴定。从NCBI上找出G基因的核苷酸序列,分析其抗原区域,利用Primer Premier 5.0软件设计1对特异性引物,利用RT-PCR方法扩增BRSV G基因片段,将目的片段连接到克隆载体pMD19-T后,对其进行双酶切鉴定和测序。将双酶切后的目的片段进行胶回收,构建重组质粒pET-32a-G,将重组质粒转化大肠杆菌BL21（DE3）感受态细胞,用Ni-IDA亲和层析法纯化经IPTG诱导表达的蛋白,并测定其浓度;通过SDS-PAGE和Western blotting方法对该蛋白进行分析与鉴定。结果显示,本试验成功克隆出大小约为567 bp的G基因,获得分子质量约为40 ku的可溶性重组蛋白,优化诱导条件后用SDS-PAGE对表达产物进行鉴定,在16℃、IPTG浓度1.2 mmol/L、诱导4 h时蛋白表达量最大;通过Western blotting检测发现,重组蛋白可与山羊源BRSV标准阳性血清发生特异性反应,说明该蛋白具有反应原性。综上,本研究成功表达并纯化了BRSV G蛋白,为建立BRSV抗体间接ELISA检测方法和BRSV亚单位疫苗的研制奠定了基础。