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1.
根据GenBank已发表的猪轮状病毒VP7基因保守序列,设计特异性引物扩增猪轮状病毒L1株VP 7全基因序列并进行序列测定及分析。结果显示, L1株猪轮状病毒VP 7基因全长为1062 bp,包含一个982 bp的开放阅读框,编码326个氨基酸,与G5型参考毒株核苷酸同源性和推导的氨基酸同源性分别为88.8%~93.7%和93.3%~94.2%,系统进化树分析结果亦显示L1株与G5型参考毒株处于同一个群,由此确定L1株为G5型。与我国近几年流行的G9型毒株NMTL进行抗原表位分析结果显示,两个毒株在 aa25~aa29、aa86~aa102、aa142~aa152、aa211~aa226、aa263~aa286等区域存在明显差异,可能对其免疫保护性存在一定的影响。  相似文献   

2.
本研究采集湖北省某猪场腹泻发病仔猪的肠道内容物,并对其进行分离与遗传进化分析。将病样接种MA-104细胞,分离获得1株能产生明显细胞病变的病毒,命名为HuB2020。对分离毒株进行多重RT-PCR方法检测,并对分离毒株的VP6和VP7基因进行扩增测序及遗传进化分析。结果表明,HuB2020分离株为猪A群轮状病毒,VP6基因(I5型)与山东分离株DZ-1的同源性最高(97.82%);VP7基因(G9型)与四川分离株SWU-1C的同源性最高(95.51%)。近几年,猪轮状病毒的G9基因型增多,该病有再次流行暴发的潜在威胁。  相似文献   

3.
轮状病毒是引起幼龄动物和儿童病毒性腹泻的主要病原,轮状病毒的分离鉴定为该病的流行病学调查和分子生物学特性研究奠定了基础。本研究采集北京某猪场腹泻发病仔猪肠内容物,将其接种MA104细胞,分离得到一株能产生明显细胞病变的病毒。对分离毒株进行胶体金、实时荧光定量RT-PCR和免疫荧光等方法鉴定,并对分离毒株的VP4、VP6和VP7基因进行测序及序列分析。结果表明,分离毒株为猪A群轮状病毒。按照A群轮状病毒的最新分类方法,确定该分离株VP4、VP6和VP7基因的基因型分别为P[13]型、I5型和G11型。因此,将该分离株命名为Rotavirus A pig/China/BJ/2015/G11P[13]。  相似文献   

4.
根据GenBank中的猪伪狂犬病病毒(PRV)gE、猪圆环病毒2型(PCV-2)ORF2、猪细小病毒(PPV)VP2基因序列,设计了3对引物,成功建立了检测PRV野毒株、PCV-2和PPV的多重PCR诊断方法,扩增产物分别为288 bp、419 bp、681 bp。敏感性、特异性试验结果显示,该PCR对3种病毒的最低核酸检测量分别为PRV 48.2 pg/L、PCV-2 36.7 pg/L、PPV 0.25 ng/L,而PRV(gE基因缺失株)、猪瘟病毒(CSFV)、猪繁殖与呼吸综合征病毒(PRRSV)、大肠杆菌的扩增结果均为阴性。对87份自然感染病猪样品的检测结果表明,该多重PCR检测结果与单一PCR检测结果完全符合。结果表明,该多重PCR方法具有很好的特异性和敏感性,可用于临床PRV野毒株和gE基因缺失疫苗株、PCV-2和PPV的检测。  相似文献   

5.
目前国内对猪轮状病毒的研究较少,作者旨在对猪A群轮状病毒进行分离与鉴定,为后续猪轮状病毒致病机理和分子生物学特性研究奠定基础.用胰蛋白酶处理RT-PCR检测猪A群轮状病毒病原阳性的临床腹泻粪样,然后接种长成单层的MA-104细胞,进行病毒分离传代.再对分离毒株进行常规RT-PCR鉴定和电镜观察,并对分离毒株的VP6、VP7和VP8基因进行测序及序列分析.结果成功分离猪A群轮状病毒TM-a株,经序列同源性分析发现,与TM-a株VP6、VP7和VP8基因同源性最高的毒株分别为中国北京人源LL3354株、印度人源RMC321株和日本野猪源GUB-71株,其相似性为96.0%、95.1%和97.0%.该TM-a株轮状病毒不同基因表现出与人源轮状病毒和猪源轮状病毒的高度同源性,推测猪A群轮状病毒可能在人畜间传播,发生基因重组现象.  相似文献   

6.
2022年8月中旬,湖南永州某猪场暴发仔猪腹泻病例,发病仔猪死亡率较高,常规抗生素治疗基本无效。观察病猪临床症状、病理剖检,并采集肠组织样品进行细菌分离和常见腹泻相关病原分子检测,确定该病由猪流行性腹泻病毒和轮状病毒混合感染引起;进一步扩增并分析PEDV S1和PoRV VP7基因序列发现该场流行的PEDV毒株为变异株,PoRV毒株属于G9型。其后根据诊断结果采取系列防控措施,经过科学防治,该病得到有效控制。  相似文献   

7.
《畜牧与兽医》2016,(9):32-37
将1份经RT-PCR检测猪轮状病毒阳性的临床腹泻粪样感染Vero细胞,连续盲传8代,出现病变,成功分离到1株病毒,经RT-PCR检验和电镜观察,鉴定该病毒为轮状病毒,命名为GD-01-2015。扩增该病毒的VP4和VP7基因进行分型和系统进化分析,结果发现,其VP4基因为P[7]型,与来自韩国的猪源毒株K71同源性达到99.8%;其VP7基因为G5型,与来自韩国的猪源毒株06-6-1同源性达到99.7%。由此可以推测GD-01-2015株与韩国猪源毒株有相似的进化来源。根据轮状病毒分类委员会(RCWG)提出的A群轮状病毒的最新分类方法,GD-01-2015株基因型为G5P[7]。本研究为监测轮状病毒的流行状况及其疫苗的研制提供了理论依据。  相似文献   

8.
将某猪场发病死亡猪的脑和肺组织接种BHK-21细胞,连传5代均出现典型细胞病变,表明分离到1株病毒,病毒含量为108. 33TCID50/mL。该毒株能被猪伪狂犬病病毒标准阳性血清中和,接种家兔、小鼠和仔猪均出现典型伪狂犬病症状,表明分离株为猪伪狂犬病病毒,命名为PRV HB-11株。gC基因的遗传进化分析显示,HB-11株与近年来流行的变异株同源性为99. 3%~99. 4%,与Bartha株的同源性为94. 8%,其gC基因序列相对于Bartha株序列有7个连续氨基酸的插入(158AAASTPA164),该突变插入的生物学意义有待于进一步研究。  相似文献   

9.
猪伪狂犬病病毒的分离鉴定及其gE基因序列分析   总被引:1,自引:0,他引:1  
从福建省某猪场疑似伪狂犬病的发病3日龄仔猪的脑、肺脏中分离到1株病毒.该病毒接种家兔出现了典型的伪狂犬病症状,接种PK-15细胞36 h后出现了圆缩、集聚、脱落等典型的细胞病变,猪伪狂犬病病毒阳性血清能特异性中和该分离病毒.根据已发表的伪狂犬病病毒(PRV)gE基因的序列,设计并合成了一对引物,采用PCR方法可扩增特异性298 bp的DNA片段.测序结果与GenBank中有代表性的6株参考毒株相应基因序列比较,核苷酸和氨基酸序列同源性分别为95.5%~99%和91.8%~98%.系统进化树结果表明分离株与湖北分离株Ea株亲缘关系最近.  相似文献   

10.
《畜牧与兽医》2016,(12):36-41
从安徽六安某爆发伪狂犬病猪场送检的流产仔猪脑组织样品中分离获得1株病毒,经鉴定为伪狂犬病毒(pseudorabies virus,PRV),命名为PRV AH02LA株。PRV AH02LA株的糖蛋白g D和g I基因序列与2011年以来我国分离的变异株同源性最高(99.5%~100%),而与其他毒株同源性低。该分离株在BHK21细胞上增殖能力强,最高滴度达到109.0TCID50/m L。该分离株对4~5周龄和9~10周龄的PRV阴性猪能引起100%发病和死亡。临床上4~5周龄猪有严重的神经症状,也有明显的呼吸道症状;而9~10周龄猪主要表现呼吸道症状。说明本研究分离获得的PRV AH02LA是一株伪狂犬病毒变异株,其对仔猪的致病力较强。  相似文献   

11.
Faecal samples from 96 piglets with acute gastroenteritis and 41 samples from non-diarrhoeic piglets were investigated for porcine rotavirus (PRV) antigens by enzyme-linked immunosorbent assay (ELISA). PRV was detected in 43 of 96 (44.8%) in the diarrhoeic group whilst none of the samples in the non-diarrhoeic group was positive for PRV (P less than 0.01). Age distribution of infection showed a higher infection rate of 30.2% in piglets aged 1-3 weeks, which was significantly higher (P less than 0.05) than in piglets aged 4-6 weeks, where the infection rate was 14.6 per cent. No PRV antigen was detected in diarrhoeic piglets above 6 weeks of age. Titration of 10 randomly selected ELISA-positive samples showed titres ranging from 512 to greater than or equal to 4.096.  相似文献   

12.
猪病毒性腹泻三联疫苗的免疫研究   总被引:5,自引:1,他引:5  
用猪传染性胃肠炎病毒、猪流行性腹泻病毒、猪轮状病毒制备的三联疫苗对8头怀孕母猪进行免疫,所产73头仔猪保护率89%;对110头仔猪进行口服免疫,21天用三种强毒混合毒攻击,免疫组保护92.7%,对照组发病84.8%,经测定疫苗免疫期为4个月,干燥阴凉条件下保存期为12个月。田间受免仔猪2744头,免疫保护90%。  相似文献   

13.
猪圆环病毒2型原位杂交检测技术的建立与应用   总被引:5,自引:0,他引:5  
参照GenBank发表的猪圆环病毒2型(PCV2)ORF2基因序列设计引物,利用PCR扩增得到PCV2BF株341bp的核酸片段,用随机引物法制备出地高辛标记的核酸探针。制备的探针与PCV1、PRRSV、PPV、PRV等不发生反应,可检测的最低PCV2DNA含量为1.78Pg。对30份临床组织样本进行了检测,并与PCR比较,结果表明,阴性符合率为100%,阳性符合率为88.9%。应用原位杂交技术分析了PCV2在人工感染仔猪主要组织中的分布,结果表明,感染后3d,从仔猪的淋巴结、胸腺、肺脏、脾脏、鼻黏膜可检测到阳性信号,感染后21d,肝脏、肾脏、胰腺和回肠可检出阳性信号,至感染后42d,可从心脏、胃、脑检出阳性信号。在整个试验过程中会厌软骨、膀胱、皮肤、肌肉等组织均为阴性。本研究结果表明,建立的PCV2原位杂交技术具有良好的敏感性和特异性,可用于PCV2的实验室诊断和感染靶细胞的定位分析。  相似文献   

14.
为了解猪伪狂犬病病毒(Pseudorabies virus,PRV)野毒株的特点,本研究对沈阳某养殖场疑似感染PRV的组织病料进行PCR鉴定、病毒分离和纯化、gD、gE基因序列测定及分析、动物回归实验。结果显示:分离株能在ST细胞中产生典型的细胞病变,且PCR显示为PRV阳性;通过gD、gE基因进行序列分析发现,分离株与2011年后分离的PRV变异株位于同一进化分支;氨基酸位点分析发现分离株与PRV变异株具有相同的变异模式。进一步研究其致病性,将纯化后的病毒液接种PRV抗体阴性21日龄健康仔猪,感染仔猪出现典型的PR症状,如呼吸困难、转圈、流涎和划水动作,且在试验期内仔猪全部发病(5/5),其中4头死亡(4/5)。综上,本研究成功分离到一株PRV变异株,将其命名为HP-SY2022。这一研究为丰富我国PRV分子流行病学及后续的免疫防控提供了参考。  相似文献   

15.
Eight strains of rotaviruses isolated from diarrheal animals (4 from calves and 4 from piglets) in China were compared by serotyping with reference animal rotavirus strains (bovine NCDV, porcine OSU and simian SA-11 and human rotavirus Wa strain). Two-way cross neutralization test showed no antigenic difference between all 4 local strains of bovine rotavirus (BRV007, BRV014, HN-7 and BRV6555) and reference NCDV, so they belonged to rotavirus serotype 6 (bovine rotavirus serotype 1 or NCDV-serotype). Meanwhile, the four strains of Chinese porcine rotavirus could be determined into 2 different serotypes. One (Li99) was neutralised to a high titer with the antiserum against reference OSU virus and probably related to OSU (serotype 5 or porcine serotype 1). The other three strains (Lin71, Nan86 and Jiang150) were antigenically obviously different from Li99 and did not react with the antiserum against OSU. They were tentatively considered as porcine rotavirus serotype 2. All the strains of bovine and porcine rotavirus did not cross-neutralise with simian SA-11 and human Wa strain. There was also no antigenic relationship between bovine rotaviruses and porcine rotaviruses.  相似文献   

16.
Detection and survival of group A rotavirus in a piggery   总被引:1,自引:0,他引:1  
Samples of dust, faeces and effluent were collected from a piggery and examined for group A rotavirus, using a commercial ELISA test, electron microscopy and inoculation of MA-104 cells. Rotavirus antigen was demonstrated in samples collected from farrowing and weaner rooms but not from fattener and sow houses. Rotavirus antigen was also detected in samples collected from a weaner room which had been free of piglets for three months. A cytopathic porcine rotavirus (British isolate SW20/21) was kept at room temperature for four months; it survived with titres reduced by 2 log10. These observations suggest that the environment of commercial piggeries is an important source of rotaviral infection for young piglets.  相似文献   

17.
To understand the pathogenic causes of weaning diarrhea in Yunnan province,we collected 210 feces and 60 drinking water,a total of 270 samples in 30 farms with weaning diarrhea and analyzed the virus and pathogenic bacteria.The results of the study showed that drinking water was sever polluted by pathogenic Escherichia coli,40 strains of pathogenic Escherichia coli were detected in drinking water,the positive rate was 66.7%,and 100 strains in feces with positive rate of 47.6%;10 strains of pathogenic Salmonella were detected in drinking water,the positive rate was 16.7%,and 24 strains in feces with positive rate of 11.4%,and were sensitive to imipenem.PCR amplified positive rates of porcine epidemic diarrhea virus (PEDV),porcine circovirous type 2 (PCV2),pseudorabies virus (PRV),classical swine fever virus (CSFV),porcine reproductive and respiratory syndrome virus (PRRSV) and porcine rotavirus (PoRV) in feces were 5.2% to 13.0%,and they were not detected in drinking water.By analyzing the causes of diarrhea in Yunnan province in weaned piglets analysis,understanding the specific causes of diarrhea in weaned piglets,the results provided a more reasonable and more realistic theoretical basis and experimental reference for prevention and control of the disease from the cause.  相似文献   

18.
为了解湖南省近年来伪狂犬病病毒(PRV)的分子流行病学情况,更好地控制伪狂犬病,2012-2014年从湖南平江、汨罗、浏阳、长沙4地的4个规模化猪场送检的病料(脑组织)中检测到PRV野毒。将脑组织接种PK-15细胞,经PCR和动物接种鉴定为PRV。4个毒株分别命名为PRV-XiangA、PRV-GA、PRV-YY和PRV-LY。对这4株PRV的免疫(gB、gG、gH、gI、gL、gM)与毒力(gE、PK、TK)相关基因进行序列分析,结果显示这4株PRV的免疫与毒力相关基因核苷酸同源性为99.8%~100.0%,说明分离得到的4株PRV变异极小;将这4株PRV与国内外的主要毒株进行序列比对,结果表明这4株PRV与国内的分离毒株同源性很高,与BJ-YT株和TJ株的亲缘关系最近,核苷酸同源性为99.8%~100.0%,说明当前国内流行的PRV毒株变异较小。  相似文献   

19.
为了解云南省断奶仔猪腹泻的致病性原因,通过对30个发生断奶仔猪腹泻猪场的210份粪便、60份饮用水,总计270份样品,进行病毒及致病性细菌分析。研究结果表明,致病性大肠杆菌严重污染饮用水,致病性大肠杆菌在饮用水中检出40株,阳性率为66.7%,粪便中检出100株,阳性率47.6%;致病性沙门氏菌在饮用水中检出10株,阳性率为16.7%,粪便中检出24株,阳性率为11.4%,均对亚胺培南敏感。在粪便中猪流行性腹泻病毒(porcine epidemic diarrhea virus,PEDV)、猪圆环病毒2型(porcine circovirous type 2,PCV2)、猪伪狂犬病病毒(pseudorabies virus,PRV)、猪瘟病毒(classical swine fever virus,CSFV)、猪繁殖与呼吸综合征病毒(porcine reproductive and respiratory syndrome virus,PRRSV)及猪轮状病毒(porcine rotavirus,PoRV)的PCR扩增阳性率为5.2%~13.0%,在饮用水中未检出。通过对云南省断奶仔猪腹泻进行病因分析,了解断奶仔猪腹泻的具体原因,本试验结果为从病因入手防制该病提供更合理、更切合实际情况的理论依据与试验参考。  相似文献   

20.
To investigate molecular epidemiology of pseudorabies virus(PRV) in recent years in Hunan province and control pseudorabies more better, four wild-type PRV strains were detected from porcine brain tissues, which were collected from four farms of Pingjiang, Miluo, Liuyang and Changsha in Hunan province during 2012-2014.The four PRV strains were isolated by inoculating porcine brain tissues to the PK-15 cells, identified by PCR test and animal inoculation, and named PRV-XiangA, PRV-GA, PRV-YY and PRV-LY, respectively.The results showed the nucleotide homology among the four strains was 99.8% to 100.0%, by aligning the immune(gB, gG, gH, gI, gL and gM) and virulence genes(gE, PK and TK) of the four PRV strains, which indicated that these strains displayed almost no differences.The results of nucleotide alignment between the four strains and main strains isolated at home and abroad showed that the four strains had a high homology with PRV main strains isolated from China, with displaying nucleotide identity of 99.8% to 100.0% to BJ-YT and TJ strains, which revealed that the epidemic PRV strains in China had a little variation currently.  相似文献   

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