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《畜牧与兽医》2021,(7)
鹅星状病毒(goose astrovirus, GAstV)是引起当前雏鹅痛风疾病的主要病原体,其流行严重影响养鹅产业的健康发展。为研究鹅星状病毒在河南地区的流行情况,本研究于2018年从河南12个地市的养鹅场采集了36份雏鹅痛风样品,采用RT-PCR方法进行检测,并对12个地市代表毒株的ORF1b基因进行了序列测定、同源性分析和系统进化分析。研究结果表明,36份样品均为阳性,阳性率为100%;12个地市代表毒株的ORF1b序列长度均为1 551 bp,各自间的核苷酸同源性为98.7%～99.9%,与河南地区的XX、AstV/HN01/Goose/0103/18、AstV/HB01/Goose/0123/19、AstV/AH01/Goose/0512/18等代表毒株核苷酸同源性为97.9%～99.5%,与国内其他地区的GD、AstV/SDPY/Goose/1116/17、AAstV/Goose/CHN/2017/SD01等代表毒株核苷酸同源性为98.4%～99.7%;系统进化分析显示,12个地市代表毒株与河南及国内其他地区代表毒株,在进化关系上处于同一分支,属于禽星状病毒1群。本研究明确了河南地区鹅星状病毒的分子流行情况,并为鹅痛风病的防治提供了线索和思路。 相似文献
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为了解广西地区水牛感染中肠道病毒(BEV)的情况，本研究在广西南宁某水牛规模养殖场腹泻粪便样品中成功分离出2株BEV,分别命名为GXNN2106和GXNN2102。将2株病毒空斑纯化后测定GXNN2106毒株TCID50为107.99/0.1 mL,GXNN2102毒株TCID50为107.37/0.1 mL。多步生长曲线结果显示，GXNN2106毒株在MDBK细胞中复制增殖良好。经BEV VP1、5′UTR特异性引物逆转录聚合酶链反应(RT-PCR)鉴定，2株病毒均属于E2型，与其他E2型BEV 5′UTR核苷酸同源性为75.7%～78.6%,VP1核苷酸同源性为87.1%～91.1%。本研究首次在广西地区水牛粪便中分离得到E2型BEV毒株，为广西水牛源牛肠道病毒的流行分布情况和疫苗的研发提供数据支持。 相似文献
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《中国兽医学报》2016,(12):2009-2013
为了解福建地区2013—2014年猪瘟病毒(CSFV)流行毒株的分子生物学特性与变异规律,采集了福建地区多个猪场的40份疑似猪瘟样品,应用RT-PCR技术对E2基因的主要抗原编码区进行扩增及序列分析,其中31份为猪瘟阳性。序列分析结果表明,31株CSFV流行毒株之间核苷酸与氨基酸的同源性分别为78.5%~100.0%和82.2%~100.0%,与国内外分离株的核苷酸同源性为81.1%~98.9%,氨基酸同源性为79.8%~95.6%;遗传进化树分析表明,31株CSFV属于1.1和2.1亚群,其中23株为1.1亚型,8株为2.1b和2.1c亚群,没有发现2.2和2.3亚群毒株。氨基酸序列分析表明,流行株在免疫逃逸相关位点705,713,729和734位氨基酸发生变异,FJ02毒株B细胞表位关键位点771位氨基酸发生变异,表明福建地区CSFV流行毒株呈现遗传变异多样性。 相似文献
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为了解广东省猪繁殖与呼吸综合征病毒(PRRSV)流行毒株ORF5基因遗传变异情况,采用RT-PCR对2018年采自广东部分地区疑似患有PRRS的猪肺组织样品进行PRRSV ORF5基因扩增以及克隆测序,并进行生物信息学分析。结果表明,成功扩增出18株PRRSV流行毒株的ORF5基因片段。ORF5基因序列分析表明,18株PRRSV流行毒株ORF5基因核苷酸同源性为83.7%~99.8%,PRRSV流行毒株与参考毒株的同源性为62.1%~99.8%。基于ORF5基因的遗传进化树分析表明,18株PRRSV流行株均为美洲型毒株。其中,10株与以JXA1为代表的高致病性毒株亲缘较近,2株与新型高致病性毒株FZ16A相似;1株与以NT1为代表的疫苗返强毒株亲缘较近,1株与以R98为代表的疫苗毒株亲缘性较近,4株与广东新报道的GM2和QYYZ毒株亲缘性较近。DNA推导氨基酸序列分析表明,18株流行株的氨基酸序列与国内已报道的代表株相比发生不同程度的变异,GP5抗原表位上存在着差异。研究结果揭示了广东地区PRRSV有新型强毒株、重组毒株以及疫苗返强毒株的流行,提示养殖者谨慎、合理使用疫苗,防止疫苗毒株返强和毒株重组,为该地区防控PRRS提供参考。 相似文献
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为了解禽白血病病毒在广西鸡群中流行情况,采用DF-1细胞接种、细胞培养上清p27抗原检测、PCR扩增,对临床血管瘤型禽白血病的三黄鸡病料进行了病毒分离,并对分离病毒gp85基因进行测序和序列比较。结果表明,从1只病鸡同时分离到了一株A亚群禽白血病病毒(ALV-A)与一株J亚群禽白血病病毒(ALV-J),分别命名为HG01-A株和HG01-J株。ALV-A gp85与7株A亚群氨基酸同源性为85.8%~87.5%,与A亚群美国株MQNCSU同源性最高为87.5%,与A亚群原型株RSA同源性为86.9%。而ALV-J gp85与7株毒株核酸序列同源性为84.0%~93.8%,与广东株XX2-08以及四川株SCSM01同源性最高为93.8%,与英国原型株HPRS103同源性为90.2%。进化分析进一步表明,HG01-A与各参考株亲缘关系较远,HG01-J与SCSM01亲缘关系最近。本研究首次从同一只广西三黄鸡中同时分离到ALV-A及ALV-J,进一步完善了我国地方品种鸡群中禽白血病的流行病学信息。 相似文献
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《中国兽医学报》2020,(3)
根据GenBank上已发表的PCV3毒株序列设计1对检测引物和2对扩增全长引物。应用检测引物对广西地区的犬血清样品进行PCR检测,应用扩增全长引物对检测阳性样品进行PCR扩增、克隆和测序,并对其全基因序列进行分析,绘制遗传进化树。结果显示,广西地区147份犬血清样品中,阳性样品为36份,感染率为24.3%。本试验成功扩增1株2 000 bp的PCV3毒株的全基因核苷酸序列,并命名为PCV3/Guangxi-5。将PCV3/Guangxi-5序列与NCBI公布的PCV3的参考序列进行同源性比对,结果显示PCV3/Guangxi-5与参考序列的全基因序列同源性为98.9%～100.0%,其中与DE27.16同源性最低,与PCV3/CN/Chongqing-148/2016同源性最高。应用MEGA7.0对PCV3进行ORF2基因的氨基酸序列进行比对发现,第24位至第27位氨基酸存在6种形式,分别为VRRK、ARRR、ARKR、LRRK、VRRR和ARRK。利用MEGA7.0软件中Maximum Likelihood (ML)法p-distance模式构建基于ORF2基因和PCV3全基因的系统发育分析表明,PCV3可分为PCV3a和PCV3b等2种基因型,本试验获得的PCV3/Guangxi-5为PCV3a亚型,其ORF2基因与PCV3/CN/Liaoning-23/2016亲缘关系最近,与NWHEB21、毒株亲缘关系相距最远;其全基因组与CN/Jiangxi-62/2016毒株亲缘关系最近,与CNFJ-1毒株亲缘性最远。结果表明,广西地区犬群普遍存在感染PCV3的情况,理论上丰富了广西地区PCV3的流行病学资料,为PCV3的防治措施的制定和流行病学研究提供一定的参考依据。 相似文献
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为了解禽白血病病毒在商品蛋鸡中的流行情况,试验采用病理剖检、聚合酶链式反应(PCR)以及间接免疫荧光试验(IFA)等方法对送检的疑似禽白血病病毒感染的商品蛋鸡进行了病毒分离与鉴定,并对分离株的致瘤相关基因gp85基因进行测序,与国内外各亚群禽白血病病毒进行对比。结果表明:分离、鉴定到1株J亚群血管瘤禽白血病病毒,命名为FJ0610;分离株gp85基因核苷酸序列同源性在11.5%～94.5%之间,其中与血管瘤禽白血病毒株ZH-08株同源性最高,而与E亚群毒株同源性最低;基于gp85核苷酸序列的系统进化分析表明FJ0610株的gp85序列与ZH-08株的亲缘关系最近。 相似文献
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《中国兽医学报》2019,(9):1703-1709
为了解阿卡斑病毒在云南师宗的流行情况及病毒的遗传特征,本研究在云南师宗设立哨兵动物,2014年5～11月每周1次连续采集血清、血液样品,血清用做AKAV抗体检测,血液在C6/36、BHK-21、MDBK和Vero细胞上进行病毒分离工作,用S基因特异引物对阳性分离物进行鉴定及序列分析。结果显示,15头哨兵动物共采集到28批420份血清、420份血液样品,其中有3头牛和1只羊感染AKAV,从这些样品中分离获得2株AKAV(编号09312D和09312H),它们在BHK-21和MDBK细胞上48 h产生明显CPE。2株新分离AKAV的S片段序列核苷酸同源性为100%,氨基酸同源性为100%,与所引用的9株其他不同地区分离的AKAV的S片段序列核苷酸同源性在83.8%～97.7%之间,氨基酸同源性在90.6%～99.6%之间,且新分离毒株处于同一进化小分支,具有高度亲缘性,形成了一个独立的次级分支,同时与其他2株中国AKAV分离株处于同一进化簇。结果表明,云南省师宗县为AKAV流行地区,病毒在当地活动频繁,新分离得到的2株病毒与其他AKAV毒株具有较高的核苷酸同源性和氨基酸同源性,提示亚洲太平洋地区AKAV病毒长期流行且关系密切,同时其氨基酸同源性高于核苷酸同源性也提示了AKAV S片段良好的氨基酸遗传稳定性。 相似文献
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为了解猪圆环病毒3型(porcine circovirus type 3,PCV3)在吉林省的流行情况和分子生物学特性,本研究通过PCR方法对吉林省2015-2017年的484份血清样品进行PCV3检测,将PCV3检测阳性的样品进行ORF2基因扩增和测序,并利用生物信息学软件DNAStar和Mega 6.06对ORF2基因的分子生物学特性进行分析。结果显示,吉林省2015-2017年PCV3样品总感染率和猪场感染率分别为28.1%(136/484)和65.8%(25/38),且呈逐年上升趋势。同源性分析结果表明,本研究获得的4株PCV3 ORF2基因的核苷酸和氨基酸序列同源性分别为98.3%～98.9%和97.7%～99.5%,4株PCV3 ORF2基因与国内外参考毒株ORF2基因的核苷酸和氨基酸序列同源性分别为97.7%～99.7%和96.7%～100%。遗传进化分析表明,PCV3存在2个亚群:PCV3a和PCV3b。本试验分离的PCV3毒株分别位于2个亚群上,1株属于PCV3a亚群,3株属于PCV3b亚群。PCV3毒株Cap蛋白第24(A、V)和27位(R、K)氨基酸的不同可能与PCV3毒株的进化相关。本试验结果表明,PCV3在吉林省猪群和猪场中存在很高的感染率,PCV3毒株之间高度保守,本研究结果为PCV3的分子特性研究提供了参考依据。 相似文献
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This study was aimed to investigate the prevalence of bovine astrovirus (BoAstV) in buffalo from Guangxi,a total of 297 fecal samples were collected from 15 different scale buffalo farms in five regions including Nanning,Guigang,Beihai,Hengxian and Lingshan in Guangxi,the RNA was extracted by Trizol and the nest RT-PCR was used to detect the BoAstV.The positive samples were connected to pMD18-T vector for sequencing.Homology analysis of sequencing results was carried out,and phylogenetic tree was constructed.The results showed that the positive rate of BoAstV in buffalo farms was 40.00% (6/15),the positive rate of samples was 11.11% (33/297), and the buffalo calves which under 180 days old were more sensitve to infected BoAstV 18.75% (27/144).Total 19 BoAstV ORF1b sequences from positive samples were cloned and uploaded to NCBI BLAST.The nucleotide homology and amino acid sequence homology of the 19 BoAstV strains were 53.9% to 99.3% and 12.1% to 98.5%,respectively.Based on the phylogenetic analysis of these sequences and reference sequences,4 clusters could be classified.The first subgroup included NNC-286,HX-3,HX-4 and NNA-14,and these sequences were closed with novel nervous tropism BoAstV like BoAstV NeuroS1 and BoAstV BH89/14 which belonged with Mamastrovirus 13.The second subgroup included NNA-12,NNA-13,NNA-17 and NNA-11,and these sequences were closed with buffalo astrovirus,and belonged to the branch of buffalo astrovirus.The third subgroup included HX-1,HX-5,HX-6 and BH-C22,and these sequences were closed with classic BoAstV like BoAstV B170-HK.The last subgroup included NNA-7,NNA-15,NNA-6,NND-S2,NND-S16,NNC-296 and BH-C14,and these sequences were closely related to the local endemic strains of bovine stellavirus in Guangxi.The different genotype of BoAstV were infected buffalo herds in different regions from Guangxi.This study found that the neurophilic BoAstV strain infected buffalo in Guangxi,and provided reference for further understanding of the epidemiology and biological characteristics of the virus. 相似文献
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Niyokwishimira ALFRED Huan LIU Mu Lan LI Shao Feng HONG Hai Bo TANG Zu Zhang WEI Ying CHEN Fa Kai LI Yi Zhi ZHONG Wei Jian HUANG 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(6):643-651
Astroviruses are the principal causative agents of gastroenteritis in humans and have
been associated with diarrhea in other mammals as well as birds. However, astroviral
infection of animals had been poorly studied. In the present study, 211 rectal swabs
collected from cattle and water buffalo calves with mild to severe diarrhea were tested
for bovine astrovirus (BAstV) by RT-PCR. Results: 92/211 (43.6%) samples were positive for
BAstV, at a rate of 46.10% (71/154) in cattle and 36.84% (21/57) in water buffalo.
Phylogenetic analysis based on the partial and full-length of 25 ORF2 amino acid sequences
obtained in this study classified the Guangxi BAstVs isolates into five subgroups under
the genus of Mamastrovirus, genotype MAstV33, which
suggested that the water buffalo was a new host of this genogroup that previously included
only cattle and roe deer. Despite the origin of the host, the Guangxi BAstV isolates were
closely related to the BAstV Hong Kong isolates (B18/HK and B76-2/HK), but highly
divergent from the BAstV NeuroS1 isolate previously associated with neurologic disease in
cattle in the U.S.A. Nucleotide sequence-based characterization of the ORF1b/ORF2 junction
and corresponding overlapping regions showed distinctive properties, which may be common
to BAstVs. Our results suggested that cattle and water buffalo are prone to infection of
closely related astroviruses, which probably evolved from the same ancestor. The current
study described astroviruses in water buffalo for the first time and is thus far among the
largest epidemiological investigations of BAstV infection in cattle conducted in
China. 相似文献
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为了解猪繁殖与呼吸综合征病毒（PRRSV）在湖南省地方猪保种场的感染情况,本研究在2019－2020年间从湖南省2个地方猪保种场采集287份全血样品。首先将血样混合成41份,采用RT-PCR或PCR法进行PRRSV病原检测,进一步通过高保真PCR扩增从PRRSV阳性样品中扩增PRRSV ORF5基因;测序后利用DNAStar软件分析获得的ORF5基因及其编码的GP5氨基酸与国内外不同PRRSV毒株的遗传进化关系;最后用PRRSV阳性血清接种Marc-145细胞,经盲传分离毒株,并用Reed-Muench法测定病毒滴度。结果显示,检测的41份混样中有3份PRRSV病原核酸呈阳性;从PRRSV阳性混样中单独扩增获得6条PRRSV ORF5基因序列,均属于PRRSV-2型的lineage 8分支,相似性为99.2%~99.8%;6条ORF5基因编码的GP5蛋白氨基酸序列在信号肽区域（第23位）、潜在的N-糖基化位点（第33位）和表位C （第59位）存在差异;PRRSV阳性血清接种Marc-145细胞盲传5代后出现明显的细胞病变,获得1株PRRSV毒株,命名为NX-1,病毒TCID50为4×105/mL。本研究表明,湖南省地方猪保种场存在PRRSV感染,感染的PRRSV属于PRRSV-2型的lineage 8,其GP5氨基酸序列存在的多处变异可能是造成疫苗免疫失败的原因之一,以上结果可为湖南省地方猪保种场的免疫防控提供一定参考。 相似文献
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水牛乳是中国南方地区重要奶源，为了解中国广西地区水牛乳中微量元素含量及不同因素如地域、品种和泌乳期对水牛乳中微量元素含量的影响，于广西南宁市兴宁区、邕宁区和钦州市灵山县共3个水牛场采集了摩拉、尼里2个品种，3个泌乳时期的水牛乳样品共60份，通过微波消解，利用电感耦合等离子体质谱检测了铬（Cr）、锰（Mn）、钴（Co）、铜（Cu）、砷（As）、硒（Se）、铯（Cs）、钡（Ba）、钼（Mo）、铅（Pb）、镉（Cd）、镍（Ni）共12种微量元素的含量，采用皮尔逊相关分析解析了12种元素含量之间的相关性，采用单因素方差分析比较了不同地域、品种和泌乳期水牛乳之间微量元素含量差异，采用多因素方差分析解析交互作用对元素含量的影响。结果表明，该法测定水牛乳12种微量元素含量的加标回收率在84.94%~120.91%之间。不同地域间水牛乳中Mn、Se、Cs、Ni含量差异显著（P<0.05），钦州市灵山县水牛乳中Mn、Cs含量较高，南宁市兴宁区水牛乳中Se、Ni含量较高；不同品种间水牛乳中Se、Ni含量差异显著（P<0.05），尼里水牛乳中Se、Ni含量高于摩拉水牛；不同泌乳期水牛乳中Mn、Co、Cu、Se、Mo含量差异显著（P<0.05），初乳中Co、Cu、Se含量较高，常乳中Mn含量较高，晚乳中Mo含量较高；地域与品种的交互作用对水牛乳中微量元素含量无显著影响。 相似文献
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We investigated the prevalence of Shiga toxin-producing Escherichia coli (STEC) in 568 healthy domestic animals (buffaloes, cattle, and goats) from 98 farms in the central region of Vietnam. The aims of this study were to determine if the prevalence of STEC in South East Asia is similar to that in other parts of the world, to characterize the virulence gene profiles from the recovered STEC and to determine if the recovered STEC belong to serotypes commonly associated with human disease. STEC and intimin-positive strains were recovered from 27% of buffaloes, 23% of cattle, and 38.5% of goats. Seventy percent of buffalo farms, 60% of cattle farms and 100% goat farms were positive for STEC. Of 170 STEC strains, 99 carried both stx1 and stx2 genes, 36 carried the stx2 gene, and 35 carried the stx1 gene. The eae gene was found in six caprine isolates, but not in buffalo or bovine isolates. Among 173 E. coli strains (170 STEC and 3 intimin-positive), 110 carried the ehxA gene, 106 possessed the saa gene. Further characterization of stx subtypes demonstrated that among 134 stx1-containing isolates, 107 belonged to the stx1c subtype and 27 were the stx1 subtype. Of the 132 stx2-containing isolates, 36 were stx2, 34 were stx2c, 43 were stx2d subtype, 3 belonged to stx2g, and 16 strains were stx2d(act). The stx2c variant was dominant in strains isolated from buffalo while the stx2d variant occurred more frequently in caprine isolates. Only 9 (5%) STEC strains contained genes encoding for serotypes O26, O91, O121, O145, and O157 LPS, which are more frequently associated with human infections. The results of this study provide data for understanding of epidemiology of STEC among domestic animals in Vietnam and indicate that buffaloes are also an important reservoir of STEC. 相似文献
19.
本研究旨在了解引起仔猪腹泻的主要病毒性病原感染情况及流行特点,为有效防控广西仔猪腹泻提供科学依据。试验采用RT-PCR/PCR检测方法对2016年3月至2019年2月广西14个地级市366个规模猪场送检的914份仔猪腹泻病料样品进行猪流行性腹泻病毒（PEDV）、猪轮状病毒（PoRV）、猪传染性胃肠炎病毒（TGEV）、猪Delta冠状病毒（PDCoV）、猪瘟病毒（CSFV）、猪繁殖与呼吸综合征病毒（PRRSV）、猪圆环病毒2型（PCV2）和猪伪狂犬病病毒（PRV）检测,并分析其阳性率在不同年份、季节、地区之间的差异及病原混合感染情况。调查结果显示,PEDV、PDCoV、PRRSV、PoRV、PCV2、CSFV、PRV均存在不同程度的感染,其样品平均阳性率分别为59.74%、8.32%、7.77%、4.92%、3.72%、3.28%和2.08%,未检测出TGEV;PEDV已无明显季节性,一年四季均高发,即使在炎热的夏季,在感染猪群中也持续存在,PDCoV有明显的季节性,多发生在冬春寒冷季节;广西仔猪腹泻PEDV阳性率高,单一感染高达50.55%,仔猪腹泻混合感染情况也较多,其中以二重感染情况较为常见,同时也存在四重感染现象。结果表明,广西腹泻仔猪存在7种病毒性病原不同程度感染情况,其中以PEDV导致的仔猪病毒性腹泻尤为严重,新发PDCoV阳性率仅次于PEDV,需重视并加强对新发PDCoV的防控。 相似文献
20.
YAN Xiukui HAN Zhixiao DU Qian WANG Wei ZHU Yuanzhi XIN Jialiang YI Chizhe BI Jingshan SUN Wenchao ZHENG Min 《中国畜牧兽医》2007,47(10):3069-3077
The aim of this study was to investigate the prevalence of canine circovirus (CCV) in Chongqing in recent years,and to explore the characteristics of the field strains in Chongqing.In this study,100 dog serum samples collected in Chongqing in 2017 were tested for CCV nucleic acid by PCR,and the obtained CCV positive samples were amplified and sequenced with the full length genome,and the Chongqing CCV strain isolated was analyzed by MegAlign,Mega 6.0 and RDP4 software.Four positive sample were found,with a positive rate of 4%,and three full length CCV genomes (CQ76,CQ79,and CQ82) were obtained,with a total length of 2 062 nt.Compared with the previously reported genome of CCV with a length of 2 063 nt,one base was missing,which was located downstream of the stem ring structure in the 5'-intergenic region.The length of the 5'-intergenic region and 3'-intergenic region between the two ORFs of the three strains were 134 (1 929-2 062 nt) and 203 nt (913-1 115 nt),respectively.The homology of CQ76,CQ79,and CQ82 ranged from 99.8% to 100%,among which,CQ76 and CQ82 only had synonymous mutations at the 2 019 locus.The homology of genome sequences of the three Chongqing strains and other strains was 82.7% to 97.1%,among which,the degree of variation of ORF2 was greater than that of ORF1.Based on virus ORF2 sequences and genome-wide respectively build Neighbor-Joining in the evolutionary tree,CQ76,CQ79 and CQ82 all belonged to the same subgroup,which was close to the Chinese strain 204,which belonged to genotype Ⅱ,and the homology was 96.5% to 96.7%.RDP4 recombinant analysis indicated that the genomes of CQ76,CQ79 and CQ82 strains were all the recombinant sequences of 204 and 388 strains from Guangxi,and the recombinant region was located in ORF2.Above results enriched the epidemiological and genetic evolution information of CCV and provided further basic data for prevention and control research. 相似文献