猪细小病毒病的诊治措施

1流行病学特点 猪是已知的唯一易感细小病毒的动物，不同年龄、性别的家猪和野猪都可感染。病猪和带毒猪是主要传染源，猪细小病毒抗体阳性的猪中有30％。50％是带毒猪，不同品系猪含细小病毒的特异性抗体不同。牛、绵羊、猫、豚鼠、小鼠和大鼠中均能检测到猪细小病毒的特异性抗体，来自病猪场的鼠类，其抗体阳性率高于阴性猪场的鼠类；兔感染后可导致流产、死产，这表明猪细小病毒的宿主范围在扩大，感染谱也逐渐加宽。     

湖北省猪细小病毒感染血清学调查报告

采用微量血凝抑制试验对湖北省七个地区62个猪场进行了猪细小病毒感染的血清抗体检查，在1086价猪血清中检出阳性猪726份，阳性率66．86％。在检查不同月龄猪群感染猪细小病毒的血清中，发现1－3月龄的阳性率为54．55％，4－6月龄的阳性率为47．50％，7－8月龄的阳性年为1810％，成年种猪的阳性率为82．23％．证实了猪细小病毒感染的普遍性和不同月龄猪鲜血清抗体的阳性率也不同。     

会泽县猪细小病毒感染的血清学调查

为了解会泽县猪细小病毒（PPV）感染的情况,从县内规模化猪场及散养户中采集了245份猪血清,采用ELISA方法对血清样本进行细小病毒抗体检测。结果显示：245份血清中抗体阳性率为66．12％,表明会泽县猪群中细小病毒已经普遍流行,应引起关注。     

猪细小病毒感染的诊治

猪细小病毒感染又称猪繁殖障碍病，主要危害繁殖母猪，以初产母猪产出死胎、畸形胎、木乃伊胎或病弱仔猪为主要特征。本病病原为猪细小病毒（PPV），属于细小病毒科细小病毒属，病毒对外界环境抵抗力很强，并具有血凝活性，对养猪业危害很大。     

猪细小病毒病的防治

正猪细小病毒病是由猪细小病毒(PPV)引起的以母猪繁殖障碍为主要特征的一种传染病。通常以母猪不孕、流产、产死胎、木乃伊胎和初生仔猪死亡为特征。目前该病在我国各地猪群中广泛分布,严重危害养猪业的健康发展。笔者根据自己多年的防治实践,结合相关理论,对猪细小病毒病的防治技术与大家共同探讨。1病原猪细小病毒属细小病毒科的细小病毒属。病毒粒     

猪细小病毒Z株NS部分基因的扩增及序列分析

从猪细小病毒Z株提取基因组DNA，利用PCR扩增部分基因，并对该扩增片段进行测序与分析。结果表明，扩增的NS基因长330bp，编码109个氨基酸。氨基酸序列中含有猪细小病毒的重要保守序列。并有1个潜在的糖基化位点NFSN。Z株NS基因与其他猪细小病毒Kresse、NADL2-2、NADL2-1株的核苷酸同源性分别为99％、98％、98％，氨基酸同源性均为99％。     

猪细小病毒病及研究进展

猪细小病毒（简称ＰＰＶ）是引起猪繁殖障碍的病原体之一，主要引起母猪的繁殖障碍，以胎儿感染死亡，产出死胎，木乃伊化胎，畸形胎和不孕为主要症状，而母猪本身并不表现临床症状，其他猪感染后也无明显的临床症状。猪细小病毒是Ｍａｙｒ和 Ｍａｈｅａｌ于 １９６６年首次发现，并证实了其病原作用。此后许多国家相继分离到该病毒，我国于１９８２年由中监所成功分离到该病毒，虽然各地所分离的ＰＰＶ来源不同，名称各异，但均是同一型，血清学上无差别。目前在我国该病污染十分严重，阳性率可达９０％以上［１］。１病原学 猪细小病毒属…     

猪细小病毒病

猪细小病毒（Porcineparvovirus，PPV）为引起母猪繁殖障碍（reproductivefailure）的主要病原体之一。主要特征是引起胚胎和胎儿的感染和死亡，导致母猪发生流产、死胎、胎儿木乃伊化及新生仔猪的死亡。PPV呈世界性分布。我国８０年代初在不同地区分离到了病毒，并查明其为危害养猪业的主要病原体之一。１PPV病原学特性１．１PPV理化特性猪细小病毒分类为细小病毒科（Parvoviridae）。PPV为DNA病毒，PPV对热具有强大的抵抗力。Mary和Bachmann等的研究表明：０．５％漂白粉或氢氧化钠５min可杀死PPV，而２％戊二醛则需要２０min…     

猪细小病毒病的综合防治

猪细小病毒病是由猪细小病毒（PPV）引起的繁殖障碍病，该病主要表现为胚胎和胎儿的感染及死亡，特别是初产母猪发生死胎畸形胎和木乃伊胎，而其他年龄的猪感染后一般不见明显的临床症状（一）病原 猪细小病毒（PPV）为细小病毒科细小病毒属成员。病毒对热具有较强抵抗力，56℃48h、70℃2h病毒的感染性和血凝性均无明显改变，但80℃5min可使感染性和血凝活性均丧失。     

猪细小病毒的分离与鉴定

本试验从福建省某猪场疑似猪细小病毒病死胎的淋巴结、肝脏中分离到1 株病毒。病料接种PK-15细胞36 h后出现了圆缩、集聚、脱落等细胞病变,猪细小病毒阳性血清能特异性地中和该分离病毒。根据已发表的细小病毒(PPV) VP2基因的序列设计并合成了一对引物,采用PCR方法可扩增531 bp DNA片段。测序结果表明,分离株VP2基因与NCBI公布的NADL-2株的同源性高达99.2％,证实分离的病毒株为猪细小病毒。为进一步开展该病毒致病机理、流行病学、诊断研究与疫苗免疫等奠定了基础。     

Presence of porcine parvovirus in sera from pigs is independent of antibody titers

Porcine parvovirus (PPV) is a widespread DNA virus that causes reproductive failure in swine. The aim of the present study was to investigate the presence of PPV in sera of nursery piglets (healthy n = 191 and wasting n = 132) and regularly vaccinated sows (with different parity rank [PR] n = 129), collected from different herds. Altogether, 452 animals were sampled in 27 herds owned by five companies. All sera were analyzed for the presence of PPV DNA by nested-PCR. The samples from sows were in addition tested for the presence of antibodies by Hemagglutination Inhibition (HI). PPV DNA was detected in healthy piglets (15.7%), wasting piglets (18.2%) and sows (17.8%). 25 herds had at least one positive sample and four companies had positive animals. The serology revealed that 84.7% of the sows had detectable antibodies and the fourth PR sows had the highest mean PPV antibody titers. Thirteen sows (19.1%) were found to be positive for DNA detection in the presence of high levels of antibody titers (> 512). This finding indicates that PPV DNA can be detected in different swine production categories irrespective of antibody titers.     

猪细小病毒VP2蛋白单克隆抗体的制备及抗原捕捉ELISA方法的建立

为制备猪细小病毒VP2蛋白单克隆抗体(McAb),建立检测猪细小病毒的抗原捕捉ELISA方法 (AC-ELISA),本研究以原核表达的重组VP2蛋白作为免疫原,免疫6周龄BALB/c雌鼠,取其脾细胞与骨髓瘤细胞SP2/0进行融合,经间接ELISA方法筛选,成功获得了2株能稳定分泌抗猪细小病毒VP2蛋白的McAb,命名为3C4、5F8。以多克隆抗体作为捕获抗体、单克隆抗体5F8作为检测抗体,通过双抗夹心ELISA各个反应条件的优化,建立检测猪细小病毒抗原捕捉ELISA方法。该方法与日本乙脑病毒(JEV)、猪流行性腹泻病毒(PEDV)、伪狂犬病毒(PRV)、猪繁殖与呼吸综合征病毒(PRRSV)、猪瘟病毒(CSFV)均不发生交叉反应;与RT-PCR相比较,符合率、敏感性和特异性分别为93.6%、90.9%、94.4%。本研究建立的猪细小病毒AC-ELISA有良好的重复性、敏感性和特异性,可应用于猪细小病毒感染的早期诊断。     

Molecular detection of Torque teno sus virus in lymphoid tissues in concomitant infections with other porcine viral pathogens

In this study, 40 pigs with respiratory and wasting disorders from Cuban swine herds were screened by PCR for the presence of TTSuV1, TTSuV2, PCV-2, PPV and CSFV in spleen samples. The variability of the porcine TTSuV sequences obtained was investigated by phylogenetic analysis. This study showed for the first time that TTSuV1 and TTSuV2 were present in Cuban swine herds. The investigation revealed the following infection rates: TTSuV1 40%, TTSuV2 37.5%, PCV-2 70%, PPV 37.5% and CSFV in 52.5%. The presence of two or more of these viruses at different rates in the same spleen samples was revealed. Also, a higher genetic diversity of TTSuV2 sequences was observed regarding TTSuV1 sequences.     

猪瘟病毒猪细小病毒猪繁殖与呼吸综合征病毒猪伪狂犬病病毒多重PCR方法的建立以及初步应用

猪瘟病毒、猪细小病毒、猪繁殖与呼吸综合征病毒及猪伪狂犬病病毒均能导致猪繁殖障碍,对养猪生产影响很大。本研究通过设计4对针对这4种病毒的特异引物建立了多重PCR方法,分别对其最佳反应条件、特异性及敏感性进行了测定,结果表明:其敏感性可达到CSFV 10 TCID50,PPV 10TCID50,PRRSV 1 TCID50,PRV 100 TCID50 CSFV 10TCID50,PPV 10TCID50,PRRSV 1 TCID50,PRV 100 TCID50。同时具有较好的特异性,对猪瘟病毒石门株、猪瘟病毒兔化弱毒株、PRV闽南A株、PPV弱毒疫苗株、PRRSV KY 35株及PRRSV B13株6个毒株均能扩增出相应的片段,而BVDV、BDV均未扩增出相应的片段。本方法的建立对于这4种病毒病的早期快速检测具有十分重要的意义。     

A serological survey of selected pathogens in wild boar in Slovenia

Serum samples collected from 178 shot wild boars (Sus scrofa) were tested for the presence of antibodies against classical swine fever virus, Aujeszky's disease virus (ADV), porcine reproductive and respiratory syndrome virus, porcine respiratory coronavirus (PRCV), transmissible gastroenteritis virus, swine influenza virus, porcine parvovirus (PPV), swine vesicular disease virus, Actinobacillus pleuropneumoniae (APP), Mycoplasma hyopneumoniae, Salmonella spp., Brucella spp. and Haemophilus parasuis (HPS) throughout Slovenia during the hunting season 2003/2004. The number of samples corresponds to 3% of the total hunting bag. By enzyme-linked immunosorbent assay (ELISA) antibodies against ADV were detected in 55 sera (31%), against PRCV in five sera (3%), PPV in 87 sera (49%), APP in 93 sera (52%), M. hyopneumoniae in 38 sera (21%), Salmonella spp. in 85 sera (47%) and HPS in 33 sera (18%).     

福建省4个地区规模化猪场细小病毒病血清学调查

应用酶联免疫吸附试验方法对福建省4个地区的33个规模化猪场共计667份血清样品进行了猪细小病毒病抗体检测。检测结果总阳性数为475份,平均阳性率为71.2%,其中总强阳性数308份,平均强阳性率为64.8%。结果表明福建省部分地区可能存在猪细小病毒病流行隐患。     

散养户猪群细小病毒感染的血清学调查

为了解大理地区猪细小病毒(PPV)感染的情况,从大理地区58个散养户采集了243份猪血清,采用间接ELISA方法对血清样本进行细小病毒抗体检测。结果显示,243份猪血清中抗PPV抗体阳性率为85.60%,表明大理地区散养户猪群细小病毒病已经普遍流行,结果值得关注。     

甘肃省四种母猪繁殖障碍性疫病抗体血清学检测

运用乳胶凝集试验(LAT)和ELISA方法对酒泉、张掖、金昌、武威、兰州、临夏、白银、定西、天水和平凉10个市州38个规模化和农村个体养猪场送检的619份血样和血清进行了PPV、PR、PRRS和JE免疫抗体检测,3年度平均阳性率PPV为80.83%、PR为60.70%、PRRS为43.39%、JE为47.57%,免疫抗体平均阳性率以PPV最高,PRRS和JE免疫抗体平均阳性率偏低。对8市州24个猪场采送的132份血清进行的PPV、PR、PRRS和JE感染抗体检测表明,PPV感染抗体平均阳性率为18.57%、PR感染抗体平均阳性率为15.28%、PRRS感染抗体平均阳性率为23.28%J、E感染抗体平均阳性率为24.14%。     

Porcine circovirus-2 and concurrent infections in the field

Porcine circovirus-2 (PCV-2) is the necessary cause of post-weaning multisystemic wasting syndrome (PMWS) in swine; however, a variety of co-factors, including other infectious agents, are thought to be necessary in the full expression of disease. Porcine parvovirus (PPV) was found in the inoculum used in the first experiments to reproduce PMWS in gnotobiotic swine. Retrospective and prospective studies in the field and laboratory have demonstrated PCV-2 can act synergistically with PPV to enhance the severity of PMWS. PCV-2 has been shown to play a role in the porcine infectious disease complex (PRDC). Other co-infecting agents with PCV-2 in the lung include, porcine reproductive and respiratory syndrome virus (PRRSV), swine influenza virus (SIV) and Mycoplasma hyopneumoniae. Exposure of pregnant sows to PPV, PRRSV, or encephalomyocarditis virus may interact with PCV-2 infected foetuses. The severity of hepatic lesions in PCV-2 infected pigs may be enhanced by co-infection with agents such as swine hepatitis E virus and Aujezsky's disease virus. Additional studies are required to determine the mechanistic basis for the interaction of PCV-2 with other agents in the pathogenesis of the various clinical syndromes that have been associated with PCV-2 infection.     

Oronasal and intramuscular vaccination of swine with a modified live porcine parvovirus vaccine: multiplication and transmission of the vaccine virus

An attenuated strain NADL-2 of porcine parvovirus (PPV) has been used at the 54th cell culture passage as a modified live-virus (MLV) vaccine. The present study was conducted to determine the minimum immunizing dose of MLV, the extent of MLV multiplication in swine tissues, and its transmission from swine administered MLV oronasally or intramuscularly. Immune response to MLV was dose dependent and swine responded to as little as 10(2) median cell-culture infective doses (CCID50). A 10(5) CCID50 of MLV, the largest dose given, induced the best immune response and was used in subsequent experiments. Route of MLV administration also was found to be important. The MLV replicated in tissues of swine after IM inoculation; however, viral antigen in tissues was less, as measured by immunofluorescence, and serum hemagglutination-inhibition titers for PPV were lower in MLV-inoculated swine than we have previously observed in virulent PPV-inoculated swine. In contrast, oronasal inoculation with MLV did not consistently result in infection of pigs; only 5 of 23 swine had virologic and/or serologic evidence of infection. Virus transmission studies indicated that MLV is shed in feces, but shedding occurs later than that in virulent-PPV-inoculated swine and is inconsistent. Delayed transmission of MLV was observed in contact pigs, which were seronegative at 2 weeks, but became seropositive at 4 weeks--indicating that perhaps a virus population capable of infecting pigs by oronasal route was selected by passage through the pig.(ABSTRACT TRUNCATED AT 250 WORDS)