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猪圆环病毒免疫学研究进展 总被引：1，自引：0，他引：1
猪圆环病毒(PCV)在世界范围内广泛存在,可引起断奶仔猪多系统衰竭综合征(PMWS)、猪皮炎-肾病综合征(PDNS)和猪呼吸系统疾病症候群,给养猪业造成重大经济损失.已有研究表明,PCV-2感染和免疫刺激作用在PMWS发生中起关键作用,母源抗体对PMWS发生有被动保护作用,通过对初产母猪和经产母猪进行PCV-2免疫,增加母源性免疫和降低病毒血症的措施可以减少PMWS对仔猪死亡的影响.PCV-2疫苗现在已经在商业上应用,疫苗对PCV-2复制和PCVD的诱导增强作用似乎依赖于疫苗佐剂的类型和疫苗的接种时间.因此,基于有效的试验,在发生过PMWS感染的猪群,应该根据PCV-2感染的时间有目的地制定免疫接种方案,以控制或者减少PMWS的发生. 相似文献
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Ⅱ型猪圆环病毒（PCV-2）对猪的感染可导致临床表现不同的多种综合征和疾病,如仔猪断奶后多系统消耗性综合征（PMWS）、猪皮炎和肾病综合征（PDNS）、繁殖障碍、猪呼吸道疾病复合症（PRDC）、肉芽肿性肠炎、坏死性淋巴结炎,还可能渗出性表皮炎相关。仔猪的先天性震颤是否与PCV-2相关仍存在争议。除了PMWS之外,PCV-2在猪病中的涉及程度目前知之甚少。本综述着重介绍除PMWS以外的与PCV-2相关的综合征和疾病。 相似文献
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猪圆环病毒2型(PCV-2)主要侵害哺乳仔猪和育肥猪,引起断奶仔猪多系统衰竭综合征(PMWS)、猪皮炎与肾病综合征(PDNS)、猪呼吸道疾病综合征(PRDC)、PCV-2相关性繁殖障碍、仔猪先天性震颤(CT)、PCV-2相关 相似文献
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断奶仔猪多系统衰竭综合征(PMWS)是由猪圆环病毒2型(PCV-2)及猪蓝耳病病毒、猪细小病毒、副猪嗜血杆菌、猪伪狂犬病病毒、猪肺炎支原体、附红细胞体等多病原引起的一种新的传染病。PCV-2作为PMWS主要的、原发性病原,除可引起PMWS外,还可导致母猪繁殖障碍、断奶仔猪和育肥猪的呼吸道疾病、猪皮炎和肾病综合征及先天性震颤等。PMWS已成为我国规模化猪场的主要疫病,给我国的养猪生产造成了巨大的经济损失。1病原特征猪圆环病毒(PCV)属圆环病毒科、圆环病毒属,是已知的最小的病毒。PCV以滚环方式复制,呈20面体对称,无囊膜,直径17~22… 相似文献
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规模化猪场猪圆环病毒病的诊断及综合防制 总被引：2，自引：0，他引：2
猪圆环病毒2型(PCV-2)自发现以来,由其引起的疫病呈上升趋势,给全世界养猪业带来了巨大的经济损失。该病毒主要侵害哺乳仔猪和育肥猪,引起断奶仔猪多系统衰竭综合征(PMWS)、猪皮炎与肾病综合征(PDNS)、猪呼吸道疾病综合征(PRDC)、PCV-2相关性繁殖障碍、仔猪先天性震颤(CT)、PCV-2相关性肠炎等疾病。该病严重影响猪生长发育,且致死率较高,并引起典型的临床症状和病理变化。作者对PCV-2的特性、流行特征、猪圆环病毒相关疾病、诊断及综合防制措施作了简要的综述。 相似文献
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断奶仔猪多系统消耗综合症 ( PMWS)是一种新的猪传染病 ,主要侵害 6～ 8周龄仔猪 ,引起淋巴系统疾病、渐进性体重下降、呼吸道症状及黄疸 ,造成患猪免疫机能下降、生产性能降低。1 病原据报道 ,PMWS与感染猪圆环病毒( PCV)有关 ,分为二型 ,分别为 PCV- 1和PCV- 2。PCV- 2是 PMWS的主要病因 ,但不是唯一病因。PMWS很可能是 PCV与猪细小病毒 ( PPV)、猪繁殖与呼吸综合症 (蓝耳病 )病毒 ( PRRSV)等病原混合感染的结果 ,消瘦和呼吸困难是 PMWS的特征。2 流行病学PMWS主要侵害 6～ 8周龄仔猪 ,发病率4%～ 1 0 % ,死亡率 5 0… 相似文献
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正猪圆环病毒(PCV)在驻马店猪场感染十分普遍,据2016～2017年驻马店市动物疫病预防控制中心对辖区内猪场血清学调查发现圆环病毒2型(PCV-2)感染率高达77.34%。PCV能引起猪的多种发病症状,如断奶仔猪多系统衰竭综合征(PMWS)、猪皮炎肾病综合征(PMWS)、猪呼吸道综合征(PRDC)、仔猪先天性震颤(CT)等。现将一例保育猪发生圆环病毒感染的病例诊治分析如下。 相似文献
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Postweaning multisystemic wasting syndrome (PMWS) is a worldwide emerging disease of weaned piglets. The objective of this review is to summarize the current knowledge regarding PMWS, its causative agent, mode of transmission, diagnostic techniques to detect PCV-2, the possible control measures, and the association of PMWS and PCV-2 with porcine dermatitis and nephropathy syndrome (PDNS). The causative agent of PMWS is porcine circovirus type 2 (PCV-2), however, not all pigs infected with PCV-2 develop the syndrome. PCV-2 is consistently associated with PMWS and PMWS is considered not to occur without it. Both the syndrome and the virus are not regarded as new. Co-factors that could activate PCV-2 to cause PMWS are considered. This enigmatic nature of both the syndrome and the virus is triggering a concern towards uncertainties of the viral transmission, its introduction in to the herd, effective tools of diagnosis, and control strategies. 相似文献
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Porcine circovirus-2 and concurrent infections in the field 总被引：27，自引：0，他引：27
Ellis J Clark E Haines D West K Krakowka S Kennedy S Allan GM 《Veterinary microbiology》2004,98(2):159-163
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. 相似文献
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Gagnon CA Tremblay D Tijssen P Venne MH Houde A Elahi SM 《The Canadian veterinary journal. La revue veterinaire canadienne》2007,48(8):811-819
Since late 2004, the swine industry in the province of Quebec has experienced a significant increase in death rate related to postweaning multisystemic wasting syndrome (PMWS). To explain this phenomenon, 2 hypotheses were formulated: 1) the presence of a 2nd pathogen could be exacerbating the porcine circovirus 2 (PCV-2) infection, or 2) a new and more virulent PCV-2 strain could be infecting swine. In 2005, 13 PMWS cases were submitted to the Quebec provincial diagnostic laboratory and PCV-2 was the only virus that could be found consistently by PCR in all 13 samples. The PCR detection results obtained for other viruses revealed the following: 61.5% were positive for porcine reproductive and respiratory syndrome virus, 30.8% for swine influenza virus, 15.4% for porcine parvovirus, 69.2% for swine torque teno virus (swTTV), 38.5% for swine hepatitis E virus (swHEV) and 84.6% for Mycoplasma hyorhinis; transmissible gastroenteritis virus and porcine respiratory coronavirus (TGEV/PRCV) was not detected. Sequences of the entire genome revealed that these PCV-2 strains belonged to a genotype (named PCV-2b) that has never been reported in Canada. Further sequence analyses on 83 other Canadian PCV-2 positive cases submitted to the provincial diagnostic laboratory during years 2005 and 2006 showed that 79.5% of the viral sequences obtained clustered in the PCV-2b genotype. The appearance of the PCV-2b genotype in Canada may explain the death rate increase related to PMWS, but this relationship has to be confirmed. 相似文献
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Cao S Chen H Zhao J Lü J Xiao S Jin M Guo A Wu B He Q 《Veterinary research communications》2005,29(3):263-269
Multiplex PCR was established to detect porcine circovirus type 2 (PCV-2), porcine parvovirus (PPV) and porcine pseudorabies virus (PRV) and applied to samples from 137 piglets exhibiting clinical signs of postweaning multisystemic wasting syndrome (PMWS). PCV-2 DNA was detected from all samples. Moreover, 43 samples were positive for PPV but negative for PRV; 11 samples were positive for PRV but negative for PPV; and 35 samples were positive both for PPV and PRV. These results suggests that PCV-2 co-infection with PRV and PPV may play an important role in PMWS. Also, multiplex PCR is an appropriate candidate method for diagnosis of PCV-2, PRV and PPV simultaneously in field cases. 相似文献
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A review of porcine circovirus 2-associated syndromes and diseases 总被引：25，自引：0，他引：25
Chae C 《Veterinary journal (London, England : 1997)》2005,169(3):2012-336
Clinical expression of porcine circovirus 2 (PCV2) infection in swine may result in several distinct syndromes and diseases including post-weaning multisystemic wasting syndrome (PMWS), porcine dermatitis and nephropathy syndrome (PDNS), reproductive failure, porcine respiratory disease complex, granulomatous enteritis, necrotizing lymphadenitis, and possibly exudative epidermitis. Association of PCV2 with congenital tremor in piglets is still controversial. The extent of the involvement of PCV2 in swine disease other than PMWS is currently poorly understood. This review concentrates on PCV-2-associated syndromes and diseases other than PMWS. 相似文献
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Postweaning multisystemic wasting syndrome of pigs in Korea: prevalence, microscopic lesions and coexisting microorganisms 总被引：10，自引：0，他引：10
Kim J Chung HK Jung T Cho WS Choi C Chae C 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2002,64(1):57-62
A retrospective study was performed on natural cases of postweaning multisystemic wasting syndrome (PMWS), recorded from January 1999 to December 2000, to determine the prevalence, microscopic lesions, and other coexisting pathogens associated with PMWS. PMWS is diagnosed based on three criteria: the presence of clinical signs (retardation of growth), characteristic microscopic lesions (granulomatous inflammation and inclusion body), and the presence of porcine circovirus (PCV)-2 within these lesions. One hundred and thirty three (8.1%) of the 1634 pigs submitted from 1243 pig farms were diagnosed for PMWS. The affected pigs were from 25 to 120 days old, the majority (78 cases, 58.6%) being 60 to 80 days old. PMWS occurred each month during the two-year study period, but the incidence peaked in May (38 cases, 28.6%), followed by April (18 cases, 13.5%) and June (13 cases, 9.8%). The most consistent and characteristic lesions were multifocal, granulomatous inflammation in lymph nodes, liver and spleen, characterized by infiltration of epithelioid macrophages and multinucleated giant cells. The majority of cases (113 cases, 85.0%) was dual infection with other pathogens. The combination of PCV-2 and Hemophilus parasuis (43 cases, 32.3%) was shown to be the most prevalent followed by PCV-2 and porcine reproductive and respiratory syndrome virus (39 cases, 29.3%). The consistent presence of PCV-2, but lower prevalence of other viral and bacterial pathogens in all pigs examined with PMWS, has led to the speculation that PCV-2 is the etiological agent causing PMWS. 相似文献
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猪圆环病毒病研究进展 总被引：11，自引：0，他引：11
猪圆环病毒病是最近 1 0多年来才发现的一种新的猪病。研究表明 ,Ⅱ型猪圆环病毒 (PCV 2 )不仅是断奶仔猪多系统衰竭综合症 (PMWS)的病原 ,而且能够引起多种猪病。近年来 ,由PCV 2引起的疾病主要有PMWS、猪皮炎及肾病综合征、猪增生性坏死性肺炎等 ,另外 ,猪呼吸与繁殖障碍综合征、猪细小病毒、传染性先天性震颤等均与PCV 2感染有重要关联。随着规模化养殖业的不断发展 ,由PCV 2引起的疫病呈上升趋势 ,给全世界养猪业带来了巨大的经济损失。为了探讨有效控制本病的方法 ,特对该病的病原学、流行病学、致病机理、诊断及防制措施的研究情况进行了综述 相似文献
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Staebler S Buergi E Litzenberger B McCullough K McNair I McNeilly F Pospischil A Sydler T 《Schweizer Archiv für Tierheilkunde》2004,146(10):461-8; discussion 469
Postweaning wasting is a major worldwide problem in pig production, particularly with respect to the disease termed postweaning multisystemic wasting syndrome (PMWS). In addition to wasting, PMWS symptoms include respiratory distress, diarrhoea, pallor and occasional cases of jaundice. The causative agent is porcine circovirus type 2 (PCV-2). The objective of the present study was to determine the significance of PMWS and similar conditions in Switzerland. A total of 72 weaned piglets from 26 farms showing wasting were examined for the presence of PCV-2 by immunohistochemical and histological analysis and 57 piglets from 21 farms were examined serologically. Possible causes for wasting other than PCV-2 were investigated by macroscopic, histological and bacteriological methods. PCV-2 antigen was identified immunohistochemically in the lymphatic organs in 11 of these 72 piglets. However, only 4 animals showed histological changes typical of PMWS. PCV-2 antibodies were found in 70% of the piglets. Piglets with wasting syndrome not associated with PCV-2 infection suffered from conditions including porcine proliferative enteropathy, gastric ulcers, polyserositis and polyarthritis. The most frequent condition was chronic enteritis not associated to circovirus infection. The results from the serological analyses indicate a wide distribution of PCV-2 in the Swiss pig population. However, confirmed cases of PMWS were rare in the investigated piglets. 相似文献