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1.
猪圆环病毒属于圆环病毒科圆环病毒属,病毒粒子为二十面体对称结构,无囊膜,单股负链DNA,基因大小约2 000 bp,是现在已知最小的动物病毒之一。本文就近年国内外报道的猪圆环病毒(PCV1、PCV2、PCV3)的病原学、分子流行病学、致病机理、临床诊断方法以及防控等方面进行综述,以期为PCV诊断和防治等提供一定参考。 相似文献
2.
猪圆环病毒（Porcine circovirus,PCV）是迄今发现的最小的动物病毒之一。PCV具有PCV1和PCV2两种基因型。PCV1无致病性。PCV2有致病性,它不仅是断奶猪多系统衰竭综合症（Post-weaning multisystemic wasting syndrome,PMWS）的主要病原（Bolin等，2001；McNeilly等，2001）， 相似文献
3.
猪圆环病毒3型(PCV3)是一种新的猪圆环病毒,与猪皮炎和肾病综合征、母猪繁殖障碍及心脏和多系统炎症相关。为了建立一种同时快速检测猪圆环病毒2型(PCV2)和PCV3的双重PCR方法,根据GenBank收录的PCV2和PCV3基因序列,分别在PCV2 Cap基因和PCV3 Rep基因高度同源保守区设计并筛选2对特异性引物,经过双重PCR反应条件的优化,建立了同时检测PCV2/3的双重PCR检测方法。本方法可同时扩增出PCV2、PCV3的486,270bp特异性片段,而扩增猪繁殖与呼吸综合征病毒(PRRSV)、猪瘟病毒(CSFV)、伪狂犬病病毒(PRV)等病原核酸结果均为阴性;PCV2/3最低检出量分别为139,21.7拷贝/μL。经临床应用表明,本试验建立的双重PCR方法简便、快速,敏感度高,特异性强,为PCV2/3的鉴别诊断和联合检测提供了依据。 相似文献
4.
猪圆环病毒（porcine circovirus,PCV）属圆环病毒科,是已知最小的无囊膜单股环状DNA病毒,可在哺乳动物细胞中自律性复制（Todd等,1991）。圆环病毒科（Circoviridae）可分为二个属：圆环病毒属（Circovirus）和圆圈病毒属（Gyrovirus）。PCV、喙羽病毒（beak and feather virus）、鸽圆环病毒（pigeon circovirus）、 相似文献
5.
猪圆环病毒（PCV）可引起断奶仔猪进行性消瘦、淋巴组织等组织病变的一种多系统衰竭综合征的重要传染病。是目前已知最小的动物病毒,猪圆环病毒有2种不同的血清型,一种为猪圆环病毒I型（PCVl）;另一种为猪圆环病毒ll型（PCV2）。经实验证明,一般认为PCVl血清型无致病性,而PCV2血清型有致病性,并认为它是引起断奶仔猪... 相似文献
6.
猪圆环病毒(Porcine circovirus,PCV)是迄今发现的最小的动物病毒之一.PCV具有PCV1和PCV2两种基因型.PCV1无致病性.PCV2有致病性,它不仅是断奶猪多系统衰竭综合症(Post -weaning multisystemic wasting syndrome,PMWS)的主要病原(Bolin等,2001;McNeilly等,2001),而且是其他诸多传染病的病原之一.世界各国的兽医与养猪业者认为它是继猪繁殖与呼吸道综合征之后新发的重要的猪传染病,引起了国内外学者的广泛关注. 相似文献
7.
<正>猪圆环病毒(porcine circo virus,PCV)属于圆环病毒科圆环病毒属的成员,根据致病性、抗原性及核苷酸序列的差异,PCV可分为两个血清型,即PCV1和PCV2。其中源自污染猪源细胞PK-15的称为PCV1,对猪无致病性,但广泛存在猪体内及猪源细胞系。PCV2具有致病性,是仔猪断奶后多系统衰竭综 相似文献
8.
根据GenBank中20株猪圆环病毒（PCV2）核苷酸序列设计两对引物，建立的检测猪圆环病毒的多重PCR方法，其中引物P1、P2为PCV特异性，扩增938bp片段。P3、P4为PCV2特异性扩增490bp，因此本方法不仅可以扩增PCV片段，还可以同时区分PCV1和PCV2。该方法具有良好的特异性和敏感性，为猪圆环病毒的临床诊断与流行病学调查等研究奠定了基础。 相似文献
9.
猪圆环病毒是猪圆环病毒病的主要致病因素,该病给养猪业带来很大的经济损失。猪圆环病毒变异较快,是单链DNA病毒中最高的;易感猪主要通过消化道和呼吸道水平传播而感染,猪圆环病毒Ⅱ型(PCV2)人工或自然感染猪的排泄物、鼻腔、口腔和扁桃体拭子和患畜的尿液和粪便中均能检测到PCV2。断奶仔猪多系统衰竭综合征(PMWS)的发病主要与猪体内PCV2含量有关。PCV2特异抗体对猪群的PCV2感染具有保护作用。PCV2诱导猪继发性免疫缺陷,淋巴细胞缺失,影响PCV2感染结果的因素有:病毒、宿主、混合感染和免疫调节等。 相似文献
10.
猪圆环病毒病是由猪圆环病毒2型（porcine circovirus 2, PCV2）引起猪的一种传染病,是近几年来发现的较难控制的传染病。猪圆环病毒属于圆环病毒科、圆环病毒属的成员,是目前发现的最小的动物病毒。根据圆环病毒的致病性、抗原性及核苷酸序列可分为PCV1和PCV2两个型, 相似文献
11.
In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario. Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously. 相似文献
13.
In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%). Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada. 相似文献
14.
In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%). 相似文献
15.
In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection. 相似文献
17.
In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium. 相似文献
18.
In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated. Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively. 相似文献
19.
In late November 1987, 1246 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1987, and 50% of them responded. Veterinarians reported that 165,428 dogs were blood tested for heartworm disease and 511 dogs were found with D. immitis microfilariae. Another 78 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1987 as 589 (0.35%). 相似文献
20.
In late December 1986, 1224 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1986; 46% of them responded. Veterinarians reported that 150,989 dogs were blood-tested for microfilariae and 869 dogs were found with heartworm. Another 65 dogs were amicrofilaremic but diagnosed with heartworm disease and one was found with heartworm at necropsy to give the total number diagnosed in 1986 as 935 (0.62%). Heartworm was reported from Manitoba, New Brunswick, Ontario and Quebec, but most (810) of the cases were from Ontario. South-western Ontario continued to be the primary focus of the infection in Canada. There were 103 cases reported from Quebec, mostly from and around Montreal, and 21 cases from Manitoba, from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 33% of the cases were observed with clinical signs of heartworm disease and 81% had a history of not having left Canada. 相似文献
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