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1禽肿瘤病病毒禽肿瘤病病毒包括疱疹病毒、马立克氏病病毒(MDV)、网状内皮组织增生病病毒(REV)、禽白血病和禽白血病病毒J亚群(ALV-J)。火鸡对MDV、REV以及相对罕见的反转录病毒——淋巴细胞增殖病病毒(LPDV)易感。MDV为双股DNA病毒, 相似文献
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禽白血病(Avian leukosis)是由禽白血病病毒(Avian leukosis virus,ALV)引起的以造血细胞增生为主的一类传染病,对养禽业危害最大的是禽淋白细胞性白血病.禽白血病病毒属反转录病毒科C型肿瘤病毒属,其亚群特异性由病毒囊膜糖蛋白gp85决定. 相似文献
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禽白血病(avian leukosis,AL)是由反转录病毒科甲型反转录病毒属禽反转录病毒(avian leukosis virus,ALV)引起的以禽类造血组织中某些细胞成分增生为主的各种可传染的肿瘤疾病.根据病毒中和试验宿主范围和囊膜糖蛋白的特性及其它一系列标准,将禽白血病/肉瘤群病毒划分为A到J 10个亚群,其中分离自鸡的有6个亚群(A、B、C、D、E、J).鸡J亚群白血病病毒(ALV-J)是1988年Payne等[1,2]首次从商品代肉用鸡中分离到并鉴定出的鸡白血病病毒的一个新亚群. 相似文献
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禽网状内皮组织增殖病(Reticuloendotheliosis RE)是由反转录病毒科中的禽网状内皮组织增殖病病毒(RE Virus REV)引起的鸡、鸭、火鸡和其他 相似文献
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禽白血病是由反转录病毒(禽白血病/肉瘤病毒群)引起的以造血组织细胞异常增生为特征的肿瘤性疾病.根据病毒囊膜糖蛋白的特性可分为10个亚群(A～J).其中J亚群禽白血病病毒(ALV-J)自1989年英国Payne[1]在肉鸡群中首次发现以来,在世界各地肉鸡群中陆续暴发了J亚群禽白血病. 相似文献
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马传贫病毒(EIAV)和人免疫缺陷病毒(HIV)同属于反转录病毒科的慢病毒属成员。目前,反转录病毒科包括七个属:哺乳动物B型肿瘤病毒属;哺乳动物C型反转录病毒属;禽C型反转录病毒属;D型反转录病毒属;泡沫病毒属;HTLV-BLV属和慢病毒属。在慢病毒属中主要包括有:梅地-维斯纳病毒、马传贫病毒、牛免疫缺陷病毒、山羊关节炎-脑炎病毒、人免疫缺陷病毒和猴免疫缺陷病毒等。它们是一组形态结构相关的病毒群。EIAV与HIV在病毒分类学上具有特殊的亲缘性。 相似文献
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<正> 禽白血病是由禽白血病病毒引起的慢性传染病,包括各种良性和恶性肿瘤,白血病病毒是一种反转录病毒(类似于人的艾滋病毒,但不感染人)。禽白血病病毒分为A、B、C、D、E和J等亚群.其中A、B、C、D和J亚型属于外源性禽白血病病毒,不会 相似文献
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禽白血病与马立克氏病均为肿瘤性疾病.禽白血病属反转录病毒科,禽C型反转录病毒属,划分为A～J 10个亚群[1].1991年Payne首次报道,从商品代肉用鸡中分离得到J亚群禽白血病病毒(ALV-J),主要引起肉鸡的髓细胞瘤[2].…… 相似文献
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根据NCBI公布的禽内源性反转录病毒ALVE1序列设计引物,以SPF鸡胚制备的成纤维细胞为生物材料,建立了ALVE基因序列分析、甲基化水平和转录表达检测方法。以鸡胚成纤维细胞(chicken embryo fibroblast cell,CEF)和巨噬细胞系(HD11)两种细胞的基因组为模板,通过常规PCR扩增获得了1912 bp的扩增产物,测序后与内源性ALVE1序列比对,核苷酸同源性高达98%以上,说明扩增产物为内源性病毒序列。同时,利用焦磷酸测序分析LTR片段甲基化水平,结果显示,LTR在非免疫细胞CEF中的甲基化水平显著高于巨噬细胞系HD11。利用常规RT-PCR和荧光定量PCR在两种细胞均检测到禽内源性反转录病毒LTR基因、gag基因、pol基因和env基因的转录表达。本研究为今后分析禽内源性反转录病毒ALVE功能提供了方法,同时也为深入研究禽内源性反转录病毒ALVE表观遗传学调控机制奠定了基础。 相似文献
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禽白血病(avian lenkosis,AL)是由一种常见的反转录病毒禽白血病/肉瘤病毒群中的病毒引起,以在成年鸡中产生淋巴样肿瘤和产蛋量下降为主要特征[1]。近年来,禽白血病对养禽业的危害日益严重。据报道,作为全国地方家禽品种资源最 相似文献
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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
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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
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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
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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
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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
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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
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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
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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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