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用从北京地区几家规模化猪场腹泻仔猪分离鉴定的大肠埃希氏O60、O141、0139、09和064制成多价油乳剂灭活苗，以0.2mL/只剂量免疫小白鼠，分别于免疫后7、14、30和60d攻毒，结果免疫14d后可获得100%保护；用该多价油乳剂灭活苗分别在母猪产前40d和15d肌肉注射2mL，对免疫母猪所产仔猪的保护率达95.0%以上。 相似文献
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本研究选取鸭致病性大肠埃希菌（E．coli）常见血清型O1、O2、O18、O78和3株分离自发病鸭场、毒力强、免疫原性好的巴氏杆菌（Pasteurella multocida,P砌）D22、D23、D157作为制苗菌株,分别以鲜血琼脂和马丁琼脂进行固体表面培养制备的抗原与蜂胶佐剂高速乳化,制备鸭多杀性巴氏杆菌-大肠埃希菌二联多价蜂胶灭活疫苗。结果表明,疫苗安全可靠,雏鸭一免后第14天对同源E．coli、Pm攻击免疫保护率为100％和90％;雏鸭二次免疫后第14天的免疫保护率均为100％。用间接ELISA对免疫鸭进行抗体消长规律检测,7日龄商品麻鸭首免后20d抗体达到高峰,抗体维持时间在54d以上;首免7d后进行二免,可产生显著高于一免的抗体水平。疫苗免疫雏鸭能够显著（P〈0．05）或极显著（P〈0．01）地增强T细胞的免疫力,可维持3周左右。疫苗在4℃可保存12个月以上。 相似文献
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产肠毒素性大肠埃希氏菌基因工程疫苗的研究进展 总被引：8，自引：1，他引：7
简述了产肠毒性大肠埃希氏菌（ETEC）K88-K99、K88ac-LTB、K99-F41和ST-LT双价基因工程疫苗的研制方法、生产工艺、免疫效果及生态效应及其研究进展，同时阐明了用这些疫苗免疫妊娠母畜，可使吸吮了母畜初乳的幼畜的腹泻发病率和死亡率显著下降，且不会带来生态环境污染。认为这些基因工程疫苗仍有不足之处，需要进一步加以改进。 相似文献
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作者制备了3批牦牛大肠埃希氏菌病蜂胶疫苗。制备了蜂胶佐剂和培养基,进行了牦牛大肠埃希氏菌的菌液培养、纯粹检验、活菌计数、灭活及无菌检验,配苗、分装及成品检验。3批牦牛大肠埃希氏菌病蜂胶疫苗无菌检验为阴性;物理性状检验为：静置后上层是乳黄色液体,下层为土黄色沉淀,振荡后呈均匀混浊液;经家兔安全检验结果为安全;经家兔效力试验,免疫后家兔抗体效价≥12．709lg2,对家兔具有免疫保护作用;蜂胶疫苗经防冻试验证明,随着蜂胶含量的增高,防冻效果越好。本试验为西藏牦牛大肠埃希氏菌病的预防提供依据。 相似文献
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《中国兽医学报》2017,(9):1659-1663
为了解猪病毒性腹泻(PED)疫苗免疫后母猪乳汁中IgA抗体消长规律,筛选100头妊娠母猪,平均分为5组(4个试验组和1个对照组),采用"猪流行性腹泻病毒(PEDV)-猪传染性胃肠炎病毒(TGEV)-猪轮状病毒(PoRV)三联弱毒疫苗"(PTR)和"PEDV-TGEV二联灭活疫苗"(PT)进行不同的免疫。其中,试验Ⅰ组产前40d和产前20d免疫PTR,试验Ⅱ组产前40d和产前20d免疫PT,试验Ⅲ组产前40d免疫PTR和产前20d免疫PT,试验Ⅳ组产前40d免疫PT和产前20d免疫PTR,对照组产前40d和产前20d注射生理盐水。通过PEDV IgA抗体检测试剂盒分别检测母猪分娩后0,1,2,3,5,7,10,14d各组乳汁中特异性PEDV IgA抗体水平。结果显示,试验组IgA水平明显高于对照组,其中试验Ⅰ、Ⅱ组与试验Ⅲ、Ⅳ组间差异极显著(P<0.01),而试验Ⅰ、Ⅱ组间以及试验Ⅲ、Ⅳ组间差异不显著(P<0.05)。结果表明,产前40d和产前20d交替使用PTR和PT的抗体滴度明显优于单一接种PTR或PT的抗体滴度。其中只注射PTR母猪分娩后10d乳汁对仔猪没有保护力,注射PT母猪分娩后7d乳汁对仔猪没有保护力。通过本试验基本上了解了PEDV母源抗体消长规律,为今后规模化猪场制定免疫程序提供理论支持。 相似文献
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1日常防制措施1.1妊娠母猪饲养管理疫苗的接种常选用以下几种疫苗。仔猪黄痢油剂苗,母猪临产前20-40天,肌肉注射,对仔猪黄痢的预防效果较好。大肠杆菌遗传工程活菌苗,母猪临产前20-25天口服,对仔猪黄白痢均有效。仔猪腹泻基因工程K88、K99双价灭活苗,母猪产前21天左右耳根皮下注射,主要预防仔猪黄痢。仔猪大肠埃希氏菌病三价灭活疫苗K88、K99、K987P,母猪产前15天、40天各肌肉注射一次,预防仔猪黄白痢。 相似文献
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选用4株带有K88、K99、987P、F41粘附素抗原的产肠毒素性大肠杆菌,分别接种于BBL、Minca、Slanetz和Minca培养基进行培养,将培养物加热提取粘附素抗原后,加入油佐剂制成四价亚单位疫苗。经成品检验合格后分别免疫小鼠和怀孕母猪,同时监测怀孕母猪抗体。最后1次免疫后15 d,分别用同源ETEC确定的攻毒剂量攻击。结果显示,经2次免疫后,K88、K99、987P、F41对小鼠的免疫保护率与1次免疫没有显著差异(P>0.05);对仔猪,1次免疫跟2次免疫均可显著地降低腹泻指数(P<0.05),2次免疫与1次免疫没有显著差异(P>0.05)。怀孕母猪免疫1周后(产前23 d)抗体开始上升,第2周(产前16 d)达到高峰。2次免疫后抗体迅速回升,第4周(产前2 d)达到最高峰,产后2 d抗体大幅度下跌,几近免疫前水平。二免母猪所产仔猪发病率明显低于一免母猪(P<0.05)。攻毒保护试验和抗体消长规律的结果表明,制备的仔猪大肠杆菌病K88-K99-987P-F41四价亚单位疫苗具有良好的免疫原性,能有效预防仔猪大肠杆菌病的发生。 相似文献
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用猪流行性腹泻（PED）和传染性胃肠炎（TGE）弱毒二联疫苗（下称二联苗）免疫PED和TGE抗体阴性的妊娠母猪，仔猪出生后第7、14、21和28d抽取仔猪血样用微量血清中和试验检测血清抗体。结果，免疫母猪所产仔猪通过哺乳获得了相当高的血清抗体，在出生后第7d时接近母体的中和抗体水平，并随日龄增大而下降。二联苗免疫母猪所生仔猪和相同株的PED、TGE疫苗株免疫母猪所生仔猪的血清抗体变化基本相似。用二联苗免疫PED和TGE抗体阴性的10日龄仔猪，并于免疫后以7d的间隔（1月龄内）或半月（1月龄后）间隔采取血样进行血清抗体检测。结果，用二联苗免疫抗体阴性的10日龄仔猪，抗体在免疫后第21d（TGE）或第28d（PED）达到最高值，但抗体下降缓慢，在免疫后第5月，免疫猪血清中仍能检测出抗体。相同弱毒株的PED和TGE疫苗免疫组的结果与之基本相同。提示，PED和TGE弱毒株联合免疫在诱导妊娠母猪和小猪产生抗体以及母猪产后向哺乳仔猪传递抗体方面未见有相互影响的现象。 相似文献
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试验选择广东某规模化猪场怀孕母猪30头及其所产仔猪30头用进口猪伪狂犬病病毒基因缺失疫苗(B苗)和国产猪伪狂犬病病毒基因缺失疫苗(A苗)进行免疫试验.结果表明:各组母猪产前10 天免疫接种后20～30 d的母猪抗体水平接近或达到峰值,其所产仔猪10～60 d获得的母体抗体恰巧达到最佳.根据母猪产仔时抗体水平及其后代母源抗体维持时间的关系,建议母猪产前20～30 d为猪伪狂犬病病毒加强免疫接种的适宜时间,仔猪60日龄为适宜的首免时间;使用B苗和A苗免疫对母猪产前免疫是必要的,有利于控制带毒母猪猪伪狂犬病病毒野毒的排放,降低感染其他猪只的机会,提高仔猪保护率. 相似文献
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Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(9):347-350
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.
Heartworm in dogs in Canada in 1982 总被引：8，自引：8，他引：0
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1983,24(7):227-229
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Ovine scrapie was first recorded in Cyprus in 1985. Subsequently four dairy goats kept in two mixed flocks with affected sheep developed characteristic clinical signs similar to those seen in sheep. Fifteen goats from the two flocks were examined histologically and neurological lesions consistent with a diagnosis of scrapie were found in the four animals and in three others which had subsequently developed early neurological signs. These lesions were similar to those of naturally-affected sheep although neuronal degeneration and vacuolation were more severe in some cases. 相似文献
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Owen J Slocombe D McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(9):324-328
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16.
Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(6):504-508
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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Slocombe JO McMillan I 《The Canadian veterinary journal. La revue veterinaire canadienne》1985,26(10):323-327
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18.
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Slocombe JO Villeneuve A 《The Canadian veterinary journal. La revue veterinaire canadienne》1993,34(10):630-633
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