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1.
鸡致病性埃希氏大肠杆菌不同菌株间同源性抗原的研究 总被引：1，自引：0，他引：1
通过兔制备了３株引起鸡败血症的埃希氏大肠杆菌高兔血清,对分离自新疆不同地区的３０余株鸡致病性Ｅ．ｃｏｌｉ进行了玻板凝集试验和双向免疫扩散试验。结果证明,在琼扩试验中,不同的Ｅ．ｃｏｌｉ菌株间存在着同源性抗原成份,这种同源性抗原在绝大多数Ｅ．ｃｏｌｉ间都有数种之多,但是,这种相互间的同源抗原在玻板凝集试验中有时并不能表现,甚至有沉淀线出现的血清与抗原之间在玻板凝集试验中也不能检测出来。 相似文献
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采用滴鼻、口服和注射三种不同的免疫途径对鸡进行Ｅ．ｃｏｌｉ灭活疫苗的免疫后，通过试管凝集试验检测了试验鸡的血清抗体滴度变化。结果证明，滴鼻、口服接种Ｅ．ｃｏｌｉ灭活疫苗与注射Ｅ．ｃｏｌｉ灭活疫苗一样都可引起鸡血清抗体的应答，只是所产生的抗体水平较低。 相似文献
3.
鸡经不同途径接种大肠杆菌灭活苗的免疫应答 总被引：3，自引：0，他引：3
采用滴鼻，口服和注射三种不同的免疫途径对鸡进行Ｅ．ｃｏｌｉ灭活疫苗的免疫后，通过试凝集试验检测了试验鸡的血清抗体滴度变化。结果证明，滴鼻，口服接种Ｅ．ｃｏｌｉ灭活疫苗与注射Ｅ．ｃｏｌｉ灭活疫苗一样都可引起鸡血清抗体的应答，只是所产生的抗体水平较低。 相似文献
4.
微量凝集试验检测鸡大肠杆菌抗体方法的建立及应用 总被引：6，自引：0，他引：6
建立了检测鸡大肠杆菌（Ｅ．ｃｏｌｉ）抗 的微量凝集试验法，所用抗原由苗株制得。经方阵试验，抗原最适浓度为４０亿菌／ｍｌ，反应最佳时间为４小时。攻毒试验表明凝集抗体介在１：１６时免疫鸡保护率要达５０％以上，且凝集抗体水平与保护力呈明显正相关。经Ｅ．ｃｏｌｉ多价油乳剂灭活苗免疫的青年鸡在免疫后４２琦平均抗这７．２５ｌｏｇ２本法敏感性高、特异性强、染色抗原使结果判定更加客观和明显。为鸡大肠杆菌病的流行病 相似文献
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6.
以重组mE2蛋白为抗原建立检测猪瘟病毒抗体间接ELISA方法 … 总被引：8，自引：0，他引：8
以在Ｅ．ｃｌｏｉ高效表达的猪瘟病毒Ｅ２基因主要抗原编码区为抗原，以辣根过氧化物酶标记的兔抗猪ＩｇＧ为二抗，建立了检测猪瘟病毒抗体的间接ＥＬＩＳＡ方法。经检测筛选出最佳反应条件为；１．２μｇ／孔纯化的Ｅ．ｃｏｌｉ表达的ｍＥ２重组蛋白包被酶标板，用１０％的兔血清或马血清进行封闭，以正常Ｅ．ｃｏｌｉ裂解上清液稀释待检血清。 相似文献
7.
以重组mE2蛋白为抗原建立检测猪瘟病毒抗体间接ELISA方法的研究 总被引：18，自引：3，他引：15
以在Ｅ．ｃｏｌｉ高效表达的猪瘟病毒Ｅ２基因主要抗原编码区（ｍＥ２）为抗原,以辣根过氧化物酶（ＨＲＰ）标记的兔抗猪ＩｇＧ为二抗,建立了检测猪瘟病毒抗体的间接ＥＬＩＳＡ方法。经检测筛选出最佳反应条件为：１２μｇ／孔纯化的Ｅ．ｃｏｌｉ表达的ｍＥ２重组蛋白包被酶标板,用１０％的兔血清或马血清进行封闭,以正常Ｅ．ｃｏｌｉ裂解上清液稀释待检血清。试验表明应用重组ｍＥ２蛋白作为诊断ＨＣＶ抗原具有特异性高、抗原易纯化和成本低等特点。 相似文献
8.
为评价不同抗菌药对鸡大肠杆菌染的疗效，进行了现场实验，所用的抗菌药物有：羟氨苄青霉素，恩诺弗扎林、呋喃它酮、氟甲喹和新霉素，采用两个大肠杆菌的分离株进行两个试验，第一个试验采用对阿莫克西林和新霉素敏感型的Ｅ．ｃｏｌｉ健康分离株，第二个试验采用对弗扎林，呋喃它酮和氟喹敏感的血清Ｏ７８Ｅ．ｃｏｌｉ分离株，以在鸡接种时或接种后２４小时应用１０％恩诺弗扎林的抗感染效力最佳。 相似文献
9.
本试验就鸡致病性埃希氏大肠杆菌（Ｅ．ｃｏｌｉ）用２１种市售抗菌药物进行了敏感性试验和临床治疗，经对１６株鸡致病性Ｅ．ｃｏｌｉ的药敏试验和发病鸡的治疗效果表明，极敏感药物为氟哌酸、庆大小诺霉素、呼拉沙星和喹乙醇。敏感药物为新霉素、禽乐灵、枝原净和吡哌酸。鸡致病性Ｅ．ｃｏｌｉ对卡那霉素、庆大霉素、痢菌净和禽喘灵等药物有不同程度的耐药性。对其它药物不敏感。 相似文献
10.
从肿头综合征鸡分离出产Vero毒素E.coli 总被引：1，自引：1，他引：0
本研究从哈尔滨郊区某鸡场肿头综合征（ Ｓ Ｈ Ｓ）鸡分离出 ３ 株血清型为 Ｏ７８ 的埃希氏大肠杆菌（ Ｅ．ｃｏｌｉ）,从鞍山 Ｓ Ｈ Ｓ病料分离出 １ 株血清型为 Ｏ８ 的 Ｅ．ｃｏｌｉ。并证实这 ４ 株 Ｅ．ｃｏｌｉ 能够对 Ｖｅｒｏ 细胞产生毒性作用,与产 Ｖｅｒｏ 毒素的 Ｅ．ｃｏｌｉ一致。对哈尔滨市郊 Ｓ Ｈ Ｓ病鸡做病理组织学观察,主要变化为头部皮下组织,头盖骨气室及鼻粘膜下纤维素性化脓性炎症,水肿和大肠杆菌性肉芽肿,心、肝、肾等器官炎症变化并有大量异嗜性粒细胞和细菌团块。 相似文献
11.
We studied 103 Escherichia coli strains isolated from suckling and weaned piglets with diarrhea using different ELISA tests. K88 fimbrial antigen was determined by the slide agglutination test and the ELISA inhibition method. LT and STa enterotoxins were tested directly in the microtiter plates using monoclonal antibodies. It was found that 56.3% strains possessed K88 antigen, all of which were of the K88ac type. There was 100% correlation between the slide agglutination and ELISA tests. Of the 103 strains tested 68.9% produced LT or STa or both toxins. LT-positive strains were the most common ones in both groups of piglets. All K88-positive strains were enterotoxigenic and elaborated LT (56 strains) or LT and STa (2 strains); STb production was not determined in this study. Our ELISA tests were easy to perform, specific and can be used for determination of K88 and enterotoxins in E. coli strains isolated from piglets. 相似文献
12.
As a result of a Ministry of Agriculture & Fisheries survey on ovine abortions, 76 isolates of Campylobacterfetus fetus were obtained. These isolates were from four farms in the southern Hawkes Bay, with an abortion incidence of 2.8% to 9.1%. Antisera to eight different strains of C. fetus fetus were made in rabbits. Strains were then examined using whole cell tube agglutination tests and sensitised Staphylococcal Protein A slide agglutination tests. Heat labile antigens were examined by absorbing antisera with heat-treated bacteria. Two broad serogroups were found, but within-group variation was demonstrated by cross-absorbing antisera. The isolates from one farm were all of a single broad serogroup. Both serogroups were found on the remaining three farms. Evidence for the presence of two major serogroups was also obtained by immobilisation tests and antigen analysis by gel diffusion. 相似文献
13.
Slide agglutination tests using single absorbed and double absorbed antisera indicated that the Att 25 prototype Escherichia coli strain 25 KH9 produces the F(Y) adhesion; that this E coli also produces at least one other surface antigen not found on the F(Y) prototype E coli strain 11a; and that F(Y)+ E coli strain 28a produces at least one other surface antigen not produced by the prototype strains for the F(Y) and Att 25 antigens. These antigens were found on E coli isolated from outbreaks of calf diarrhoea in the United Kingdom. 相似文献
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15.
K H Hoblet E M Kohler L J Saif K W Theil W L Ingalls 《American journal of veterinary research》1986,47(9):1910-1912
The onset of fecal shedding, serogroup involvement, and association of hemolytic Escherichia coli with the postweaning diarrhea syndrome were studied in swine. The only E coli O antigen, detected by slide agglutination with the antisera used, was O157; K antigens were not detected. The ligated intestinal loop test (LILT) was used for enterotoxigenicity testing. All O157 serogroup isolates (n = 9) were hemolytic, and 89% (8 of 9) were LILT positive. Of all hemolytic isolates tested, 59% (10 of 17) were LILT positive. Twenty-seven nonhemolytic isolates were tested for enterotoxigenicity; of these, 45% (12) were LILT positive. The onset of postweaning diarrhea coincided with the modal onset of hemolytic E coli shedding at postweaning day 7. At postweaning day 7, hemolytic E coli shedding was concurrently associated with diarrhea (P less than 0.0005), whereas later during the postweaning period, this was not the situation. 相似文献
16.
R E Holland N Sriranganathan L DuPont 《Journal of the American Veterinary Medical Association》1989,194(3):389-391
Enterotoxigenic Escherichia coli was isolated from a 3-day-old foal with diarrhea. The isolate was distinguished from nonpathogenic E coli by determining the presence of pili and enterotoxin production. A standard slide agglutination test was performed, using pooled antisera that contained antibodies against K99 and F41 pilus antigens, K87 capsular antigen, and 0101 somatic antigen. Agglutination of the antisera occurred in the presence of the isolate. Piliation was verified by use of negative-contrast electron microscopy. Further, the isolate produced a heat-labile enterotoxin-like antigen that cross-reacted with a reagent containing formalin-treated, heat-killed Staphylococcus aureus (cowan 1 strain) bearing anti-cholera antibodies. On the basis of the aforementioned procedures and the absence of other identifiable enteric pathogens, we believe that E coli was responsible for causing diarrhea in the foal. 相似文献
17.
近年来，从华东地区患腹泻仔猪中分离到一些表达K88菌毛的大肠杆菌，这些菌株只与K88a因子单抗反应，而不与b、c、d因子单抗反应。通过K88常规血清交叉吸收试验、SDS-PAGE、Western印迹，表明这些菌株不仅与K88ac参考菌株C83907制备的c因子血清反应，而且与以分离株SEC586制备且经K88ab、K88ac、K88ad参考菌株吸收后的血清也反应。对分离株SEC586、SEC464的K88主要亚单位结构基因faeG的克隆、测序，发现该基因由846对核苷酸组成，编码菌毛主要亚单位的262个氨基酸及21个氨基酸的信号肽，比国外报道的K88ac FaeG亚单位（263个氨基酸）少了1个氨基酸，比K88ab、K88ad（265个氨基酸）少了3个氨基酸。SEC586、SEC464菌株的FaeG亚单位氨基酸序列的同源性为97．7％，它们与K88ac的同源性为94．7％和96．2％；与K88ab的同源性为90．1％和91．2％；与K88ad的同源性为87．0％和88，6％。结果表明，新分离的K88ac大肠杆菌黏附素主要亚单位已发生了部分变异。 相似文献
18.
鸭疫里默氏菌一个可能新型的鉴定 总被引：4，自引：0，他引：4
用玻片凝集试验、试管凝集试验和琼脂扩散沉淀试验，对13个鸭疫里默氏菌分离株进行了血清型鉴定。玻片凝集试验中，这些菌株只与8型抗血清发生强凝集反应，试管凝集试验中，其代表菌株C882与8型参考菌株之间仅存在单向低度交叉凝集反应，且与1～19型中的其他18个血清型参考菌株无可见的交叉凝集反应；用C882吸收可消除8型抗血清与C882等菌株之间的交叉凝集反应，但不影响8型抗血清的同源凝集反应和沉淀反应能力。琼扩试验中，C882与1～19型参考菌株之间不产生可见的交叉沉淀反应。沉淀反应模式表明，以C882为代表的13株细菌的热稳定抗原具有同一性。结果表明，13株待检菌株可能属于一个新的血清型。 相似文献
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为了解四川省藏香猪源大肠埃希菌致病性、血清型及耐药性情况,从四川省藏香猪养殖场中无菌采集腹泻仔猪肝脏、肛拭子及粪便等组织病料253份中,分离得到155株大肠埃希菌。采用人工感染小鼠致病性试验、玻板凝集试验和KB药敏纸片法分别测定155株大肠埃希菌分离菌株的致病性、血清型及耐药性。结果显示,小鼠致病性试验表明155株分离菌中120株有致病性;玻板凝集试验表明120株致病性大肠埃希菌分离株属于14个血清型,以O111、O147、O109和O119为主要流行的优势血清型;耐药性试验表明120株致病性大肠埃希菌分离株对阿莫西林、氨苄西林、新霉素、磺胺间甲氧嘧啶4种药物耐药较严重,耐药率在94.2%~98.3%之间,对庆大霉素、氟苯尼考、多西环素等6种药物耐药率在44.2%~85.0%之间,对其他药物耐药率在15.0%~37.5%之间。说明该地区藏香猪源致病性大肠埃希菌血清型呈多样性分布,耐药性严重。 相似文献
20.
An evaluation of agglutination and coagglutination techniques for serotyping of Haemophilus pleuropneumoniae isolates 总被引：4，自引：0，他引：4
A comparative evaluation of rapid slide agglutination, tube agglutination, 2-mercaptoethanol tube agglutination, and coagglutination tests was made for serotyping isolates of Haemophilus pleuropneumoniae. The results indicated that a majority of the isolates could be serotyped by any of these tests. But, it was not uncommon to find isolates which were inagglutinable or poorly agglutinable in homologous sera. Heat treatment of whole-cell suspensions of such isolates was essential to unmask the serotype-specific antigenic determinants; however, in the process of heat treatment, cross-reactive common antigens of minor nature were also exposed. The antibodies involved in such cross-reactions were mainly of immunoglobulin M type, because the cross-reactivities were completely abolished in coagglutination and 2-mercaptoethanol agglutination tests. Thus, both these tests were satisfactory for serotyping inagglutinable mucoid strains. For serotyping strains which were either polyagglutinating or autoagglutinating, agglutination tests could not be used, but the coagglutination test proved to be satisfactory. The coagglutination test was serotype-specific, sensitive, simple, rapid, reproducible, and easier to read and interpret than rapid slide or tube agglutination tests. This test could be used to serotype mucoid, smooth, or rough isolates. 相似文献