沙门氏菌马流产凝集试验抗原参考品的研制

为研制沙门氏菌马流产凝集试验抗原国家参考品,提高沙门氏菌马流产凝集试验相关试剂半成品和成品检验的准确性和可重复性,按照有关最新规定,在以往各批次沙门氏菌马流产凝集试验抗原参考品的制备和标定技术基础上,规范了该抗原参考品的制备方法 ;采用3种效价血清进行标定,监测其保存期内的稳定性,并将其应用于生产检验实践。结果表明,用该方法制备和标定的沙门氏菌马流产凝集试验抗原参考品效价稳定、品质良好,可作为一种国家参考品使用。     

马流产沙门菌fimY基因同源性分析及蛋白表达

为对马群中沙门菌进行快速、准确检测,根据GenBank公布的沙门菌菌毛蛋白fimY基因为模板设计一对特异性引物,用PCR方法扩增fimY部分基因。将fimY目的基因亚克隆至PGEX-4T-2原核表达载体,转入BL21(DE3)感受态细胞后用IPTG进行诱导表达,并对目的蛋白进行反应性检测。结果表明,克隆fimY基因大小为490bp;成功构建fimY原核表达载体PGEX-fimY,经SDS-PAGE显示带有GST标签的目的蛋白大小为47ku,与预期相符;Western blot证明,目的蛋白fimY能够结合沙门菌标准阳性血清,为建立马流产沙门菌间接ELISA检测方法奠定了基础。     

ELISA和微量凝集法检测马流产沙门菌血清抗体的比较

为比较微量凝集(MSAT)和间接ELISA方法检测马流产沙门菌血清抗体的检出率和符合率,本试验分别用全菌包被间接ELISA、MSAT法对采集的191份马血清及标准阴阳性血清进行马流产沙门菌抗体的检测,并对两种方法进行比较分析。MSAT法和间接ELISA法的阳性检出率分别为45.03%和47.12%,MSAT法与间接ELISA法的符合率为89%。MSAT法不需要精密的仪器,便于操作,操作周期短,但存在观察时的人为误差;间接ELISA具有较高的敏感性、特异性和准确性。在实践中可以将两种方法相结合使用。     

马流产凝集抗原及冻干阳性血清的保存期试验

马流产凝集抗原及冻干阳性血清的保存期试验康凯（中国兽药监察所北京，１０００８１）我国现行兽医生物制品规程（以下简称《规程》）收载的马流产凝集抗原、冻干阳性血清是作为因马流产沙门氏菌感染所致母马流产的诊断制品。《规程》规定，在２～８℃保存条件下，马流产...     

驴源马流产沙门菌的耐药表型及毒力基因检测

为了解驴源马流产沙门菌临床分离株的耐药表型及毒力基因的携带情况,本试验通过K-B药敏纸片扩散法对9株马流产沙门菌进行11种临床常用抗菌药物的敏感性测试,采用PCR方法检测与沙门菌致病性相关的10种毒力基因。结果显示:9株驴源马流产沙门菌存在2种耐药表型,对链霉素耐药率达100%,对阿莫西林耐药率为33%;10种毒力基因中仅traT未被检出,invA、avrA、ssaQ、mgtC、sopB、spvC、spvR、pefA和misL的检出率均为100%。结果表明,驴源马流产沙门菌耐药谱较为单一,但携带的毒力基因为多样性组合。     

初生马驹马流产沙门氏杆菌病的诊治

马流产沙门氏杆菌病是危害马匹严重的传染病之一。以妊娠母马突然发生流产,初生幼驹发生幼驹沙门氏杆菌病,日龄长的幼驹发生关节炎、滑液囊类等为特征。上述各病征总称为副伤寒。我场仅1971—1986年由马流产沙门氏杆菌所引起的初生幼驹的马流产沙门氏杆菌病(有的称之为幼驹脓毒败血症)达54匹,给养马业带来很大的损失,报告如下。流行病学调查一、一般情况:1971年至1986年共产     

马流产沙门菌鞭毛蛋白FljB的表达及对小鼠免疫效果的分析

为评价马流产沙门菌来源的鞭毛蛋白FljB(flagellin B)的免疫原性及免疫效果,本试验通过PCR扩增该菌的鞭毛蛋白基因FljB,构建重组质粒pET28a-FljB,并用表达纯化的重组蛋白FljB免疫小鼠。结果显示,该重组蛋白大小约为41 300。该蛋白能够诱导小鼠产生较高的体液免疫水平,二免后小鼠血清中抗体水平可达1∶21 500。该蛋白免疫后对小鼠的攻毒保护力为75%。本试验结果为进一步利用该蛋白进行马相关传染病的预防与控制奠定基础。     

新疆地区2株驴源马流产沙门菌的分离鉴定及致病性分析

【目的】研究确定导致新疆地区2个规模化驴场出现流产的疑似病原沙门菌,并探究其致病能力和耐药性情况。【方法】通过细菌分离培养、形态学观察、生化试验对分离菌进行了鉴定,并对分离菌的鞭毛基因FliC进行了PCR扩增及序列分析,通过致病性测定、荷菌量检测及病理组织学观察,鉴定和分析了分离菌的致病性,并通过药敏试验分析其耐药性。【结果】通过细菌分离培养、形态学观察、生化试验,确定分离到的2株细菌均为马流产沙门菌,分别命名为G1-1和XD1-2。对这2个分离株的鞭毛基因FliC的遗传进化分析结果显示,2株分离菌FliC氨基酸序列之间的相似性为99.0%,2株分离菌FliC氨基酸序列与爱尔兰马源马流产沙门菌分离株Ireland-HE801373、Ireland-HE801378株相似性均最高,且均为99.3%;分离株G1-1与爱尔兰马源马流产沙门菌分离株Ireland-HE801373和Ireland-HE801378及国内马源马流产沙门菌分离株China-KJ486797.1和China-KJ486769.1亲缘关系较近,分离株XD1-2则与美国肠炎沙门菌分离株USA-EBQ1214032.1亲缘...     

兔体中和试验用猪瘟病毒阴、阳性血清国家参考品的研制

为制备和标定兔体中和试验用猪瘟病毒阴、阳性血清国家参考品,本试验制备了猪瘟病毒阴性、弱阳性和强阳性血清,通过过滤、分装、冻干、熔封,获得3亚批候选物,并进行了检验、协作标定和定值。结果显示：物理性状、无菌检验、安全检验、支原体检验、真空度测定、均匀性检验和保存有效期试验均合格;剩余水分均小于4％;特异性检验结果均为口蹄疫、伪狂犬病、猪繁殖与呼吸综合征、猪细小病毒病、牛病毒性腹泻／粘膜病抗体阴性,并且弱阳性和强阳性血清能中和猪瘟兔化弱毒而阴性血清不能中和;残余猪瘟病毒免疫荧光和套式RT—PCR核酸检测结果均为阴性;经协作标定定值,其兔体中和效价分别为：阴性、1：100.928±0.103、1：102.928±0.103,表明该候选物可以作为国家参考品。     

鸡白痢沙门氏菌阳性血清国家标准品制备用菌株的筛选

为了制备鸡白痢沙门氏菌阳性血清标准型国家标准品及鸡白痢沙门氏菌阳性血清变异型国家标准品,对中国兽医微生物菌种保藏管理中心保藏的10株来源背景清晰的鸡白痢沙门氏菌菌株的形态、生化特性、培养特性、血清学特性、抗原性进行了鉴定,并进行了变异检查及沙门氏菌基于inv A基因的PCR检测。结果表明,CVCC79201株及CVCC79207株分别符合鸡白痢沙门氏菌标准型菌株及变异型菌株的特性,CVCC79201株菌制备的抗原与WHO标准实验室提供的AntiS.Pullorum Serum(S)及Anti-S.Pullorum Serum(V)国际标准品的强阳性血清和弱阳性血清均能发生100%凝集,CVCC79207株菌制备的抗原与Anti-S.Pullorum Serum(S)国际标准品的弱阳性血清发生75%凝集,与Anti-S.Pullorum Serum(S)国际标准品的强阳性血清及Anti-S.Pullorum Serum(V)国际标准品的强阳性血清和弱阳性血清均能发生100%凝集。用其制备免疫抗原免疫家兔后获得的阳性血清效价较高于鸡白痢沙门氏菌阳性血清国际标准品。结果证明,CVCC79201株及CVCC79207株可分别用于制备鸡白痢沙门氏菌阳性血清标准型国家标准品及鸡白痢沙门氏菌阳性血清变异型国家标准品。     

改进试管凝集试验法检测布鲁氏菌病抗体

为证实改进的试管凝集试验（SAT）的使用价值,分别用微量试管凝集试验（MSAT）和SAT以国际标准血清为参比检测6份牛布鲁氏菌病阳性血清的抗体效价。结果表明：MSAT和SAT试验结果一致,而且MSAT具有稀释方法更简便、精确,省时省力,可节约血清、抗原等试验原材料,试验结果容易判定,重现性良好等优越性。     

沙门氏菌检测方法研究进展

畜禽饲用含有沙门氏菌的饲料,如果菌量达到一定数目,就可引起疾病或带菌,因此准确、快速地检测饲料中的沙门氏菌,对于防止畜禽和人类沙门氏菌污染具有十分重要的意义。传统沙门氏菌检测方法,由于其检测周期长、漏检率高、程序复杂、所需试剂繁多等缺点已远远不能满足现代检测要求。随着现代科学技术的不断发展,特别是免疫学、生物化学、分子生物学的不断发展,人们已创建了不少快     

Direct agglutination test for Encephalitozoon cuniculi

Encephalitozoon cuniculi is a small protozoan parasite in the phylum Microspora. It has been shown to naturally infect several host species, including humans. Infection with microsporidia is usually asymptomatic, except in young or immunocompromised hosts. Currently, serological diagnosis of infection is made using the indirect immunofluorescent antibody assay (IFA) or enzyme-linked immunosorbent assay (ELISA). Although these methods are sensitive and reliable, there are several drawbacks to the IFA and ELISA tests. Cross-reactivity between other Encephalitozoon species is common, and specialized equipment is required to conduct these tests. This paper reports the development of a direct agglutination test for detecting IgG antibodies to E. cuniculi. The utility of the agglutination test was examined in CD-1 and C3H/He mice infected with E. cuniculi or one of 2 other Encephalitozoon species. Test sera were incubated overnight with eosin-stained microsporidia spores in round-bottom microtiter plates. In positive samples, agglutination of spores with antibodies in test sera resulted in an opaque mat spread across the well. The results indicate that the agglutination test is 86% sensitive and 98% specific for E. cuniculi, with limited cross-reactivity to Encephalitozoon intestinalis. No cross-reactivity to Encephalitozoon hellem was observed. The test is fast and easy to conduct, and species-specific antibodies are not required.     

Latex agglutination test for canine parvovirus

Canine parvovirus (CPV) was detected in faeces from dogs with diarrhoea by a specific slide agglutination test using latex particles coated with anti-CPV monoclonal antibody (LA-anti-CPV). The agglutination of LA-anti-CPV with CPV on a glass slide was evident macroscopically within 2 min. The sensitivity of the latex agglutination (LA) test was similar to that of the hemagglutination test. The LA test is available for the rapid diagnosis of CPV infection at an animal hospital.     

Comparison of three commercial rapid agglutination test kits for identification of coagulase positive staphylococci from foods and animals.

Three rapid agglutination assays for the identification of Staphylococcus aureus Monostaph (Bionor A/S, Skien, Norway), Staphyslide-Test (BioMerieux, Lyon, France) and Staph-Rapid-Test (Roche, Basel, Switzerland), were compared. A total of 104 Gram-positive, catalase positive cocci were tested: Nineteen Staphylococcus reference strains comprising 15 spp. (4 strains were coagulase positive), and 7 Micrococcus reference strains comprising 4 spp.; 22 food isolates comprising 13 S. aureus, 8 coagulase positive Staphylococcus spp., and 1 Micrococcus sp.; 56 animal isolates comprising 11 S. aureus, 9 S. hyicus subsp. hyicus, 2 S. intermedius, 15 coagulase positive and 19 coagulase negative Staphylococcus spp. Totally 54 strains were coagulase positive. Considering agglutination of a coagulase positive strain as a correct identification, Monostaph, Staph-Rapid-Test, and Staphyslide-Test correctly identified 52 (96.3%), 47 (87.0%) and 48 (89.0%) of the coagulase positive staphylococci, respectively. Monostaph, Staph-Rapid-Test and Staphyslide-Test showed 1 (2.0%), 4 (8.0%) and 4 (8.0%) false positive reactions respectively. Monostaph, Staph-Rapid-Test and Staphyslide-Test gave 0 (0.0%), 6 (5.8%) and 7 (6.7%) non-interpretable reactions, respectively. Monostaph may be a good alternative to the tube-coagulase test for rapid and reliable identification of coagulase positive staphylococci from both food and veterinary sources. However, false negative reactions may occur with coagulase positive strains of S. hyicus subsp. hyicus and S. intermedius.