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1.
我国部分地区禽致病性大肠杆菌的分离鉴定与药敏试验 总被引：15，自引：2，他引：15
从山东、河南、江苏、辽宁、河北、广西等10余个省、市、自治区临诊上有典型大肠杆菌病病变的病禽2000多只采集病料，分离培养和鉴定出504株大肠杆菌。其中126株，经O血清型鉴定，除18株未能定型，7株自凝外，共鉴定出101个分离株的O血清型，这些分离株覆盖了31个血清型，但以O78、O2、O45、O109、O18、O8/O93、O107、O53、O154等10个血清型为主，共53株，占定型菌株的52．3％，前5种血清型在种类上只占定型菌株血清型的总数的16．1％，却拥有38个分离株，占定型菌株的37．6％。因此，可以认定O2、O78、O45、O109、O18等5个血清型为优势血清型。另外，融合株6个，占定型菌株5．9％，其中，O1／O154、O2／O86、O8／O93、O2／O78、O107／O154、O53／O80、O35／O107/O154、O4／O18／O142等为首次分离报道。药敏试验结果表明：82％的菌株对丁胺卡那霉素高敏，65％的菌株对头孢氨苄高敏，63％的菌株对壮观霉素高敏，50％的菌株对左旋氧氟沙星高敏，38％的菌株对新霉素和庆大霉素高敏。 相似文献
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大肠杆菌病是猪的重要细菌性疫病，它的发生形式为仔猪黄痢、仔猪白痢和仔猪水肿病三种形式。为了调查锦州地区猪大肠杆菌病的流行情况，从锦州地区的6个区县发病猪场采集36份疑似猪大肠杆菌病病料进行细菌的分离和生化鉴定，分离到致病性大肠杆菌30株。应用微量平板凝集试验，对分离的30株致病菌进行了血清型鉴定，鉴定出30株共有8种血清型O2、O5、O8、O60、O101、O138、O139、O141。致病性大肠杆菌菌株占疑似猪大肠杆菌病菌株的83．3％。该调查研究针对锦州地区防治猪大肠杆菌病菌苗和筛选防治猪大肠杆菌病敏感药物提供了依据。 相似文献
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鸡源大肠杆菌的血清型分布与耐药性监测 总被引：1，自引：0，他引：1
对180株鸡源大肠杆菌分离菌株进行O血清型鉴定，鉴定出171个分离菌株的O血清型40种，占分离菌株的95％，其中O36血清型的菌株最多，有40株，占定型菌株的23．9％，为优势血清型菌株。采用微量稀释法药敏试验监测了180株鸡源大肠杆菌分离菌株对20种抗菌药物的耐药性，结果表明，除头孢曲松、头孢氨噻肟、头孢噻呋、阿米卡星、氟苯尼考外，分离菌株对其余15种抗生素均呈现出不同程度的耐药性，其中，172株大肠杆菌分离菌株对两种或多种抗生素有耐药性，对萘啶酸的耐药率最高(93．3％)，其次是四环素(88．9％)、氨苄青霉素(72．8％)、阿莫西林(7l、7％)、罗比沙星(64.4％)、沙拉沙星(62．8％)。大多数分离株对氟喹诺酮类药物有很高的耐药率(52．9％～93．3％)，并表现出多重耐药性，124株分离株表现为对2种以上氟喹诺酮类药物的耐药性。 相似文献
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从天津各区主要养猪场分离的16株(7种血清型O20、O21、O139、O141、O93、O108、O147)大肠杆菌中提取外膜蛋白(OMP),经SDS-PAGE分析表明,5株O21菌株有2个OMP型(OMP-1和OMP-3型).3株O1s9菌株和3株O20菌株各出现2个OMP型(OMP-1和OMP-2型).2株O141菌株共出现2个OMP型(OMP-2和OMP-3).1株O93菌株、1株O108菌株和1株O147菌株均为OMP-1型.结果表明,相同血清型的菌株可以有不同的OMP型,不同血清型的菌株可以有相同的OMP型. 相似文献
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从天津各区主要养猪场分离的16株（7种血清型O20，O21，O139，O141，O93，O108，O147）大肠杆菌中提取外膜蛋白（OMP），经SDS－PAGE分析表明，5株O21菌株有2个OMP型（OMP－1和OMP－3型），3株130菌株和3株O20菌株各出现2个OMP型（OMP－1和OMP－2型），2株O141菌株共出现2个OMP型（OMP－2和OMP－3）。1株O93菌株，1株O108菌株和1株O147菌株均为OMP－1型，结果表明，相同血清型的菌株可以有不同的OMP型，不同血清型的菌株可以有相同的OMP型。 相似文献
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从河北的三河、滦南、乐亭、卢龙及昌黎等地 2 9个养鸡场 (户 )分离鉴定了 82株病原大肠杆菌 ,用 54种常见动物病原大肠杆菌单价 O抗血清进行了血清型鉴定。结果 82株分离菌有65株被鉴定出了相应 O血清群 (占鉴定菌株的79.2 6%) ,分属 6种不同血清型 ,其中以 O78和O45两种为优势血清型 (占定型菌株的64.61 %) ,其余 4种 O血清群占定型菌株的 3 5.3 9%,尚有 1 7株未能定型 (占鉴定菌株的 2 0 .74%) 相似文献
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青海省规模化猪场仔猪水肿病病原的分离鉴定 总被引：1，自引：1，他引：0
从青海省西宁及海东各县养猪场送检及搜集的发生典型仔猪水肿病的死亡猪肝脏和肠系膜淋巴结，分离鉴定出48株溶血性大肠杆菌，用25种大肠杆菌O抗原单价血清进行了血清学鉴定。结果表明：48株分离菌有32株能定型，分属6种血清型，其中以O8(11／32)、O139(8／32)、O149(6／32)、O141(5／32)4种为优势血清型。同一猪场存在多种血清型，大多数猪场有本场的优势血清型；同一地区的不同猪场流行的主要血清型一般不同；不同地区猪场的优势血清型有的相同，有的不同。 相似文献
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对鸡大肠杆菌进行分离鉴定，分离出的56株大肠杆菌中，共鉴定出47株菌株的血清型，分属O1、O2、O5、O35、O78、O1116种不同O抗原血清型，占分离菌株的83．9％。其中O1、O2、O78、O111最常见，占已定型菌株83％。同时，进行了药敏试验，为药物防治提供依据。 相似文献
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采集青海省共和县不同地区4个猪场仔猪粪样316份,并采用玻板凝集法进行了O抗原血清型鉴定。结果发现:316份仔猪粪样经分离鉴定出致病性大肠杆菌176株,155株鉴定出抗O血清型。该地区流行优势血清型为O11(13株)、O60(12株)、O119(10株)、O137(9株)、O141(10株)、O144(12株)、O147(12株)和O149(8株),分别占8.38%、7.74%、6.45%、5.81%、6.45%、7.74%、7.74%和5.16%。8种优势血清型占总定型菌株的53.5%(83/155)。 相似文献
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奶牛粪样中致病性大肠埃希菌的分离与鉴定 总被引：1，自引：0，他引：1
大肠埃希菌血清型众多,一些具有特殊血清型的大肠埃希菌对人和动物有致病性。本试验从包头市侯家营奶牛场77头外表健康成年泌乳荷斯坦奶牛采集新鲜粪样,进行细菌分离培养,共分离到疑似大肠埃希菌69株,经过形态观察、生化鉴定、动物致病性试验和血清型鉴定,其中12株为致病性大肠埃希菌,均为强毒株,占分离菌数的17.4%,另57株为非致病性大肠埃希菌,占分离菌数的82.6%。同时对12株致病性大肠埃希菌进行了"O"血清型鉴定,分属7种血清型O78、O6、O9、O98、O1、O8、O149,分别占定型菌株的25.0%(3/12)、8.3%(1/12)、16.7%(2/12)、8.3%(1/12)、8.3%(1/12)、8.3%(1/12)、25.0%(3/12)。 相似文献
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Duplex real-time PCR assays were used as modules to cover partially automated detection of 12 genes encoding adhesins, enterotoxins and Shiga toxins in faecal E. coli isolates. For this a total of 194 E. coli isolates from pigs suffering from post-weaning diarrhoea (PWD), including 65 isolates with haemolytic activity, and 83 isolates from calves with diarrhoea were examined. Data obtained by PCR were compared with O-typing and with haemolytic activity as indirect virulence markers. E. coli O-types O139:K82, O141:K85, and O149:K91 accounted for 43.8% (n = 85) of all porcine strains and for 55.4% (n = 36) of the porcine strains, which exhibited haemolytic activity. These strains carried virulence genes by 65.9% (n = 56) and 80.6% (haemolytic E. coli, n = 29), respectively. The E. coli O-types O139:K82 and O141:K85 were significantly associated with the adhesin gene F18, and O149:K81 with the F4 gene. In this context, detection of the gene encoding F18 was coupled predominantly with the genes responsible for the production of the toxins ST-I, ST-II and Stx2, and the F4 gene with those of the enterotoxins ST-I, ST-II and LT. Both virulence patterns were detected more pronounced in E. coli strains with haemolytic activity. Fifty-six of a total of 83 E. coli isolates originating from calves were O-typed as O101 (O101:K28, O101:K30, O101:K32; n = 29), O78:K80 (n = 23), and O9:K35 (n = 4). Most of the E. coli O78:K80 strains carried the F17 gene (69.6%, n = 16). Virulence genes encoding for F4, F5 or ST-I were detected only in single cases. Intimin and Shiga toxin genes that are present in enterohaemorrhagic E. coli (EHEC) were not detected. 相似文献
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We tested hemolytic E. coli from 86 pigs with edema disease or colidiarrhea. They were tested serologically and with nonradioactive digoxigenin-dUTP labelled probes for the presence of enterotoxin or Shiga-like-toxin genes. By slide-agglutination we detected 38 cases with E. coli O149:K88, 28 with E. coli O139:82B and 20 with E. coli O141. E. coli of serogroup O149:K88 isolated from diarrheic pigs, reacted with the probes for LT and STb genes. Edema disease E. coli O139:82B reacted with the SLTII probe. E. coli O141, isolated from colidiarrhea or edema disease showed a diversity of toxin gene patterns. All the E. coli O141 from diarrheic pigs reacted with the probes for LT and STap in addition to SLTII. No strains isolated from pigs with edema disease possessed any of these enterotoxin genes. Gene probe technique confirmed the serological method as useful tool for diagnosing E. coli O149:K88 and O139:82B as ETEC or VTEC, respectively. On the other hand only the demonstration of toxin genes with probes could explain the pathological findings in the pigs shedding E. coli of serogroup O141. 相似文献
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Vu-Khac H Holoda E Pilipcinec E Blanco M Blanco JE Dahbi G Mora A López C González EA Blanco J 《Veterinary journal (London, England : 1997)》2007,174(1):176-187
Two hundred and fifty Escherichia coli isolates from diarrhoeic and healthy piglets were serotyped and tested for the presence of virulence genes for fimbriae, intimin, heat-labile (LT) and heat-stable (STa and STb) enterotoxins, Stx toxins, and enteroaggregative heat-stable 1 (EAST1) enterotoxin by polymerase chain reaction (PCR). Although 220 isolates from diarrhoeic piglets belonged to 43 O serogroups and 77 O:H serotypes, 60% were of one of the 10 serogroups O2, O8, O15, O54, O84, O101, O141, O147, O149 and O157, and 60% belonged to only 10 serotypes (O8:H-, O54:H-, O84:H7, O101:H-, O141:H-, O141:H4, O147:H-, O149:H10, O163:H-, and ONT:H-). PCR showed that 79% of 220 isolates carried genes for at least one of the virulence factors tested. The gene encoding for EAST1 was the most prevalent (65%) followed by those encoding for STb (49%), LT (42%), STa (13%), and Stx2e (4%). Eighty-three (38%) of the 220 E. coli isolates carried the gene for F4 (K88), whereas genes for F18, F5 (K99), F41, F6 (P987), F17, and intimin (eae) were detected in 9%, 3%, 3%, 3%, 1%, and 3%, respectively. Seropathotype O149:H10:F4:LT/STb/EAST1 (70 isolates) was the most common, representing 32% of isolates. Pulsed-field gel electrophoresis (PFGE) analysis with XbaI of 15 O149:H10 representative isolates from diarrhoeic piglets distinguished 14 types. The 15 isolates exhibited a wide variability of distinct restriction patterns though all belonged to the same serotype (O149:H10), and all but one showed identical virulence determinants (F4, LT, STb, and EAST1). Among 30 isolates from healthy piglets only two virulence genes were detected: EAST1 (26%) and eae (17%). In total, 12 isolates were positives for the eae gene: five isolates had intimin beta1, four possessed intimin theta and three showed intimin type xiB. This is believed to be the first study describing the presence of intimin type xiB in E. coli of porcine origin. 相似文献
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To investigate the cause of piglets diarrhea, and the distribution of the serotype and virulence factors of swine Escherichia coli in Beijing, 400 diarrhea samples were collected. TSA serum agar culture method was used to isolate Escherichia coli, serotype identification test and virulence factor genes test were used to verify the presence of O-antigen. 64 strains of E.coli were isolated from 400 diarrhea samples, among which 42 strains of E.coli were classified as 8 serotypes:O101(18.7%),O64(12.5%),O8(10.9%),O20(10.9%),O45(4.7%),O149(4.7%),O2(1.6%) and O89(1.6%), and the major virulence factors were STa, Stx2e, astA and eaeA. There were 8 mainly serotypes that caused piglets diarrhea in Beijing area, among which O101 serotype accounted for the highest proportion. The major virulence factors were astA and eaeA, accounted for more than 50% of all strains, STa and Stx2e accounted for more than 30% of all strains. These data would provide effective data to support the prevention and control of piglet diarrhea in Beijing. 相似文献
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本试验旨在调查北京地区仔猪腹泻的原因及猪源大肠杆菌血清型、毒力因子的分布情况。收集北京京郊地区仔猪腹泻样本400份,应用含2%血清的TSA培养基分离大肠杆菌,通过血清型鉴定试验和毒力因子检测验证O抗原。结果显示,400份样本中分离到64株大肠杆菌,定型42株。其主要为O101型（18.7%）、O64型（12.5%）、O8型（10.9%）、O20型（10.9%）、O45型（4.7%）、O149型（4.7%）、O2型（1.6%）、O89型（1.6%）8种血清型,其携带的毒力因子为STa、Stx2e、astA和eaeA等。结果表明,引起京郊仔猪腹泻的大肠杆菌主要有8个血清型,其中O101型发病比例最高。其携带的毒力因子主要为astA和eaeA,占全部菌株的50%以上,STa和Stx2e因子占全部菌株的30%以上。本试验结果将为今后京郊地区仔猪腹泻病的防控提供有效的数据支持。 相似文献
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Background
Oedema disease is a severe disease, mainly affecting recently weaned pigs. It is caused by E. coli strains that express fimbriae F18 and produce verotoxin 2e, mainly belonging to serotype O138, O139 or O141. The aim of this study was to compare E. coli isolates within these serotypes with respect to diversity.Methods
Faecal E. coli strains belonging to serotypes O138, O139 and O141 isolated during the period 1994–1998 from Swedish pigs aged less than 12 weeks were compared using a biochemical fingerprinting system. Aiming to compare the results obtained over time, also strains isolated during 1964–67 and 1975–80 were included in the study. The study comprised 129, 263 and 95 isolates of E. coli serotype O138, O139 and O141, respectively.Results
Biochemical phenotypes (BPTs) were defined. At each sampling occasion each herd could only contribute with one isolate per BPT. Consequently, all but one of identical BPTs identified at a specific sampling occasion was omitted. The final number of isolates from 1994–98 that was compared included 64, 182 and 41 isolates of serotypes O138, O139 and O141, respectively. Within each serotype, the dominating BPT included over 65% of the compared isolates, demonstrating a large dominance of one BPT per serotype. These dominating BPTs were also demonstrated in the material from the 1960ies and the 1970ies. Still, the presence of other common BPTs (especially within serotype O138 and O139) demonstrated a certain variation within serotype. In a herd severely affected by oedema disease, E. coli serotype O139 was easily demonstrated in diseased pigs but only rarely in apparently healthy weanersConclusion
The results obtained demonstrate the presence of dominating BPTs within the oedema disease inducing serotypes. A stability of these BPTs over time was observed, presumably at least partly due to a never-ending access to naïve pigs. Still, the presence of other common BPTs indicates a variation over time, which visualises the importance of monitoring for this. Such studies should focus on pigs affected by oedema disease, because oedema disease inducing strains of E. coli were only rarely demonstrated in healthy pigs in a herd affected by oedema disease. 相似文献19.
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D Ciosek M Truszczy&#x;ski M Jagodzi&#x;ski 《Comparative immunology, microbiology and infectious diseases》1983,6(4):313-319
Different vaccines against Escherichia coli diarrhea of piglets were applied parenterally in pregnant sows at an industrial fattening farm. The following vaccines were used: vaccine No. 1 with non-complete Freund's adjuvant. Tween 80 and Arlacel A, comprising O149:K91,K88; O139:K82; O8:K87,K88; O141:K85,K88; and O64:K? E. coli serotypes; vaccine No. 2 with paraffin oil instead of Freund's adjuvant, comprising the same E. coli serotypes as the vaccine No. 1; stable specific vaccine with 10% aluminium hydroxide, based on E. coli serotypes most frequently isolated from piglets which died at the farm (O149:K91,K88; O8:K87,K88; O20:K17; O64:K?); Gletvax K88 (Wellcome) and NOBI-VAC LT-K88 (Intervet International). The number of piglets which died up to the moment of weaning in comparison to the number of born ones was considered as an indicator of acquired protection. It was found that the most effective in conferring protection against E. coli diarrhea were: vaccine No. 1 and NOBI-VAC. The differences in the mortality rate between piglets originating from sows vaccinated with these vaccines and those from unvaccinated ones were statistically significant (P < 0.05). No significant differences were noted between controls and animals vaccinated with the remaining vaccines. 相似文献