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1.
为试验鸡大肠杆菌病中草药佐剂多价灭活疫苗而进行了制造和检验用菌种的选育试验。经染色特性、培养特性、生化特性及血清学特性等的观察和测定，选用Ａ、Ｂ、Ｃ、ＳＥ４株血清型分别是Ｏ１、Ｏ２、Ｏ７８及Ｏ２４的鸡Ｅ．ｃｏｌｉ作为标准菌株，现地分离和鉴定有代表性疫区或病鸡群病原血清型作为地方菌株，经毒力和免疫原性测定，结果证实，该４株血清型大肠杆菌作为疫苗制造和检验用菌种较好，并分别进行了冷冻真空干燥保存试验， 相似文献
2.
鸡大肠杆菌病多价灭活苗的菌种选择和冻干保藏 总被引：2，自引：0，他引：2
８０年代以来，鸡大肠杆菌病（ｃｈｉｃｋｅｎｃｏｌｉｂａｃｉｌｌｏｓｉｓ）几乎遍及所有的商业鸡群，给养鸡业带来较大的直接和间接经济损失。根据鸡致病性大肠杆菌（Ｅ．ｃｏｌｉ）易产生耐药性和抗原血清型多样性的特点，辽宁省益康生物制品厂自１９９４年起，为试制鸡大肠杆菌病中草药佐剂多价灭活疫苗，进行了系统鉴定和筛选，并对菌种冻干保存条件进行了研究，现报道如下。１ 材料鸡致病性Ｅ．ｃｏｌｉ冻干菌种Ａ、Ｂ、Ｃ，由中国兽药监察所提供；斜面菌种ＳＥ，由解放军农牧大学提供。ＳＢ１－２、Ｂ２－１及其他菌株，为本地区病… 相似文献
3.
成都地区鸡大肠杆菌病病原分离鉴定及血清型调查 总被引：7，自引：0，他引：7
本试验从成都及毗邻十二个县（市）部分养鸡场（户）送检的疑似鸡大肠杆菌病的病鸡中分离出的５４３株鸡致病性大肠埃希氏病，取其中６９株进行血清型鉴定，其血清型分别为Ｏ７８：Ｋ８０，Ｏ５５，Ｏ２，Ｋ３，Ｏ８：Ｋ４０，Ｏ１２５：Ｋ７０，Ｏ１：Ｋ１，Ｏ２６：Ｋ６０，Ｏ１４２：Ｋ８６，Ｏ２９，Ｋ１２７ａ：Ｋ６３及Ｏ１６４。其中Ｏ１２５：Ｋ７０，Ｏ１４２：Ｋ８６及Ｏ１２７ａ：Ｋ６３血清型的Ｅ，Ｃｏｌｉ使鸡致病的剖 相似文献
4.
为确认我区流行的鸡大肠杆菌（Ｅ、Ｃｏｌｉ）血清型，并为我区研制鸡大肠杆菌多价灭活苗提供对应的菌株，我们从现地典型病例中采集４９份病料，经接种培养、分离病原、细菌形态学及染色特性检查、生化试验、致病性试验、血清型鉴定和抗原性测定等一系列试验，确定其中４１份病料（占８３．７％）为致病性大肠杆菌。通过血清型鉴定认定我区目前流行的Ｅ、ｃｏｌｉ有１１个血清型。其中，毒力最强血清型５个，即ＥＨＹ－１０为Ｏ７８；ＥＨＹ－２８为Ｏ１５；ＥＨＹ－３０为Ｏ６６；ＥＨＹ－４６为Ｏ７；ＥＨＹ－４７为Ｏ１２０。广泛发生的为Ｏ７占１８．２％，Ｏ１及Ｏ７８各占１３．６％。其中Ｏ１２０为国内尚未见报道的新发现血清型。为证实我们分离鉴定菌型的准确性，经送中国兽药监察所５份病料，其鉴定结果与我们鉴定的结果一致 相似文献
5.
肠出血性大肠杆菌（ＥＨＥＣ）Ｏ１５７∶Ｈ７的研究近况潘玲（综述）吴信法（审校）（安徽农业大学合肥２３００３６）肠出血性大肠杆菌（ＥＨＥＣ）包括一些与出血性结肠炎有关的，并能产生Ｖｅｒｏ细胞毒素的大肠杆菌（ＶＴＥＣ）。ＶＴＥＣ培养物的滤液能使Ｖｅｒｏ细... 相似文献
6.
彭新宇 《广东畜牧兽医科技》1994,(2)
壮观霉素对１日龄小鸭埃希氏大肠杆菌感染的治疗效果ＭａｒｉｓｕｅＦｒｅｅｄ等著彭新宇摘译大肠杆菌病是一种危害多种家禽，（尤其是鸡、火鸡和鸭）的严重疾病。其病原是埃希氏大肠杆菌（Ｅ．ｃｏｌｉ），Ｅ．ｃｏｌｉ在动物肠道中广泛存在，但一般只有致病性血清型才会... 相似文献
7.
养鸡技术讲座第六十九讲鸡大肠杆菌病彭德旺，葛兆宏，王涛，黄秀萍，罗羊桂（江苏省畜牧兽医学校，江苏省泰州市畜牧兽医站）鸡大肠杆菌病是大肠埃希氏菌（ＥｓｃｈｅｒｉｃｈｉａＣｏｌｉ）的某些血清型所引起的一类疾病的总称。包括大肠杆菌性败血症、气囊炎、心包炎、... 相似文献
8.
畜禽多发病及其防治——鸡大肠杆菌病谢家声蔡应奎（中国农业科学院兰州畜牧与兽药研究所兰州７３００５０）（国营亻条山鸡场鸡大肠杆菌病（Ｃｈｉｃｋｅｎｃｏｌｉｂｏａｅｉｌｏｓｉｓ）是由某些血清型的大肠埃希氏菌（Ｅｓｃｈｅｒｉｃｈｉａｃｏｌｉ）所引起的一类疾... 相似文献
9.
从疑似PRRS流产胎儿分离PRRSV的研究 总被引：276，自引：4，他引：272
采用猪肺巨噬细胞和Ｍａｒｃ－１４５细胞培养对国内暴发流行ＰＲＲＳ的某地猪场进行了病毒分离，从流产胎儿分离出特征性致细胞病变因子，用ＰＲＲＳＶＳＤＯＷ－１７单克隆抗体进行间接免疫荧光染色，证明从４头流产胎儿分离到４株ＰＲＲＳＶ（ＣＨ－ｌａ，ＣＨ－１ｂ，ＣＨ－ｌｃ，ＣＨ－ｌｄ）这４株毒均可在猪肺巨噬细胞和Ｍａｒｃ－１４５ 细胞上生长，并产生特征性ＣＰＥ变化，用ＰＲＲＳＶ美国分离毒株ＶＲ－２３３２和ＮＶ 相似文献
10.
综合防制鸡大肠杆菌病夏心富（江苏省宝应县畜牧兽医站２２５８００）鸡大肠杆菌病是由大肠埃希氏菌（Ｅｓｃｈｅｒｉｃｈｉａ，Ｃｏｌｉ）的某些血清型所引起的一类疾病的总称，近年来，随着我国集约化养禽业的发展，大肠杆菌病已成为危害我国养禽业的主要疾病之一，引起... 相似文献
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12.
These experiments determined the ability of Escherichia coli O157:H7 to colonize and persist in pigs simultaneously inoculated with other pathogenic E. coli strains. Three-months-old pigs were inoculated with a mixture of five E. coli strains. The mixture included two Shiga toxigenic E. coli (STEC) O157:H7 strains, two enterotoxigenic E. coli (ETEC) strains and one enteropathogenic E. coli (EPEC) strain. A high dose mixture with all five strains at 10(10)CFU/animal (CFU: colony forming units) and a low dose mixture with the STEC strains at 10(7)CFU and the EPEC and ETEC strains remaining at 10(10)CFU were used. The STEC strains persisted in the alimentary tracts of some pigs at 2 months post-inoculation, following inoculation with both the high and low dose mixtures. When all strains were given at 10(10)CFU (high dose) the STEC strains persisted in greater numbers and in more pigs than did the other E. coli strains. The results demonstrated that persistent colonization (> or =2 months) by E. coli O157:H7 can occur in pigs. These findings were similar to those reported from sheep inoculated with the same mixture of E. coli strains. The results are consistent with reports suggesting that pigs have the potential to be reservoir hosts for STEC O157:H7. 相似文献
13.
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
14.
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
15.
对从天津地区分离到的71株鸡大肠杆菌的部分生物学特性包括致病性、血清型、耐药特性和免疫原性等进行了研究。结果表明其中60株为致病性菌株,占分离菌株的84.5%;60个致病性菌株共定型出45个菌株,分属O1、O2、O5、O6、O20、O45、O53、O74、O75、O78、O88、O89、O92、O107、O111、O145等16个血清型,其中O78、O88、O2、O45、O53和O145为优势血清型,占定型菌株的73.4%;试验菌株具有广泛的耐药性,60个致病性菌株均为多重耐药。免疫原性测定试验结果表明,O2、O78、O88血清型菌株均可对相同血清型菌株提供很好的保护,但3个血清型菌株之间缺乏有效的保护。 相似文献
16.
A cross-sectional study was conducted to determine the prevalence and characteristics of verocytotoxigenic Escherichia coli (VTEC) on 25 dairy farms each located in Waller field and Carlsen field farming areas in Trinidad. On each selected farm, faecal samples were collected from milking cows, calves and humans; rectal swabs were obtained from pet farm dogs; bulk milk was sampled as well as effluent from the milking parlour. Escherichia coli was isolated from all sources on selective media using standard methods. Isolates of E. coli were subjected to slide agglutination test using E. coli O157 antiserum, vero cell cytotoxicity assay to detect verocytotoxin (VT) and heat labile toxin (LT) production, the polymerase chain reaction (PCR) to detect VT genes, and the dry spot test to screen for E. coli O157 and non-O157 strains. In addition, faecal samples from animal and human sources were tested for VT genes using PCR. Of a total of 933 E. coli isolates tested by the slide test, eight (0.9%) were positive for the O157 strain. The vero cell cytotoxicity assay detected VT-producing strains of E. coli in 16.6%, 14.6%, 3.2% and 7.1% of isolates from cows, calves, farm dogs and humans respectively (P < 0.05; chi(2)). For LT production, the highest frequency was detected amongst isolates of E. coli from calves (10.8%) and the lowest (0.0%) amongst isolates from humans and bulk milk (P < 0.05; chi(2)). Of the 61 VT-producing isolates by vero cell cytotoxicity assay tested by PCR, the VT, LT and eae genes were detected in 62.3%, 4.9% and 1.6% respectively (P < 0.05; chi(2)). Amongst the 45 E. coli isolates that were VT positive (vero cell) or VT-gene positive by PCR, 2.2%, 2.2%, 4.4% and 6.7% belonged to non-O157 strains O91, O111, O103 and O157, respectively, as determined by the Dry spot test. Detection of VTEC strains in milk and dairy animals poses a health risk to consumers of milk originating from these farms. In addition, the demonstration of VTEC strains in humans, VT gene in faecal samples and E. coli isolates as well as non-O157 VTEC strains of E. coli are being documented for the first time in the country. 相似文献
17.
Mercado EC Rodríguez SM D'Antuono AL Cipolla AL Elizondo AM Rossetti CA Malena R Méndez MA 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2003,50(1):8-13
CS31A is a K88-related non-fimbrial adhesin first described on Escherichia coli strains isolated from diarrhoeic and septicaemic calves. In this report, CS31A antigen was screened by immunological methods and confirmed by PCR among bovine E. coli isolates. In addition, CS31A-producing strains were characterized with respect to different fimbrial antigens, O-serogroup and other properties related to virulence. Faecal or tissue specimens of 100 diarrhoeic or septicaemic calves and 27 older cattle with different pathologies from 71 outbreaks or individual cases that occurred in Buenos Aires province, Argentina, were examined. CS31A + E. coli strains were isolated from 21 (21.0%) calves from 16 outbreaks or individual cases. No CS31A + E. coli was detected in samples from cattle more than 1 year old. Fimbriae F5, F41, F17a and F17b were not detected among the CS31A-producing strains. Three (14.3%) of the CS31A+ E. coli strains expressed the F17c fimbria. All of the 21 isolates exhibited at least one property of septicaemic strains (resistance to serum, production of aerobactin or colicins) but none of them demonstrated heat-stable enterotoxigenic activity. CS31A + E. coli isolates belonged to 10 serogroups, more commonly O8, O7, O17 and O21. The results obtained here confirm the worldwide distribution of CS31A antigen in bovine E. coli strains. However, CS31A + or CS31A + /F17c + E. coli were less frequently isolated than they were in North hemisphere countries. 相似文献
18.
为调查新疆部分地区E.coli O157：H7的感染情况和菌株致病性,从新疆阿克苏、伊犁、塔城3个地区的牛场采集新鲜粪样564份,对E.coli O157：H7进行分离与鉴定。利用E.coli营养肉汤（EC肉汤）对样品进行增菌后,用山梨醇麦康凯培养基（SMAC）平板选择性培养,再经过4-甲基伞形酮-β-D葡萄糖醛酸苷培养基（MUG）的筛选,对疑似菌株进行生化和PCR鉴定,并将分离鉴定到的菌株进行小鼠攻毒试验。结果显示,从伊犁地区采集的样品中共分离出2株E.coli O157：H7（Y166和Y226）,其检出率为0.88%;小鼠攻毒试验中,Y166和Y226试验组小鼠在48 h内全部死亡,具有一定致病性;从阿克苏、塔城所采样品中未分离到E.coli O157：H7。 相似文献
19.
SU Zhanqiang WANG Dong ZHANG Jinyu ZHANG Yi LIU Yingyu MA Kaiqi GAO Jiaojiao SUN Xue YAO Gang 《中国畜牧兽医》2018,45(1):212-218
To study the impact of season to the distribution of bovine E.coli O157:H7,samples of anus swabs (399),feces (68),water (29) and feed (43) were collected in the spring, summer,autumn and winter from A,B and C farms of Xinjiang. After enrichment by EC broth, SMAC and MUG selective culture were then performed. Finally,PCR was used for identification and virulence gene detection of isolated strains. A total of 5 E.coli O157:H7 strains were isolated from 539 samples from three farms (0.93%,5/539), 2 of them were from spring (1.44%,2/139),1 from autumn(0.56%,1/180),2 from winter (1.38%,2/145) and no strains were isolated from summer samples. One strain were isolated from anus swab samples in farm B (0.69%,1/145) and one were isolated from anus swabs (0.66%,1/152) and three strains were isolated from feed samples in farm C (20.00%,3/15),and no target strains were isolated from water samples. The distribution of bovine E. coli O157:H7 had obvious seasonal characteristics.One E.coli O157:H7 strain of farm B was isolated from autumn and four of farm C were from isolated spring (2 strain) and winter (2 strain),and the isolation rate of E. coli O157:H7 in spring and winter were higher than that in summer and autumn. In conclusion,under the special climate characteristics and feeding mode in Xinjiang,to prevent and control the spreading of E. coli O157:H7 of cattle,we must pay great attention on hygiene management of pens at cold season, specially avoiding the feed contaminated by feces. 相似文献
20.
病死雏鸡的病原分离鉴定 总被引：3，自引：0，他引：3
从送检的３１只病死雏鸡中分离出３０株致病菌，其中沙门氏杆菌２７株，分离率９０％，大肠杆菌６株，分离率２０％。对其中５株沙门氏杆菌和４株大肠杆菌进行了系统生化鉴定及血清型鉴定，证实５株沙门氏菌中鸡白痢沙门氏杆菌占６０％（３／５），鸡伤寒沙门氏杆菌占４０％（２／５），４株大肠杆菌中Ｏ２２株，Ｏ６１株，Ｏ１１５１株。对分离菌进行了雏鸡致病力及抗菌药物敏感性试验，提出了相应的预防对策 相似文献