共查询到19条相似文献，搜索用时 140 毫秒
1.
为了确定石河子地区规模化羊场出现呼吸道症状死亡羊的细菌性病原,采用常规细菌分离鉴定方法、细菌16SrRNA序列分析以及多杀性巴氏杆菌特异性基因kmt,从病变肺组织分离鉴定细菌,利用5个荚膜血清型特异性基因确定其血清型,扩增分离株的16个毒力相关基因,分析分离菌致病性和对常用抗菌药物的耐药性。结果表明,从病羊的病变肺组织中分离鉴定到一株血清D型多杀性巴氏杆菌,具有较强的致病性;携带8个毒力相关基因,其片段序列与NCBI上己公布的多杀性巴氏杆菌参考株同源性在99%以上;分离株对青霉素、林可霉素、庆大霉素、复方新诺明耐药,对其他23种药物敏感。 相似文献
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牛源荚膜血清A型多杀性巴氏杆菌的分离鉴定 总被引：9，自引：4，他引：5
从采集于黑龙江、天津的病牛肺组织中分离到2株病原菌,经菌落形态学观察、培养特性、生化反应和小鼠毒力试验,初步鉴定为多杀性巴氏杆菌,分别命名为Pm-HLJ和Pm-TJ.参考多杀性巴氏杆菌种特异性基因kmt1和荚膜血清型特异性基因hyaD-hyaC、bcbD、dcbF、ecbJ和fcbD,合成引物,通过多重PCR扩增2株菌的种特异性基因和荚膜血清型特异性基因.选取Pm-HLJ的目标PCR产物进行克隆、序列测定、Blast搜索同源序列并且比较分析.结果显示,Pm-HLJ的kmt1基因片段全长460 bp,与GenBank中各血清型kmt1基因同源性均在96.6%以上;荚膜血清型A菌株特异性基因同源性为99.9%;而与其他荚膜血清型B、D、E、F的型特异性基因的同源性均低于50%.由此确认,分离的2株多杀性巴氏杆菌均为荚膜血清A型,这是我国A型多杀性巴氏杆菌引发牛出血性败血症的首例报道. 相似文献
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犊牛肺炎多杀性巴氏杆菌的分离与鉴定 总被引：3，自引：0，他引：3
新疆石河子6个规模化奶牛场相继出现出生1～9周龄的犊牛发生体温升高、呼吸困难以肺部感染为主,部分犊牛发生腹泻的疾病,造成90余头犊牛因肺炎死亡.从其中2个发病牛场死亡犊牛采集痛料,经涂片镜检、细菌分离培养、生化鉴定及动物试验,初步鉴定为多杀性巴氏杆菌,分别命名为Pm142-x-3、Pm142-x-4、Pm149-xby、Pm149-x,参考多杀性巴氏杆菌种特异性基因kmtl和荚膜血清型特异性基因hyaD-hyaC、bcbD、dcbF、ecbJ和fcbD序列,合成引物,进行PCR扩增.选取Pm149-x-3的目标PCR产物进行序列测定并分析比较,结果表明,Pm149-x-3的kmtl基因片段全长为460 bp,与GenBank中各血清型kmtl基因核苷酸同源性为99.4%;荚膜血清型A菌株特异性基因核苷酸同源性为97%;而扩增其他荚膜血清型B、D、E、F的型特异性基因均未获得目的条带.由此确认,分离的4株多杀性巴氏杆菌均为荚膜血清A型.药敏试验表明分离的多杀性巴氏杆菌对氧氟沙星、庆大霉素敏感. 相似文献
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从病死母猪肺脏中分离到一株革兰氏阴性小杆菌,用生理生化鉴定、药敏试验、致病性试验和PCR鉴定方法对分离菌株进行鉴定,并用多杀性巴氏杆菌荚膜分型引物对分离株的荚膜血清型进行鉴定。结果表明:本菌为猪多杀性巴氏杆菌,对多种抗生素高度敏感,对小白鼠有强致病性;PCR扩增16SrDNA基因获得1415bp片段,分离株的16SrDNA核苷酸序列与多杀性巴氏杆菌(AY078999)的同源性为99%,因此该分离菌株被鉴定为致病性巴氏杆菌,命名为YN20110122株;本菌分离株为荚膜A型血清型多杀性巴氏杆菌。 相似文献
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为鉴定一株从雁鸭脏器内分离到的革兰氏阴性细菌,本研究对该菌进行分离培养、细菌16S rRNA序列比对、动物试验和药物敏感性试验。结果表明该分离菌与多杀性巴氏杆菌(P.mutocida)(AF224297)同源性达99.88%,毒力强,能够致死家兔、小鼠和鸡,对氧氟沙星等药物敏感。分离菌的荚膜抗原血清型特异性基因PCR产物与荚膜血清A型P.mutocida hyaD-hyaC基因同源性达99.9%,确定该菌株为荚膜血清A型P.mutocida。本研究首次从雁鸭体内分离到A型P.mutocida。 相似文献
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《黑龙江畜牧兽医》2017,(23)
为了研究引起青海省海西州漠河骆驼场安格斯种牛致死病因及其病原特征,试验以C47-8为质控菌株,采用常规细菌分离鉴定技术对无菌采集的病死安格斯种牛病料进行了多杀性巴氏杆菌的分离与纯化、生化鉴定、致病性试验、药敏试验及其种特异性基因Kmt-1的检测。结果表明:临床分离株为革兰氏阴性的短杆菌,病料触片经美蓝染色镜检可见其呈两极着色特性;与C47-8间存在乳糖、蔗糖、木糖、水杨苷及尿素酶等5种生化鉴定差异;对小鼠具有致死性效应;对红霉素等22种抗生素耐药,平均耐药率为62.85%(22/34),而质控菌株则无耐药性。同时对提取的临床分离株DNA进行Kmt-1基因的PCR扩增,分别获得了大小为460 bp和253 bp的Kmt-1基因扩增片段;经序列分析,临床分离株Kmt-1基因与Gen Bank公布的序列之间的基因编码区核苷酸序列同源性为97%~100%;检测的最低DNA浓度为790 ng/m L;所应用的2对Kmt-1基因检测引物对伤寒沙门氏菌、大肠埃希氏菌和克雷伯氏菌的扩增均为阴性。说明此次安格斯种公牛发病为多杀性巴氏杆菌引起,建议该养殖场在做好饲养管理的同时,应加强针对多杀性巴氏杆菌的免疫预防和消毒处理措施,以减少或杜绝本病的再次发生。 相似文献
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《中兽医医药杂志》2019,(4)
从病死牛组织中分离到4株致病菌,编号分别为P1、P2、P3、P4。经菌落形态学观察、培养特性、生化反应和小鼠毒力试验,初步鉴定为多杀性巴氏杆菌。参考多杀性巴氏杆菌16S rRNA和种特异性kmt1基因以及荚膜血清型基因A(capA)、B(capB)、D(capD)、E(capE)和F(capF)合成引物,利用多重PCR扩增16S rRNA、kmt1和荚膜血清型基因,对PCR产物测序并进行同源性分析。结果显示,P1～P4都扩增出了16S rRNA、kmt1和荚膜血清型A型基因的特异性目的条带;P1～P4的16S rRNA、kmt1、A型基因序列与Genbank数据库中的多杀性巴氏杆菌相应序列具有高度同源性(99.0%);P2、P3、P4间的16S rRNA基因同源性较高(99.0%),而P1与其它3株(P2～P4)同源性较低,P1～P4间的kmt1基因、荚膜血清型A型的同源性较高(99.0%)。说明本次分的4株病原菌P1～P4均为荚膜血清型A型多杀性巴氏杆菌。 相似文献
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猪胸膜肺炎放线杆菌、多杀性巴氏杆菌和副猪嗜血杆菌复合PCR检测方法的建立 总被引：2，自引：0，他引：2
目的建立可以同时检测猪胸膜肺炎放线杆菌、多杀性巴氏杆菌和副猪嗜血杆菌的快速而可靠的PCR检测方法。方法和结果根据胸膜肺炎放线杆菌的Apx-VIA基因序列、多杀性巴氏杆菌和副猪嗜血杆菌的16SrRNA基因序列设计5条引物。猪胸膜肺炎放线杆菌、多杀性巴氏杆菌和副猪嗜血杆菌模板的PCR扩增产物大小分别为342bp,485bp和1258bp。复合PCR对1～12型猪胸膜肺炎放线杆菌标准株,6株多杀性巴氏杆菌标准株,1～15型副猪嗜血杆菌以及25株经生化鉴定确认为上述三种细菌的分离株的基因组DNA作为模板进行检测,均获得预期大小的扩增产物。以猪放线杆菌、吲哚放线杆菌等14种常见细菌作为阴性对照进行PCR检测,结果仅有支气管败血波氏杆菌产生了可以和上述三个特异性条带明显区分的PCR产物。复合PCR针对胸膜肺炎放线杆菌、多杀性巴氏杆菌和副猪嗜血杆菌的敏感性分别为14pg、34pg和37pg。结论本研究建立的复合PCR特异性好,敏感性高,可以用于猪胸膜肺炎放线杆菌、多杀性巴氏杆菌和副猪嗜血杆菌的快速检测。 相似文献
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对1例疑似鸭肝炎病毒和多杀性巴氏杆菌混合感染的10日龄肉鸭采用常规的病毒、细菌鉴定方法和RT-PCR、PCR方法分别进行病毒、细菌的分离与鉴定。病毒鉴定为新型鸭肝炎病毒,细菌鉴定为荚膜血清A型多杀性巴氏杆菌多杀亚种。细菌对SPF鸡的毒力试验结果显示,分离的巴氏杆菌与强毒标准株C48-1毒力相近,为强毒株。细菌对10日龄肉鸭的致病性回归试验结果表明,一定数量的该株巴氏杆菌可导致10日龄雏鸭的感染死亡。结果表明,该批肉鸭为新型鸭肝炎病毒和A型多杀性巴氏杆菌混合感染。这是国内首例从感染鸭肝炎病毒10日龄雏鸭肝脏中分离到多杀性巴氏杆菌。 相似文献
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Kumar AA Shivachandra SB Biswas A Singh VP Singh VP Srivastava SK 《Veterinary research communications》2004,28(8):657-667
Identification and estimation of the prevalence of Pasteurella multocida organisms in different animal and avian species in India during November 2000 to July 2003 was carried out. Out of 418 samples collected from different outbreaks suspected to be caused by P. multocida, a total of 206 bacterial cultures were identified as P. multocida on the basis of cultural, morphological and biochemical characteristics. All the 206 cultures were isolated from different domestic animal species (cattle, buffalo, sheep, goat, pig and rabbit), avian species (chicken, duck, quail, turkey, goose) and wild animals such as leopard and deer. Serotyping of P. multocida cultures revealed the presence of various serotypes (A:1, A:3, A:1,3, A:4, B:2, D:1 and -:1) among the livestock population. P. multocida polymerase chain reaction (PCR) assay applied on different forms of bacterial cultures (bacterial culture lysate, direct bacterial colony and mixed bacterial culture lysate) yielded an amplified product of approximately 460 bp specific for P. multocida. The results of PCR assay correlated well with conventional methods of identification. The present investigation revealed the presence of varied serotypes among livestock and PCR assay was found to be useful for rapid, sensitive and specific diagnosis of pasteurellosis in animals and avian species. 相似文献
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A serotype-specific polymerase chain reaction for identification of Pasteurella multocida serotype 1
A serotype-specific polymerase chain reaction (PCR) assay was developed for detection and identification of Pasteurella multocida serotype 1, the causative agent of avian cholera in wild waterfowl. Arbitrarily primed PCR was used to detect DNA fragments that distinguish serotype 1 from the other 15 serotypes of P. multocida (with the exception of serotype 14). Oligonucleotide primers were constructed from these sequences, and a PCR assay was optimized and evaluated. PCR reactions consistently resulted in amplification products with reference strains 1 and 14 and all other serotype 1 strains tested, with cell numbers as low as 2.3 cells/ml. No amplification products were produced with other P. multocida serotypes or any other bacterial species tested. To compare the sensitivity and further test the specificity of this PCR assay with traditional culturing and serotyping techniques, tissue samples from 84 Pekin ducks inoculated with field strains of P. multocida and 54 wild lesser snow geese collected during an avian cholera outbreak were provided by other investigators working on avian cholera. PCR was as sensitive (58/64) as routine isolation (52/64) in detecting and identifying P. multocida serotype 1 from the livers of inoculated Pekins that became sick or died from avian cholera. No product was amplified from tissues of 20 other Pekin ducks that received serotypes other than type 1 (serotype 3, 12 x 3, or 10) or 12 control birds. Of the 54 snow geese necropsied and tested for P. multocida, our PCR detected and identified the bacteria from 44 compared with 45 by direct isolation. The serotype-specific PCR we developed was much faster and less labor intensive than traditional culturing and serotyping procedures and could result in diagnosis of serotype 1 pasteurellosis within 24 hr of specimen submission. 相似文献
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2018年9月广西某羊场部分山羊发生流涕、咳嗽、呼吸困难和体温升高等临床症状的疾病,为确诊发病原因并提供治疗方案,采用病原分离培养、PCR扩增鉴定的方法进行诊断,并对分离菌进行生化鉴定、致病性试验和药敏试验。结果显示,病料在血平板有圆形的小菌落生长,革兰阴性小球短杆菌,而在PPLO培养基上不生长;病料的PCR扩增结果显示绵羊肺炎支原体和多杀性巴氏杆菌均为阳性;所分离到的病原菌经生化鉴定,该菌符合多杀性巴氏杆菌的特性;用多杀性巴氏杆菌种属和D型多杀性巴氏杆菌特异性引物扩增为阳性;致病性试验显示该菌对小鼠有很强的致病性;药敏试验显示该菌对头孢他啶、头孢噻肟、氧氟沙星高度敏感,对复方新诺明、强力霉素、红霉素、青霉素为耐药。结果表明该病是由绵羊肺炎支原体和D型多杀性巴氏杆菌混合感染引起。 相似文献
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Ewers C Lübke-Becker A Bethe A Kiebling S Filter M Wieler LH 《Veterinary microbiology》2006,114(3-4):304-317
To learn more about the molecular biology of Pasteurella multocida 289 strains isolated from various clinically healthy and diseased hosts were examined for capsule biosynthesis genes (capA, B, D, E, and F) and 14 virulence associated genes by PCR and DNA-DNA-hybridization. As expected, capsule type A strains were highly adapted to bovines (92.3%) and poultry (85.7%) while we mainly found capA (34.9%)- and capD (58.1%)-positive strains in swine. A noticeable amount of capD-positive strains also originated from small ruminants (34.9%) and capF was detected in wild type strains from diseased cattle (2.2%) and cats (7.4%). None of the isolates harboured capE, while capB was exclusively found in all strains from buffaloes. Nearly all isolates showed a combination of genes encoding outer membrane proteins, colonization factors, iron aquisition factors and superoxid-dismutases without any clue for host specificity. In contrast, the transferrin binding protein encoding gene tbpA (31.5%) was limited to ruminant strains and only 37.0% of all P. multocida strains harboured pfhA, coding for a filamentous hemagglutinin, supposed to be a putative adhesion- und serum resistance factor. PfhA revealed a strong positive association to the outcome of disease in bovine hosts and in combination with toxA to that in swine. The dermonecrotoxin encoding toxA, present in 12.5% of all strains, was detected in isolates from swine, small ruminants, cattle, and poultry. A significant association to the disease status, however, was only existent in swine, although with 66.7% we found a notably high prevalence of the toxin gene among strains from small ruminants. The genes toxA, tbpA and pfhA as well as capsule biosynthesis genes are supposed to be important epidemiological marker genes for characterizing P. multocida field strains. 相似文献
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中华鳖致病性嗜水气单胞菌的分离鉴定及药敏试验 总被引：3，自引：0，他引：3
对江西省进贤县某中华鳖养殖场送检的2只患病中华鳖进行细菌分离,且对分离的细菌进行培养特性观察、生化特性鉴定、毒力因子检测、毒力基因PCR检测、实验动物攻毒及体外药敏试验。结果表明,从2只中华鳖肝脏分离到3株菌,均为革兰阴性短杆菌,其中体型稍大中华鳖2株,体型稍小中华鳖1株;经过实验动物感染试验得出3株菌都为强毒力致病菌;通过生化鉴定、毒力因子及PCR检测确定为嗜水气单胞菌;体外药敏试验结果显示,3株菌对头孢曲松都高度敏感,对利福平、甲氧苄啶、氨苄青霉素都不敏感。 相似文献
18.
Jamaludin R Blackall PJ Hansen MF Humphrey S Styles M 《New Zealand veterinary journal》2005,53(3):203-207
AIMS: To examine pigs at slaughter in New Zealand for the presence of Pasteurella multocida, and to determine for isolates, their biochemical profiles, somatic and capsular types, and the presence or absence of the HSB and toxA genes, associated with haemorrhagic septicaemia (HS) and progressive atrophic rhinitis (PAR), respectively. METHODS: Swabs from 173 lungs, 158 palatine tonsils and 82 nasal passages of pigs at two abattoirs in New Zealand were cultured for P. multocida using conventional techniques, and isolated colonies were subjected to biochemical tests for identification of biovars. Somatic serotyping was conducted using an agar gel immunodiffusion (AGID) test. Polymerase chain reaction (PCR) assays were used to confirm phenotypic identification of colonies using species-specific primers, capsule type using serogroup-specific primers and multiplex PCR, and to test for the presence of HSB and toxA genes. RESULTS: Pasteurella multocida was isolated from 11/173 (6.4%) lung, 32/158 (20.2%) palatine tonsil and 5/82 (6.1 %) nasal swab samples, a total of 48 isolates from 413 samples (11.6%). Isolation rates per farm ranged from 1-53% of tissue samples collected from pigs 5-6 months of age. On phenotypic characterisation, isolates were allocated to seven main biovars, viz 1, 2, 3, 5, 9, 12, and a dulcitol-negative variant of Biovar 8, the majority (30/48) being Biovar 3. Of the 42 isolates for which somatic serotyping was conducted, 10% were Serovar 1, 79% were Serovar 3, 2% were Serovar 6,1, 2% were Serovar 12, and 7% could not be typed. All 48 isolates were confirmed as P. multocida using a species-specific PCR. In the capsular multiplex PCR, 92% of isolates were Capsular (Cap) type A, 2% were Cap D, and 6% could not be typed. None of the samples were positive for the HSB or toxA genes. CONCLUSION: Serovars or capsular types of P. multocida associated with HS or PAR in pigs were not detected. Establishment of species-specific, capsular and toxin PCR assays allowed the rapid screening of isolates of P. multocida, while serotyping provided an additional tool for epidemiological and tracing purposes. 相似文献
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为鉴定临床疑似鸭多杀性巴氏杆菌感染肉鸭的病原菌，本试验通过细菌分离培养、菌体形态观察、细菌生化鉴定、16S rRNA基因测序分析、细菌种特异性鉴定、荚膜分型鉴定和动物回归试验进行鉴定，并通过药敏试验和耐药基因检测进行耐药性分析。结果显示，从患病鸭肝脏组织分离到的细菌在鲜血琼脂培养基中呈现表面光滑凸起、灰白色菌落，为革兰氏阴性短小杆菌，瑞氏染色呈两极浓染；生化鉴定结果显示，分离菌能发酵葡萄糖、蔗糖和甘露醇，硫化氢、氧化酶和吲哚等试验阳性；16S rRNA基因序列系统进化树分析显示，该分离菌与多杀性巴氏杆菌聚为一支，同源性 > 99%；细菌种特异性鉴定结果与多杀性巴氏杆菌相符；荚膜分型鉴定结果仅扩增到约为1 050 bp的目的基因片段，与荚膜血清A型相符；动物回归试验显示，该分离菌有较强的致病性；药敏试验结果显示，该分离菌对羧苄西林、氨苄西林、复方新诺明和四环素等12种药物耐药；经耐药基因PCR检测显示，该分离菌携带Sul1、Sul3、tet（X）和Intl1 4种耐药基因，与药敏表型相符。本试验成功分离到1株鸭源荚膜血清A型多杀性巴氏杆菌，为鸭多杀性巴氏杆菌病的防治提供参考依据。 相似文献