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探明一起牛运输热的病原及生物学特性,本研究采集病死牛心血、肺脏,对其进行细菌分离、生化试验和PCR鉴定,并对分离株进行毒力基因检测、致病性研究。结果显示,该分离菌为革兰氏阴性菌,呈球状或短杆状、两端钝圆、两极浓染。生化试验结果显示,分离菌能发酵葡萄糖、麦芽糖、阿拉伯糖、甘露醇、甘露糖、乳糖、木糖等碳水化合物,不发酵脲酶和吲哚,产生少量酸而不产气,符合溶血性曼氏杆菌的生化特性。PCR鉴定为荚膜血清A1型溶血性曼氏杆菌,并完成了毒力基因的检测。结果表明,引起该批牛运输热的病原为携带毒力基因的荚膜血清A1型溶血性曼氏杆菌,本研究结果为进一步研究溶血性曼氏杆菌的致病机制、防控措施等提供参考。 相似文献
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肉牛溶血性曼氏杆菌的分离鉴定及耐药性分析 总被引：1，自引：0，他引：1
为探究四川省某肉牛养殖场从外地引种的西门塔尔牛出现体温升高、咳嗽和呼吸困难等症状的病原,本实验采集24份病牛鼻腔棉拭子,随机挑取10份进行细菌的培养、分离鉴定以及分离菌株的耐药性分析;同时采用特异性检测溶血性曼氏杆菌的PCR方法对全部病牛鼻腔棉拭子进行检测。结果显示,从10份病牛鼻腔棉拭子中分离鉴定出10株溶血性曼氏杆菌,分型PCR方法结果显示其中8株为荚膜血清6型,其余2株未定型;药敏试验结果显示,溶血性曼氏杆菌分离株对大多数氟喹诺酮类、氨基糖苷类、四环素类药物敏感,对部分β-内酰胺类和酰胺醇类药物耐药;特异性检测溶血性曼氏杆菌的PCR方法从24份鼻腔棉拭子中检测出23份阳性样品,表明该群病牛溶血性曼氏杆菌的感染率很高。本研究为该牛场的呼吸道病的防控提供了参考。 相似文献
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2017年3月份,黑龙江省五常市某规模化奶牛场发生犊牛急性肺炎,为了确诊其病因,无菌采取7份呼吸道症状犊牛鼻拭子进行细菌分离鉴定,同时进行生化试验、PCR鉴定和药敏试验。结果表明:共分离得到3株细菌,符合大肠杆菌、巴氏杆菌、溶血性曼氏杆菌生化特性;PCR引物能有效扩增巴氏杆菌OmpH基因、溶血性曼氏杆菌lkt A基因和大肠杆菌Sta基因;分离的大肠杆菌对恩诺沙星、环丙沙星、阿米卡星中敏,巴氏杆菌对恩诺沙星、阿莫西林、青霉素高敏,溶血性曼氏杆菌对阿米卡星、头孢唑林、青霉素高敏;经检查7份鼻拭子中大肠杆菌感染1份,溶血性曼氏杆菌感染1份,巴氏杆菌感染5份。说明该牛场细菌污染严重,应引起重视。 相似文献
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《中国兽医杂志》2019,(7)
为了研究感染羊引起肺炎的溶血性曼氏杆菌的分子特征,分别从2只山羊肺部分离细菌,在血琼脂平板上分离纯化后,经培养、革兰染色镜检、生化试验、16S rDNA序列鉴定,结合临床症状鉴定这2株细菌为溶血性曼氏杆菌,分别命名为NH1、NH2。采用PCR方法,对2株溶血性曼氏杆菌进行血清型1型、2型和6型的鉴定,结果2株细菌均为血清型2型。采用多位点序列分型法对2株溶血性曼氏杆菌的7个管家基因扩增并测序,结果等位基因adk、aroE、deoD、gapDH、gnd、mdh和zwf的序号分别为1、1、3、1、1、1和4, 2株分离菌序列型一致,均是ST46。通过纸片扩散试验检测细菌对抗菌药物的敏感性,MH1对链霉素耐药,对多西环素和妥布霉素中介,对其他13种药物均敏感;MH2对链霉素中介,对其他15种药物均敏感。 相似文献
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为探究西藏自治区山南市某地农户饲养的绵羊大批死亡的原因,采集病死羊心脏、脾脏、小肠、肺脏、气管等病料,进行细菌培养、分离鉴定、PCR检测、血清型鉴定、毒力基因检测及药敏特性分析。结果显示:从病死羊肺脏病料中分离出一株溶血性曼氏杆菌,血清型为2型;特异性PCR检测为阳性,证明分离菌株为溶血性曼氏杆菌;药敏试验结果显示,分离的溶血性曼氏杆菌对大多数临床常用抗生素敏感;主要毒力基因lktA检测为阳性。该研究首次从西藏绵羊分离出溶血性曼氏杆菌,并研究了其药敏特性,为该病的诊断与治疗提供了参考。 相似文献
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李雪霞李富祥赵文华等 《上海畜牧兽医通讯》2014,(1):36-38
采用PCR鉴定、16S rDNA基因鉴定方法,对从云南某羊场病羊肺脏中分离到的1株革兰氏阴性小球杆菌进行系统鉴定,并对分离株的致病性和药物敏感性进行研究。鉴定结果表明:分离株溶血性曼氏杆菌PCR鉴定为阳性;分离株16S rDNA基因序列与GenBank上公布的其它溶血性曼氏杆菌同源性为96%~99%,与溶血性曼氏杆菌D171参考株同源性高达99%,因此将分离株系统鉴定为溶血性曼氏杆菌。致病性实验表明:分离株对小白鼠有致病性,该分离株对头孢呋辛、头孢曲松等头孢类抗生素和四环素最为敏感。本研究为我国南方省份曼氏杆菌病的防控和深入研究奠定了基础。 相似文献
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《黑龙江畜牧兽医》2020,(5)
为了分离新型曼氏杆菌并研究其生物学特性,试验对从两例山羊病例中分离出的相似细菌进行纯化培养,通过革兰氏染色镜检、生化试验、16S rDNA基因序列测定、多位点序列分型法(MLST)鉴定、血清型鉴定、药敏试验等方法研究其生物学特性。结果表明:分离得到2株革兰氏阴性菌,2株细菌的生化试验和16S rDNA基因序列分析鉴定符合溶血性曼氏杆菌的特点,将其分别命名为201705YF和201805YS;对2株细菌进行血清型1型、2型和6型的多重PCR鉴定,201705YF为血清型2型,而201805YS的1型、2型和6型血清型检测为阴性;对2株细菌的7个管家基因adk、aroE、deoD、gapDH、gnd、mdh和zwf进行扩增并测序,菌株201705YF对应的7个管家基因的序列号为50,20,15,19,15,17,19,菌株201805YS对应的7个管家基因的序列号为1,2,20,2,1,1,1,这2株细菌的基因型为新基因型,即ST50和ST51;2株细菌对左氧氟沙星、卡那霉素、多黏菌素B、氟苯尼考、诺氟沙星、多西环素、美洛西林、环丙沙星、头孢哌酮等抗生素敏感,但201705YF对丁胺卡那耐药,201805YS对庆大霉素、新霉素、妥布霉素耐药。说明从送检病死山羊中分离出的2株细菌为不同血清型和新ST型的溶血性曼氏杆菌,为溶血性曼氏杆菌进化和流行病学关系研究提供了新的相关研究数据。 相似文献
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株羊源溶血性曼氏杆菌的分离鉴定药敏试验及致病性研究 《畜牧与饲料科学》2022,43(5):123-128
[目的] 对某养殖场由呼吸道症状引发的山羊死亡病例进行病原学诊断,并对分离到的病原进行药敏试验及致病性分析。[方法] 无菌条件下剖检并采集死亡羊只肺脏及气管组织,接种于TSA固体培养基,37 ℃培养22~24 h;挑取疑似菌落,纯化后进行革兰染色镜检和生化鉴定;对经表型鉴定的分离菌株进行16S rDNA PCR扩增、测序,并进行遗传进化树构建和同源性分析;采用微量肉汤稀释法对分离菌株进行药敏试验;利用动物攻毒试验确定分离菌株对羔羊的致病性。[结果] 从临床样本中分离到1株细菌,命名为DMQ-Y-Mh。纯化后的分离菌株镜检为革兰阴性短杆菌,经生化鉴定以及16S rDNA PCR扩增、测序、同源性分析,将分离菌株鉴定为溶血性曼氏杆菌（Mannheimia haemolytica）。分离菌株对环丙沙星、阿奇霉素、庆大霉素敏感,对左氧氟沙星、土霉素、氟苯尼考中度敏感,对替米考星、恩诺沙星、泰乐菌素耐药。攻毒羔羊于72 h内死亡,剖检眼观气管及肺脏支气管内有黏性分泌物;肺脏组织有深红色病灶,与正常肺脏组织界限明显,可再次从死亡羔羊肺脏及气管组织分离到溶血性曼氏杆菌。[结论] 溶血性曼氏杆菌是造成该养殖场发生羊只死亡的病原菌,药敏试验结果为指导临床用药提供了参考。 相似文献
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Alexander TW Cook SR Yanke LJ Booker CW Morley PS Read RR Gow SP McAllister TA 《Veterinary microbiology》2008,130(1-2):165-175
The objective of this study was to design a multiplex PCR assay to identify Mannheimia haemolytica, Mannheimia glucosida and Mannheimia ruminalis. The multiplex PCR included primer sets HP, amplifying a DNA region from an unknown hypothetical protein, Lkt and Lkt2, amplifying different regions of the leukotoxinD gene, and 16S to amplify universal bacterial sequences of the 16S rRNA gene. Based on positive amplification, isolates were delineated as M. haemolytica (HP, Lkt, 16S), M. glucosida (HP, Lkt, Lkt2, 16S), or M. ruminalis (HP, 16S). The validity of the assay was examined against 22 reference strains within the family Pasteurellaceae and 17 field isolates (nasal) that had been collected previously from feedlot cattle and tentatively identified as M. haemolytica based on morphology and substrate utilization. Additionally, 200 feedlot cattle were screened for M. haemolytica using multiplex PCR. Forty-four isolates from 25 animals were identified as M. haemolytica. The PCR assay positively identified all M. haemolytica, as confirmed by phenotypic tests and clustering based upon cellular fatty acid methyl ester (FAME) profiles. Selected nasal isolates that exhibited evidence of haemolysis, but were M. haemolytica-negative based on PCR, were also confirmed negative by phenotypic and FAME analyses. The multiplex PCR assay required no additional phenotypic tests for confirmation of M. haemolytica, within the group of bacteria tested. 相似文献
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Berge AC Sischo WM Craigmill AL 《Journal of the American Veterinary Medical Association》2006,229(8):1279-1281
OBJECTIVE: To determine the antimicrobial susceptibility of common respiratory tract pathogens from sheep and goats. DESIGN: Cross-sectional study. SAMPLE POPULATION: 41 respiratory tract isolates from sheep and 36 isolates from goats. PROCEDURES: Disk diffusion assay was used to determine antimicrobial susceptibility of isolates to amoxicillin-clavulanic acid, ceftiofur, ciprofloxacin, florfenicol, and tetracycline. Minimum inhibitory concentrations of florfenicol for these isolates were determined by use of the microbroth dilution technique. RESULTS: The most common isolates were Pasteurella multocida (n = 28) and Mannheimia haemolytica (39). All isolates were susceptible to amoxicillin-clavulanic acid, ceftiofur, ciprofloxacin, and florfenicol. Five percent (4/77) of isolates were resistant to tetracycline. CONCLUSIONS AND CLINICAL RELEVANCE: Susceptibility of respiratory tract pathogens isolated from sheep and goats to commonly used antimicrobial drugs in this study was high. Treatment of these species for bacterial respiratory tract disease is likely not complicated by antimicrobial resistance. 相似文献
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为了解广西地区牛呼吸道疾病综合征（bovine respiratory disease complex，BRDC）的病原情况，本研究通过RT-PCR/PCR方法和细菌分离鉴定方法对2016-2017年送检的117份患有呼吸道疾病的病料进行病原诊断，并对主要分离菌进行药物敏感性试验。结果显示，RT-PCR/PCR方法检测的肺炎克雷伯氏菌、牛支原体、化脓隐秘杆菌、多杀性巴氏杆菌、牛传染性鼻气管炎病毒（IBRV）、溶血性曼氏杆菌的检出率分别为41.0%（48/117）、28.2%（33/117）、20.5%（24/117）、15.4%（18/117）、12.8%（15/117）、5.1%（6/117），而细菌分离鉴定方法检测的肺炎克雷伯氏菌、大肠杆菌、牛支原体、化脓隐秘杆菌、多杀性巴氏杆菌、溶血性曼氏杆菌的检出率分别为41.0%（48/117）、33.3%（39/117）、17.1%（20/117）、7.7%（9/117）、2.6%（3/117）、2.6%（3/117），牛副流感病毒3型、牛呼吸道合胞体病毒和牛病毒性腹泻病毒未检出，且PCR方法更敏感。药敏试验结果显示，20株牛支原体对β-内酰胺类、磺胺类、多肽类药物的耐药率为90.0%~100.0%，对喹诺酮类、庆大霉素、阿米卡星和卡那霉素敏感（耐药率为在10.0%~25.0%）；30株大肠杆菌和30株肺炎克雷伯氏菌除了对头孢噻肟、头孢曲松和头孢他啶敏感外（耐药率分别为13.3%~20.0%、10.0%~30.0%），对其他15种药物均具有耐药性（耐药率分别为50.0%~100.0%、40.0%~100.0%）。综上所述，广西地区牛呼吸道疾病主要以牛支原体、大肠杆菌和肺炎克雷伯氏菌引发的混合感染为主，且分离菌均已出现不同程度的耐药性。 相似文献
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OBJECTIVE: To perform a comprehensive phenotypic characterisation of 35 isolates of bacteria previously identified as haemolytic Pasteurella-Actinobacillus and obtained from cattle and sheep. DESIGN: The 35 isolates that had been obtained from Australian animals, 30 from cattle and five from sheep, were compared with reference strains of the five recognised species of the genus Mannheimia--M. haemolytica, M. glucosida, M. granulomatis, M. ruminalis and M. varigena. RESULTS: Thirty-four of the isolates could be confidently assigned to three species of the genus Mannheimia. Twenty-nine were M. haemolytica, with 25 being isolated from cattle and four from sheep. All but three of the bovine M. haemolytica were isolated from pneumonic lungs. Of the three remaining bovine M. haemolytica isolates, one was obtained in pure culture from a bovine milk sample and the other two as part of a mixed flora associated with a middle ear infection of a calf suffering mucosal disease. Of the four ovine M. haemolytica isolates, two were isolated in pure culture from milk and two, also in pure culture, from pneumonic lungs. Three bovine isolates were identified as M. granulomatis--one from a tongue abscess, one from a jaw abscess and one from a lung showing suppurative bronchopneumonia. Two bovine isolates were identified as M. varigena--one coming from an udder and the other from a spleen. The available diagnostic records provided no information on whether these isolates were associated with a disease process. The remaining isolate was obtained from an ovine tongue abscess and could not be assigned to a recognised species within the genus Mannheimia. CONCLUSION: The study represents the first time that M. haemolytica, M. granulomatis and M. varigena have been recognised as being present in cattle and sheep in Australia. Veterinary laboratories that encounter Pasteurella-Actinobacillus-like organisms from cattle and sheep should attempt as complete a characterisation as possible to help improve our knowledge of the disease potential of these organsims. 相似文献
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为探明一起肉牛运输热的病原及生物学特性,本研究无菌采集病死牛心血、肺脏、肝脏和脾脏,对其进行细菌分离、生化试验和PCR鉴定,并对分离株进行毒力基因检测、致病性研究。结果显示,7株分离菌均为革兰氏阴性短杆菌,具有微弱的β-溶血,瑞氏染色可见两极浓染及明显的荚膜。生化试验结果显示,分离菌能发酵葡萄糖、麦芽糖、阿拉伯糖、甘露醇、甘露糖、木糖等碳水化合物,不发酵脲酶、MR-VP和吲哚,产生少量酸而不产气,结果符合溶血曼氏杆菌生化特性。PCR鉴定均为荚膜血清A2型,分离菌均含有四型菌毛相关基因ptfA、参与复制相关基因dnaN、白细胞介素相关基因LktC3种毒力基因。分离菌对小鼠的LD50值在107.83～108.50 CFU/mL之间,不同菌株间小鼠LD50值存在一定差异,但差异不明显。结果表明,引起该批肉牛运输热的病原为携带毒力基因的荚膜血清A2型溶血曼氏杆菌,本研究结果为进一步研究溶血曼氏杆菌的致病机制提供参考。 相似文献
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Trehalose-negative strains of the Pasteurella haemolytica complex have recently been transferred to a new genus, Mannheimia. This genus presently consists of five named species: M. haemolytica, M. glucosida, M. granulomatis, M. ruminalis and M. varigena. The purpose of this study was to investigate the occurrence of these species and lesions associated with these isolates in Denmark. In all 106 M. haemolytica-like strains isolated from pathological material from cattle, sheep, pigs and hares submitted to the Danish Veterinary Laboratory between 1994 and 1998 were investigated. Phenotypic characterization and ribotyping were used for identification in addition to sequencing of the 16S rRNA genes for selected strains. The species allocation was determined by comparison to results from a previous polyphasic taxonomic study. Seventy-one percent of the strains belonged to M. haemolytica, 18% to M. varigena and 8% to unnamed groups within the genus Mannheimia. Single isolates identified as M. glucosida and P. trehalosi, respectively, were detected. Two isolates belonged to M. granulomatis. Forty-three percent of the strains belonged to serotype 1, 41% were untypeable, while the rest belonged to serotypes 2, 7, 9, and 16. The present investigation also showed that a simplified phenotypic characterization using Diatabs Diagnostic Tablets (Rosco, Denmark) represents a useful method for obtaining a quick and reliable species identification. Finally, the investigation confirmed that serotyping does not represent a reliable method for species identification. The heterogeneity of species associated with bovine "pasteurellosis" should be considered in future studies to improve our understanding of the pathogenesis of pneumonic disease. 相似文献
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A retrospective study of Pasteurellaceae isolated from domestic sheep (Ovis aries) was conducted. The aim was to identify Pasteurellaceae present in animals that were clinically healthy and others with evidence of respiratory disease. The bacteria had been isolated from samples submitted to the University of Idaho Caine Veterinary Teaching Center as part of disease diagnostic testing. The 844 isolates identified mainly three species of Pasteurellaceae: Mannheimia haemolytica, Pasteurella multocida, and Pasteurella (Bibersteinia) trehalosi. A total of 114 biovariants were identified among these three species. Individual biovariants were identified 1-180 times. Two of those (M. haemolytica 1 and P. (B.) trehalosi 2) constituted 36% of the isolates, and were the only biovariants sufficiently numerous to account for >7% of the total isolates. Samples were primarily submitted from sheep with signs of respiratory disease. Eighty percent of biovariants were identified most often in animals with signs of respiratory disease, but 26% of biovariants were isolated from both sheep with respiratory disease and apparently healthy sheep. P. multocida constituted 4.7% of isolates, and were exclusively associated with animals with respiratory disease. The ability of isolates to produce beta-hemolysis on culture media was not associated with animals with respiratory disease (odds ratio 0.77, 95% CI 0.50-1.19). The inference of this study is limited due to the retrospective study design. However, it is the first study that provides an extensive baseline list of biovariants associated with respiratory disease in domestic sheep. 相似文献
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Effects of sub-minimum inhibitory concentration antibiotic levels and temperature on growth kinetics and outer membrane protein expression in Mannheimia haemolytica and Haemophilus somnus 
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下载免费PDF全文 Brenda Y. Reeks Franklin R. Champlin Daniel B. Paulsen Daniel W. Scruggs Mark L. Lawrence 《Canadian journal of veterinary research》2005,69(1):1-10
The objective of this study was to determine the effects of sub-minimum inhibitory concentrations (sub-MICs) of 2 veterinary antibiotic preparations, chlortetracycline (CTC) and chlortetracycline-sulfamethazine (CTC + SMZ), on growth kinetics and outer membrane protein expression in Mannheimia haemolytica and Haemophilus somnus at normal and febrile body temperatures. Sub-minimum inhibitory concentrations of both antibiotics reduced the growth rates of M. haemolytica and H. somnus. Growth of both species was not inhibited when grown at 41 degrees C compared to 37 degrees C. There was no detectable consistent effect of antibiotic or temperature on outer membrane protein expression for either species. Our study indicates that sub-MIC levels of CTC and CTC + SMZ markedly impair growth of clinical M. haemolytica and H. somnus isolates, potentially allowing more effective host clearance during infection. 相似文献