绵羊肺炎支原体、丝状支原体山羊亚种和精氨酸支原体多重PCR检测方法的建立及应用

根据GenBank登陆的绵羊肺炎支原体(MO)、丝状支原体山羊亚种(MmC)和精氨酸支原体(M.arg)的相关基因序列,分别设计了扩增MO hsp70基因、MmC hsp70基因和M.arg ADI基因片段的特异性引物,通过对反应条件和反应体系的优化,建立了MO、MmC和M.arg的多重PCR检测方法。特异性试验结果显示:该方法能同时扩增出MO 703bp、MmC 385bp和M.arg223bp的特异性目的片段,而对其他病原的DNA扩增为阴性。敏感性试验结果显示:该方法对这3种支原体的最低核酸检出量均为10pg。55份临床样品检测结果表明:三重PCR检测结果与分离培养诊断方法一致,均能检测出样品中的病原菌。本试验建立的多重PCR方法能为MO、MmC和M.arg的感染提供正确快速诊断方法。     

应用双重PCR方法检测羊支原体肺炎病原

通过对丝状支原体山羊亚种(M.mycoides subsp.capri,Mmc)特异性引物MmcF/MmcR和绵羊肺炎支原体(M.ovipneumontiae,Mo)特异性引物LmF/LmR退火温度、引物浓度比例等条件的选择,建立了一个可以同时检测Mmc和Mo的双重PCR方法。该方法可同时扩增出Mmc 195 bp和Mo 361 bp目的片段,但对其他病原菌不能扩增出任何条带,具有良好的特异性。敏感性试验表明,该方法能够分别检测出0.1ng的Mmc DNA和0.01 ng的Mo DNA,或同时检测出1ng Mmc和1ng Mo混合的DNA。用该双重PCR方法可对实验室保存的4株绵羊肺炎支原体和2株丝状支原体山羊亚种进行准确鉴定,并可从临床病料中检测出相应支原体,表明建立的双重PCR方法可用于Mmc和Mo的快速鉴定、实验室诊断和病原学调查。     

鸡毒支原体与鸡滑液囊支原体双重PCR检测方法的建立

为建立能同时检测鸡毒支原体(Mycoplasma gallisepticum, MG)和鸡滑液囊支原体(Mycoplasma synoviae,MS)的双重PCR诊断方法,该研究根据GenBank中登录的MG gapA基因序列和MS heat shock ATP-dependent protease基因序列,设计2对特异性引物,通过对PCR扩增条件的优化,建立了能够同时检测MG和MS的双重PCR诊断方法。特异性检测结果显示,该方法能够扩增出729 bp的MG和309 bp的MS特异性片段,对禽巴氏杆菌、大肠杆菌、鸡白痢沙门菌、副鸡禽杆菌核酸扩增均为阴性;敏感性检测结果显示,对MG和MS DNA的最低检出量均为5×10^-2 ng/μL;临床样品的检测结果显示,所建立的双重PCR方法可同时有效地检测出MG、MS混合感染和单独感染。该研究建立的鸡毒支原体与鸡滑液囊支原体双重PCR方法具有良好的特异性、敏感性、重复性,为快速、高效检测MG和MS提供了技术支持。     

丝状支原体簇及绵羊肺炎支原体双重PCR方法的建立及应用

为了快速检测和鉴别丝状支原体和绵羊肺炎支原体,试验采用2对检测丝状支原体和绵羊肺炎支原体的特异性引物,成功建立了一种能同时检测丝状支原体和绵羊肺炎支原体的双重PCR方法.结果表明:该方法特异性强、敏感性高,对临床病料的检测效果好.     

绵羊肺炎支原体恒温热隔绝式PCR方法的建立

为建立绵羊肺炎支原体(Mo)感染疾病的现场便捷化诊断方法,本研究选择Mo高度保守区域tuf基因设计合成一对特异性引物和探针,建立了恒温热隔绝式PCR(iiPCR)方法并对其特异性、灵敏性进行评价。结果显示,建立的iiPCR方法仅对Mo的典型菌株和其临床分离菌株的DNA呈阳性结果,具有较强的特异性;对Mo基因组DNA的检出下限为24fg/μL,具有较高的敏感性。利用该方法检测临床样品,结果显示该方法可以从临床采集的羊鼻拭子及支气管拭子中检测出MoDNA,对扩增产物的测序表明检测结果具有较高的准确性。本研究建立的iiPCR方法为Mo的检测及其感染疾病的诊断提供了快速、便捷的技术手段。     

牛支原体双重PCR检测方法的建立

为鉴别牛支原体(Mycoplasma bovis)与丝状支原体丝状亚种SC(M.mycoides subsp.mycoides SC),本实验通过优化M.bovis特异性引物pMB81-1/pMB81-2s和MmmSC特异性引物SC1/SC2的退火温度,建立了鉴别M.bovis和MmmSC的双重PCR检测方法。该方法能够分别由M.bovis和MmmSC扩增得到528bp和270bp片段。敏感性试验结果显示该方法检测M.bovis和MmmSC培养物的最低浓度分别为106cfu/mL和105cfu/mL。特异性试验结果显示,该方法对无乳支原体代表株PG2、丝状支原体丝状亚种LC型代表株Y-goat、山羊支原体山羊肺炎亚种Mccp、绵羊支原体Y-98、猪鼻支原体BST-7、巴氏杆菌以及结核分枝杆菌扩增结果均为阴性。应用该方法对临床病料的检测结果与培养鉴定结果的符合率为100%,表明该方法具有良好的特异性和敏感性,可以应用于临床检测。     

广西山羊传染性胸膜肺炎病原的二重PCR快速诊断方法的建立

根据绵羊肺炎支原体标准株Y98和丝状支原体山羊亚种标准株PG3的16S rRNA两端的保守区序列设计了2对引物,建立了广西山羊传染性胸膜肺炎病原的二重PCR快速检测方法.试验结果显示,所建立的二重PCR能特异地扩增绵羊肺炎支原体和丝状支原体山羊亚种的基因片段,其敏感性可达lPg,,用建立的二重PCR检测了20份临床病例肺组织,检出率为70%(14/20),其中6份扩增出丝状支原体山羊亚种的基因片段,10份扩增出绵羊肺炎支原体的基因片段,有2份同时扩增出两种支原体的基因片段.培养法检出率为40%(8/20),而这8份病料均为PCR阳性.     

绵羊肺炎支原体和溶血性曼氏杆菌双重PCR检测方法的建立及应用

为建立同时检测绵羊肺炎支原体(MO)和溶血性曼氏杆菌(Mh)的方法,本研究根据MO的hsp70基因和Mh的gcp基因分别设计引物,建立了同时检测这两种病原的双重PCR检测方法.实验结果显示该方法能够特异性的扩增MO (135 bp)和Mh (227 bp) DNA片段,其最低检出量分别为2.06×103拷贝/μL和6.37 c fu/mL,与单一PCR相同.该方法对常见的致病菌无交叉反应.对临床样本的检测结果显示MO和Mh的检出率分别为56.25％和52.50％,与单独PCR符合率为100％.研究结果表明,本研究所建立的双重PCR检测方法具有特异性强、敏感性高等特点,为临床上MO和Mh混合感染的快速检测、鉴定以及流行病学调查提供了方便、快捷、准确的方法.     

山羊中绵羊肺炎支原体的分离及鉴定

从四川省乐至县发生胸膜肺炎性传染病的山羊群中采集12个鼻拭子及4个肺组织病料,进行病原分离培养和特异性PCR检测。结果从9个鼻拭子和4个肺组织中分离到支原体,经鉴定均为绵羊肺炎支原体,未发现丝状支原体簇成员及多杀性巴氏杆菌和溶血性曼氏杆菌。结果表明,绵羊肺炎支原体是引起该山羊群发生胸膜肺炎的病原,同时说明绵羊肺炎支原体也是山羊支原体性肺炎的重要病原之一。     

猪肺炎支原体和猪鼻支原体双重荧光定量PCR检测方法的建立

建立同时检测猪肺炎支原体和猪鼻支原体的双重荧光定量PCR方法。根据猪肺炎支原体P97序列和猪鼻支原体P37序列的特异性引物,分别标记FAM和Texas Red荧光报告基团的2条TaqMan探针,建立和优化双重实时荧光定量PCR反应条件和体系,同时检测其敏感性、特异性和重复性。建立的双重荧光定量PCR对猪肺炎支原体和猪鼻支原体的最低检测值均为10copies·μL-1;与猪源致病菌、病毒和其他常见细菌均无交叉反应;各浓度标准品的Ct值变异系数小于5%,重复性好。检测72份临床样本,其中猪肺炎支原体的肺阳性率为80%,鼻拭子阳性率22%,支气管肺泡灌洗液阳性率58.33%;猪鼻支原体的肺阳性率为40%,鼻拭子阳性率66%,支气管肺泡灌洗液阳性率41.67%。建立的双重荧光定量PCR方法比普通PCR更加敏感,实用性强,可用于临床样品的检测。该方法能同时快速和定量地检测猪肺炎支原体和猪鼻支原体,在短时间内获得样品的多个信息,快速地解决了多次检测所需的时间以及经济消耗,为猪肺炎支原体和猪鼻支原体的监测和防控提供了新型、可靠的检测技术。     

Development and Application of a Duplex PCR Assay for Detecting Mycoplasma ovipneumiae and Mycoplasma arginini

In order to establish a duplex PCR method for simultaneous detection of Mycoplasma ovipneumiae and Mycoplasma arginini, specific primers of Mycoplasma ovipneumiae and Mycoplasma arginini were designed, and evaluated its sensitivity and specificity after optimizing the reaction conditions of PCR.Then, a total of 40 nasal swabs were tested by duplex PCR.The assay could specifically amplify PCR fragments of 545 and 806 bp from Mycoplasma ovipneumiae and Mycoplasma arginini, respectively.While no PCR products were detected for other pathogens.The detection limits of the assay were determined to be 100 pg/μL for Mycoplasma ovipneumiae and 10 pg/μL for Mycoplasma arginini.The duplex PCR could detect Mycoplasma ovipneumiae and Mycoplasma arginini, and the coincidence rate could reach as high as 92.5% with enrichment culture about the 40 nasal swabs.The results suggested that the duplex PCR could be useful for clinical detection of Mycoplasma ovipneumiae and Mycoplasma arginini.     

丝状支原体簇和多杀性巴氏杆菌双重PCR方法的建立及应用

本研究旨在建立丝状支原体簇和多杀性巴氏杆菌的双重PCR检测方法,从而为临床上同时检测这2类病原的感染提供一种更方便、快捷、准确的工具。本研究采用2对特异性检测丝状支原体簇和多杀性巴氏杆菌的引物,对PCR反应体系和反应条件进行了优化,并对双重PCR的特异性及敏感性进行了评价,随后采用该方法对52份临床样本进行了检测。结果显示,所建立的双重PCR方法能同时扩增丝状支原体簇成员和多杀性巴氏杆菌的DNA,而对来源于其他常见病原的DNA均无扩增;对丝状支原体簇和多杀性巴氏杆菌的最低检测限分别为24.8和28.9 pg;能成功地从临床样本中检测丝状支原体簇成员和多杀性巴氏杆菌。结果表明,本研究所建立的双重PCR方法具有很好的特异性和敏感性,为临床丝状支原体簇和多杀性巴氏杆菌感染的快速诊断、病原鉴定及流行病学调查提供了有效的方法。     

用PCR和探针杂交法检测鸡败血霉形体

根据鸡败血霉形体ｆＭＧ－２核酸片断序列,设计合成了１对２５ｂｐ寡核苷酸引物,对鸡败血霉形体基因组ＤＮＡ进行扩增,均获得预期的７３２ｂｐ扩增产物,检测灵敏度为１ｂｐ;参考菌株ＤＮＡ无扩增。回收纯化琼脂糖电泳凝胶中的扩增产物,ＤＩＧ随机引物法合成核酸探讨,Ｄｏｔ－ｂｌｏｔ杂交试验,鸡败血霉形体呈阳性,检测灵敏度为１００ｐｇ;其他为阴性。对自然发病鸡群检测进一步表明,建立的ＰＣＲ和探针杂交法具有高度的灵     

Species-specific polymerase chain reactions for the detection of Mycoplasma buteonis, Mycoplasma falconis, Mycoplasma gypis, and Mycoplasma corogypsi in captive birds of prey

Mycoplasmas are pathogens of different avian species, but the role of Mycoplasma in raptors is not yet completely determined. As Mycoplasma isolation and identification present several difficulties, species-specific polymerase chain reactions (PCRs) for the detection of mycoplasmas found in birds of prey (Mycoplasma buteonis, Mycoplasma corogypsi, Mycoplasma falconis, and Mycoplasma gypis) were established. The specificity of the PCR methods were investigated using known avian Mycoplasma reference strains and isolates as well as related bacteria and was found to be specific. Amplificons obtained with these PCRs from field samples showed no false-positive results in restriction enzyme analysis and sequencing. The sensitivities of the different PCR assays varied between 50 fg and 1 pg DNA. Twenty-five tracheal swabs from healthy captive birds of prey were investigated by culture and immunobinding assay as comparison to the PCRs. Mycoplasmal DNA was detected in 88% of the samples, with negative results only from vultures. Mycoplasma falconis and M. buteonis were regularly found in falcons, and M. gypis was found in a common buzzard. Mycoplasma corogypsi was not demonstrated. Several isolates could not be differentiated using an immunobinding assay as well as the described PCR methods.     

A comparison of routine culture with polymerase chain reaction technology for the detection of Mycoplasma species in feline nasal samples.

Nasal flush samples were collected from 20 cats and submitted for Mycoplasma culture and polymerase chain reaction (PCR). Nasal biopsy samples were also obtained from each cat and simultaneously evaluated for Mycoplasma by standard culture and PCR. Concordance of the test results was determined through calculation of the kappa statistic. In 6 cats, nasal flush samples were culture positive for Mycoplasma. PCR was positive in each culture-positive cat and also positive in 1 flush sample that was culture negative. DNA sequencing of the PCR product from the culture negative flush sample identified the organism as Mycoplasma arginini. All other flush samples that were culture negative were also PCR negative (kappa = 0.89). Nasal biopsy samples from 7 cats were culture positive for Mycoplasma, and all were PCR positive. Biopsy samples that were culture negative for Mycoplasma were also PCR negative (kappa = 1.0). Results of culture and PCR for both nasal flush and biopsy were concordant in 19 of 20 cats, and PCR was able to identify an unusual Mycoplasma species that did not grow in culture. In most cats, organisms could be detected in either nasal flush or biopsy samples. In this study, PCR provided rapid and sensitive detection of Mycoplasma species in nasal samples from cats and detected 1 organism that did not grow in culture.     

山羊支原体性肺炎流行病学调查

山羊支原体性肺炎是威胁山羊养殖的重要传染病,为了解其流行情况,对四川省主要山羊养殖地区的山羊支原体性肺炎进行了流行病学调查。从四川省7个地区山羊养殖场采集肺脏和鼻腔棉拭子样本共135份,经过分离鉴定得到42株支原体,其中绵羊肺炎支原体36株,丝状支原体6株;其中6个羊场仅分离到绵羊肺炎支原体,1个羊场同时分离到绵羊肺炎支原体和丝状支原体。本试验结果表明,绵羊肺炎支原体是引起四川省山羊支原体性肺炎的主要病原,个别地方存在绵羊肺炎支原体和丝状支原体混合感染。     

Application of a nested polymerase chain reaction assay to detect Mycoplasma hyopneumoniae from nasal swabs.

The porcine respiratory disease complex (PRDC) is an increasingly important cause of decreased swine productivity and is characterized by slow growth, decreased feed efficiency, anorexia, cough, and dyspnea. Mycoplasma hyopneumoniae is among the most prevalent and important infectious agents associated with PRDC. Understanding of mycoplasmal pneumonia has been hindered by inadequate diagnostic methods. Many of the currently available tests are relatively insensitive or nonspecific when used in a diagnostic laboratory setting or are too costly or difficult for routine diagnostic use. Several polymerase chain reaction (PCR) assays have been described, but they are not sensitive enough to detect the microorganisms in live pigs, from either nasal or tracheal swabs. A nested PCR using 2 species-specific sets of primers from the 16S ribosomal DNA gave positive results with as little as 80 microorganisms and did not cross-react with other mycoplasma species or with other microorganisms commonly found in the respiratory tract of pigs. This assay was better suited for detection of M. hyopneumoniae from nasal swabs than was conventional PCR. Nasal swab samples were taken at different time periods following experimental challenge of 10 susceptible pigs. Only 2 of the 55 swabs examined gave a positive result with conventional PCR, whereas 30 of the 55 swabs gave a positive result using the nested PCR. Twenty of 40 (50%) nasal swabs from pigs experiencing a respiratory disease outbreak where M. hyopneumoniae had been diagnosed also gave a positive result with the nested PCR. To confirm that the amplified product was specific, 4 nested PCR products were purified, sequences were determined and aligned, and they were confirmed to be from M. hyopneumoniae.     

Use of a polymerase chain reaction for detection of Mycoplasma dispar in the nasal mucus of calves.

A polymerase chain reaction (PCR) assay was developed for the detection of Mycoplasma dispar in nasal mucus samples collected from calves. The target DNA sequence was the 16S rRNA gene, and the fragment was selected within a region of high polymorphism. The specificity and detection limit of the method were determined. This method was then used for the detection of M. dispar in nasal swabs collected from 301 calves, including 155 clinical samples from animals showing signs of respiratory disease and 146 samples from healthy animals. PCR with generic primers was applied to the detection of Mollicutes, followed by the detection of M. dispar. Mollicutes were detected in 52.05% of clinical samples from healthy animals and in 90.96% of samples from sick animals. Mycoplasma dispar was detected in 6.16% of healthy animals and in 34.84% of sick animals. The PCR assay was useful in verifying the presence of M. dispar in calves and may be a useful tool in monitoring this mycoplasma in cattle herds.