驽巴贝斯虫病巢式PCR检测方法的研究

针对驽巴贝斯虫（Babesia caballi）rap—1基因序列设计内外两对引物，从实验室感染驽巴贝斯虫的马匹上采集全血提取DNA，采取两次扩增的方法，获得222bp基因片段，经测试此靶序列为驽巴贝斯虫特异性基因片段。采用本研究方法对已知的阳性马匹和阴性马匹进行检测，准确率为100％。     

马驽巴贝斯虫PCR和qPCR检测方法的建立

马驽巴贝斯虫是一种寄生于马属动物的血液原虫,给马产业造成巨大的经济损失。本研究旨在建立两种高效、可靠的PCR诊断技术,为进一步提高口岸检疫工作效率奠定基础。根据马驽巴贝斯虫Bc48基因序列,设计了一对特异性引物和荧光探针,建立了PCR和qPCR检测方法,测试了两种方法的特异性、灵敏性、稳定性。结果显示：建立的两种方法均具有良好的特异性;PCR方法的最低检出限为4.04×10² copies/μL,qPCR方法的最低检出限为4.04×10¹ copies/μL;对33份马血样品进行检测,结果qPCR检出的阳性样品数为23份(69.7%),而PCR检出的阳性样品数为9份(27.3%)。表明两种方法均可成功用于马驽巴贝斯虫的检验,但是荧光定量PCR方法的灵敏度明显优于PCR方法。     

驽巴贝斯虫病巢式POR检测方法的研究

针对驽巴贝斯虫(Babesia caballi)rap-1基因序列设计内外两对引物,从实验室感染驽巴贝斯虫的马匹上采集全血提取DNA,采取两次扩增的方法,获得222bp基因片段,经测试此靶序列为驽巴贝斯虫特异性基因片段。采用本研究方法对已知的阳性马匹和阴性马匹进行检测,准确率为100%。     

驽巴贝斯虫病巢式POR检测方法的研究

针对驽巴贝斯虫(Babesia caballi)rap-1基因序列设计内外两对引物,从实验室感染驽巴贝斯虫的马匹上采集全血提取DNA,采取两次扩增的方法,获得222bp基因片段,经测试此靶序列为驽巴贝斯虫特异性基因片段.采用本研究方法对已知的阳性马匹和阴性马匹进行检测,准确率为100%.     

新疆部分地区马驽巴贝斯虫病感染PCR检测调查

为了解新疆部分地区马匹感染马驽巴贝斯虫病的流行情况,通过PCR方法对不同地区所采集的样品进行检测,并对不同地区和不同年龄段马驽巴贝斯虫感染情况进行单因素方差分析。结果显示,所检测的504份马血样中,54份血样为阳性,阳性率为10.71%。其中北疆昭苏种马场、阿勒泰、吐鲁番托克逊马驽巴贝斯虫阳性率分别为20.61%、5.17%、0;巴音布鲁克牧场、和静地区马驽巴贝斯虫阳性率分别为0和8.59%。从阳性样品中都检测到了驽巴贝斯虫BC48基因片段,与已知序列的同源性为99%。X≤3,3X≤6,6X≤9,X9四个年龄段马驽巴贝斯虫感染率分别为9.76%、10.53%、11.21%和11.65%。单因素方差分析结果表明,昭苏种马场与阿勒泰、巴音布克牧场分别存在极显著性差异(P0.01);巴音布鲁克牧场与和静也存在极显著性差异(P0.01);昭苏种马场与吐鲁番托克逊存在显著性差异(P0.05),其余各地方差异不显著。各个年龄段马驽巴贝斯虫感染无显著性差异。本试验的研究数据可为研究新疆马驽巴贝斯虫分布特点提供数据支撑。     

马驽巴贝斯虫病的诊断和治疗

１９９９年春季以来,我院接连收治１０余例以高热、贫血、黄疸等为主要特征的马匹疫病,实验室诊断确诊为马驽巴贝斯虫病,后经治疗全部治愈,现将情况介绍如下。１　发病情况吉林省左家地区属半山区,春季林地草场存在大量森林革蜱,但本院从有记录的１９９３年以来,尚未收治过患梨形虫病的马匹。１９９９年春季以来陆续有马匹发病,主要表现食欲减退,体温升高,经过抗生素或清热泻火类中药治疗无效,遂来我院就诊。２　临诊症状发病初期病马精神沉郁,饮食欲减退,但二便均正常,体温升高达３９－５～４１－８℃,心率每分钟达７０～…     

马驽巴贝斯虫ddPCR检测方法的建立

马驽巴贝斯虫(Babesia caballi)病是马属动物的一种血液原虫病,被农业农村部列为二类动物疫病.本研究旨在建立一种针对马驽巴贝斯虫病的ddPCR检测技术.利用马驽巴贝斯虫特异性引物及探针对反应体系进行优化,测试了方法的特异性、稳定性及灵敏性,对30份可疑样品进行了初步检测.结果显示,该方法具有较好的稳定性,最...     

一例马混合感染驽巴贝斯虫与马巴贝斯虫病及并发症的诊治

从外地新购的马，混合感染驽巴贝斯虫、马巴贝斯虫，由于早体代谢产物的刺激与渐进性贫血，而引发一系列并发症：心衰、肺水肿、出血性素质致肠驰缓。经实验室检查确诊后，用黄色素、贝尼尔驱杀致病体并采用补液、止血、通便、强心等一系列对症治疗措施及中兽医辩证治疗后，该病例救治成功。     

马泰勒虫和弩巴贝斯虫双重荧光定量PCR检测方法的建立

马梨形虫病(EP)是由巴贝斯虫属的驽巴贝斯虫(B.caballi)和泰勒虫属的马泰勒虫(T.equi)感染引起的蜱传马属动物疾病.为建立EP两种病原的双重荧光定量PCR检测方法,本研究根据GenBank中T.equi和B.caballi 18SrRNA基因序列设计特异性引物和探针,经过反应体系和条件优化,建立了能够同时...     

马泰勒虫病PCR检测方法的建立和应用

为寻求一种快速、有效的马泰勒虫 (Theileria equi,T.equi) PCR检测方法。基于马泰勒虫18S rRNA基因序列,在其V4高变区设计特异性引物Te-18F、Te-18R,通过PCR技术获得了531 bp的核酸片段。用该引物对马泰勒虫、马泰勒虫和驽巴贝斯虫混合样本、驽巴贝斯虫、尤氏泰勒虫、中华泰勒虫、环形泰勒虫、绵羊泰勒虫、吕氏泰勒虫和瑟氏泰勒虫基因组模板进行特异性试验。同时对马泰勒虫基因组模板进行不同浓度稀释后扩增,以便于确定试验的敏感性。用本试验建立的方法与常规显微镜镜检方法对45份马属动物血样进行检测。特异性试验显示,在被检测的9个样本中,只有马泰勒虫及马泰勒虫和驽巴贝斯虫混合模板中扩增出了符合大小的特异核酸片段。驽巴贝斯虫、尤氏泰勒虫、中华泰勒虫、环形泰勒虫、绵羊泰勒虫、吕氏泰勒虫和瑟氏泰勒虫的扩增结果均为阴性。灵敏度试验结果表明,PCR对马泰勒虫的扩增效率可达到10^-13。对本试验建立的PCR检测马泰勒虫方法评估结果显示,PCR对马泰勒虫的检出率为17.78%(8/45),显微镜镜检结果只有8.89%(4/45)两者的符合率为100%。本试验建立的马泰勒虫PCR检测方法不失,为一种好的检测方法。     

基于等位基因特异性PCR原理建立鸡白痢沙门氏菌PCR方法

根据鸡白痢沙门氏菌与鸡伤寒沙门氏菌的rfbS基因在第237和598位碱基的不同,设计和合成等位基因特异性PCR引物,建立快速检测鸡白痢沙门氏菌的PCR方法,并应用该法对鸡白痢沙门氏菌临床分离样品进行了PCR鉴定。结果显示,该PCR方法能特异性地鉴定鸡白痢沙门氏菌,检测灵敏度达18 pg/μL DNA,4.7×10⁴ CFU/mL菌液,表明建立的等位基因特异性PCR方法能准确而快速地鉴定鸡白痢沙门氏菌。     

3种禽支原体多重PCR检测方法的建立及应用

从鸡毒支原体、鸡滑液囊支原体和火鸡支原体 3种致病性支原体液体培养物中提取DNA,用特定引物分别和组合进行PCR,均得到了特异性扩增产物,片段大小分别为732、207和850 bp。直接用液体培养物进行PCR亦得到了一致的电泳条带。试验结果表明,建立的PCR方法可用于上述3种支原体临床感染的鉴别诊断。ELISA血清学检测和气管拭子PCR检测的比较结果表明,该PCR方法可用于临床MG检测。     

猪传染性胸膜肺炎放线杆菌PCR检测试剂盒的研制

根据GenBank中猪传染性胸膜肺炎放线杆菌apxⅣA基因序列,设计了1对引物,通过对PCR反应条件进行优化,研制了检测猪传染性胸膜肺炎放线杆菌的PCR试剂盒。该试剂盒扩增的阳性条带为600 bp,特异性与敏感性结果显示,该PCR检测试剂盒的最低核酸检测量为50 CFU/mL,而对金黄色葡萄球菌、链球菌、多杀性巴氏杆菌、鼠伤寒沙门氏菌、副猪嗜血杆菌、大肠杆菌的扩增结果均为阴性。-20℃至少可保存12个月,且重复性良好。应用该PCR试剂盒对41份临床样本进行了检测,其PCR检测结果与细菌学检测结果相一致。结果表明,猪传染性胸膜肺炎放线杆菌PCR检测试剂盒能够对APP临床样品进行快捷、灵敏、准确的检测。     

Establishment and Primary Application of Duplex PCR Assay to Detect Procine Pseudorabies Virus

In order to detect the procine pseudorabies virus (PRV) infection and differentiate virulent and avirulent PRV, a duplex PCR method was established with two pairs of specific primers designed based on the conserved sequences of gE and gB genes of PRV.Optimize the reaction conditions by adjusting concentration of primers from 0.2 to 1.4 μL, each time adding 0.2 μL and temperature of annealing from 56 to 60 ℃, added 1 ℃ each time, and so on.The results showed that the suitable annealing temperature was 56 ℃ and the suitable primer dose was 1 μL.Two special fragments of 316 bp (PRV gE) and 432 bp (PRV gB) were amplified by the optimized duplex PCR.The specific tests showed that no PCR products were detected for PCV2, PTV, CSFV, PPV, PRRSV and E.coli.The sensitivity test showed that DNA used for the duplex PCR might be as low as 4.4×10³ copy/μL for PRV gE and 3.3×10³ copy/μL for PRV gB.The sensitivity of the duplex PCR was close to the single PCR.Fifty-six clinical samples of sick pigs from different areas in Guangdong and Guangxi province were detected by the duplex PCR and the virulent detection rate was 53.6% (30/56) for PRV and the negative rate was 46.4%(26/56), and there was no attenuated PRV infection.     

鉴别猪伪狂犬病病毒的双重PCR方法的建立及初步应用

为了检测猪伪狂犬病病毒(pseudorabies virus,PRV)的感染情况,并进行强弱毒株的鉴别诊断,本研究建立了快速、简便、灵敏度高、特异性强的鉴别猪PRV的双重PCR方法。针对PRVgE和gB基因序列,分别设计了2对特异性引物,通过对退火温度(50~60℃,按照1℃递增)、引物浓度(0.2~1.4μL,依次增加0.2μL)的优化,结果表明,双重PCR反应的最佳退火温度为56℃、最适引物添加量为1μL。特异性试验结果表明,该方法可以扩增出PRVgE(316bp)和gB(432bp)的目的片段,对PCV2、PTV、CSFV、PPV、PRRSV、大肠杆菌的DNA或cDNA均无扩增。敏感性试验结果表明,PRVgE和gB的最低核酸检出量分别为4.4×10³和3.3×10³拷贝/μL,与单一PCR方法的敏感性相近。应用该方法对广东、广西地区临床送检的56份组织样品进行检测,检测结果显示,强毒感染阳性率为53.6%(30/56),阴性率为46.4%(26/56),未发现有弱毒感染。     

Development of loop-mediated isothermal amplification (LAMP) method for diagnosis of equine piroplasmosis

Loop-mediated isothermal amplification (LAMP) is a novel nucleic acid method whereby DNA is amplified with high specificity, efficiency, and rapidity under isothermal conditions using a set of four specifically designed primers and a DNA polymerase with strand displacement activity. In this study, we used LAMP primer sets designed from EMA-1 and Bc 48 genes for detection of Theileria equi and Babesia caballi infections, respectively. These primer sets specifically amplified DNA of the respective parasites. Both primer sets amplified T. equi and B. caballi up to 10(-6) dilution of 10-fold serially diluted samples. Furthermore, DNA extracted from blood collected from a horse experimentally infected with T. equi was amplified by a T. equi LAMP primer set from days 2 to 35 post-infection, demonstrating the high sensitivity of these primers. Of 55 samples collected from China, 81.8% and 56.3% were positively detected by LAMP for T. equi and B. caballi infections, respectively. In contrast, 91.8% and 45.9% of the 37 samples collected from South Africa were LAMP positive for T. equi and B. caballi, respectively. These results suggest that LAMP could be a potential diagnostic tool for epidemiological studies of equine piroplasmosis.     

牛卵形巴贝斯虫PCR检测方法的建立及初步应用

为建立牛卵形巴贝斯虫(B.ovata)快速检测方法,本研究根据GenBank中登录的B.ovata CCTη基因序列设计引物,建立了PCR检测方法。对该方法的最佳反应条件进行优化,并进行特异性、敏感性及临床样本检测试验。结果表明,建立的PCR方法扩增B.ovata CCTη基因片段大小为1 008 bp,与参考株序列同源性为100%。该方法对牛巴贝斯虫、牛双芽巴贝斯虫、牛瑟氏泰勒虫基因组DNA扩增结果均为阴性。最低可以检测样品中34个拷贝的DNA。通过对49份临床样本的检测,该方法比姬姆萨染色镜检阳性率高8.2%。本实验为B.ovata的诊断提供了一种特异、敏感的检测技术。     

Real-time polymerase chain reaction based on msa2c gene for detection of Babesia bovis

This paper reports a quantitative real-time polymerase chain reaction (q-PCR) based on the msa2c gene and standardized with Platinum SYBR Green/ROX for the detection of Babesia bovis in cattle. The msa2c q-PCR amplified a DNA fragment with average dissociation temperature of 77.41°C (± 0.25°C). No amplification was detected when DNA from B. bigemina, A. marginale or Bos taurus was used as the template. The detection limit of the msa2c q-PCR was 1000 copies per ml of blood sample, with a linear correlation between the number of msa2c copies and threshold cycle. The comparison between msa2c q-PCR and conventional PCR for cytochrome b revealed 88.8% agreement, with a Kappa index of 0.75. In the comparison between msa2c q-PCR and an enzyme-linked immunosorbent assay (ELISA) with semi-purified B. bovis antigen, agreement was 96.3% and the Kappa index was 0.91. The agreement between three tests was 85.8%. The msa2c q-PCR detected a higher number of positive cattle than conventional PCR in an enzootically stable area, but did not differ significantly from ELISA. No significant differences were detected between the three diagnostic tests with cattle from an enzootically unstable area. All animals raised on a tick-free facility were negative for B. bovis in the three tests. These results suggest that msa2c q-PCR is a useful test for the detection of B. bovis infection.