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1.
采用双重荧光实时RT-PCR技术,建立一种简便易行的H9N2亚型禽流感病毒的快速鉴定方法。通过比对GenBank甲型禽流感病毒H9N2亚型的HA和NA基因序列,设计特异性针对HA和NA的引物,分别选用FAM和JOE两种不同荧光标记探针,构建双重实时荧光PCR一步法反应体系,同时检测样本中的HA和NA基因。结果显示:扩增曲线和特异性实验结果显示,该体系具有很好的扩增效率,且仅特异性识别H9N2亚型AIV的HA、NA基因,与相关病毒或其他亚型无交叉反应。采用重组质粒pMD19-T构建HA、NA阳性质粒,10倍梯度稀释液为模板,进行荧光定量PCR。结果证实,本研究所建立的双重荧光定量RT-PCR体系敏感性能达到10个RNA拷贝数。采用本方法检测60份感染动物样品及60份环境样品,与传统PCR方法相比,检测敏感性提高了100倍;与病毒分离鉴定方法比较,二者的鉴定结果完全吻合。该方法具有特异性强、灵敏度高、快速易操作等优点,是H9N2亚型禽流感病毒鉴定的有效方法。  相似文献   

2.
目的:对郑州市首例人感染H7N9禽流感病例进行实验室诊断和分析,以提高实验室应急检测能力。方法:采集郑州市管城区1例疑似病例的鼻、咽拭子样本,提取病毒RNA,采用甲、乙型流感通用引物和探针、季节性流感(包括H1N1、H3N2)特异性引物和探针、甲型H1N1流感特异性引物和探针以及H5N1和H7N9特异性引物和探针,以Real-time RT-PCR方法检测流感病毒核酸。结果:乙型流感、季节性流感(包括H1N1、H3N2)、甲型H1N1流感和H5N1高致病性禽流感扩增结果均为阴性;甲型流感通用引物和H7N9亚型流感病毒扩增结果均为阳性。结论:样本经河南省疾控中心与国家疾控中心复核检测,证实该患者为郑州市首例人感染H7N9禽流感病例。  相似文献   

3.
目的建立诺如病毒遗传组I型TaqMan-MGB探针实时荧光RT-PCR快速、特异、灵敏的检测方法,为疾病预防控制提供可靠的依据。方法根据GenBank诺如病毒遗传组Ⅰ型代表株保守序列设计特异引物对和TaqMan-MGB探针,建立一步法实时荧光RT-PCR快速检测反应体系,优化反应条件,评价反应体系的灵敏度、特异性、重复性,并与常规RT-PCR比较。结果诺如病毒遗传组Ⅰ型TaqMan-MGB探针实时荧光RT-PCR检测时限短,仅1h就出结果,与轮状病毒、腺病毒、星状病毒、甲肝病毒、诺如病毒遗传组Ⅱ型无交叉反应,最低检出下限为100拷贝/反应,比常规RT-PCR灵敏100倍,5份浓度不同的诺如病毒遗传组Ⅰ型标本重复检测5次,平均Ct值变异系数范围为0.39%~1.02%。结论诺如病毒遗传组Ⅰ型TaqMan-MGB探针实时荧光RT-PCR快速、特异、灵敏、重复性好,可应用于突发公共卫生应急检测和诺如病毒遗传组Ⅰ型监测,提高快速检测能力。  相似文献   

4.
目的 了解揭阳市外环境禽流感病毒动态分布情况和流行特点,评估人感染禽流感病毒的风险,为人禽流感防控提供科学依据。方法 按随机抽样的方法,对揭阳市2016—2020年5个县(市、区)禽类市场进行相关标本采集,用实时荧光定量(RT-PCR)对标本进行流感病毒A型检测,阳性标本再进行H5N6、H7N9、H9N2亚型禽流感病毒核酸检测。结果 揭阳市2016—2020年共采集外环境标本1 798份,甲型流感病毒(FluA)阳性标本660份,阳性率为36.71%;其中H5N6、H7N9、H9N2亚型阳性率分别为1.61%、1.28%和21.91%。普宁市和惠来县的外环境禽流感病毒阳性率较高,分别为54.14%和51.43%。揭西县的外环境禽流感病毒阳性率最低,为4.84%。不同类型标本检测阳性率最高为清洗禽类污水(47.09%)。结论 揭阳市禽类市场外环境中存在H5N6、H7N9、H9N2及多种亚型混合的禽流感病毒污染,禽流感病毒流行区域较广,存在感染人的风险,应继续加强外环境禽流感实时监测和城乡禽类市场卫生监管。  相似文献   

5.
目的对龙华新区H7N9强化监测的流感病例、外环境监测标本进行H5、H7和H9亚型禽流感病毒检测,了解禽流感病毒的暴露情况。方法利用实时荧光定量PCR对样本进行流感病毒的AB分型和禽流感病毒H5、H7、H9亚型核酸分型检测。结果在1 570份H7N9禽流感病毒强化监测样本中,检测出A型流感病毒阳性136份,阳性率为8.66%;B型流感病毒阳性86份,阳性率为5.48%;H5、H7、H9亚型核酸检测均为阴性。在278份外环境的检测样本中,禽流感病毒H7亚型阳性17份,H5和H9均为阴性。结论在龙华新区农贸市场的外环境中存在禽流感病毒H7亚型,人们存在感染的风险。目前在流感样病例和不明原因肺炎中尚未检出禽流感病毒H7亚型。  相似文献   

6.
目的建立高致病性禽流感H7和H9亚型荧光定量PCR方法。方法根据禽流感病毒(avian influenzavirus,AIV)HA-H7基因和HA-H9基因分别设计特异AIV H7和H9亚型特异荧光定量PCR引物和探针,优化反应体系和反应条件,分析该试剂的敏感性、特异性、重复性等。结果经优化反应体系和反应条件后,AIV H7试剂和AIV H9试剂的敏感性达到1×104.67EID50和1×103.80EID50水平,特异性与细胞培养敏感性类似;批内和批间精密度Ct值的CV值均远小于10%,可重复性良好。结论本项目研制的AIV H7和H9亚型的敏感性、特异性、重复性均好,适合在禽流感H7和H9亚型疫情和人类疑似禽流感病例中检测使用。  相似文献   

7.
目的 利用实时荧光RT-PCR技术,并通过系统的分析性能和临床性能评价,建立一种早期快速检测肠道病毒71型(EV71)的方法.方法 根据EV71基因组中编码衣壳蛋白VP1基因保守区序列设计一对引物和一条荧光探针,利用实时荧光RT-PCR技术建立了检测EV71的方法,并对扩增产物进行分析,同时进行灵敏度、特异性、精密度评价.在此基础上利用不同标本类型共1104例临床样本对本方法和RT-PCR方法进行对比分析.结果 本方法可以特异性的检测EV71,而对种属相近的或引起症状相似的其他病毒均无交叉反应.本方法检测灵敏度达到9.22×102 PFU/ml,不同浓度样本的Ct值的变异系数在1.4%~2.9%之间.1104例临床样本的研究显示本方法与RT-PCR方法检测结果的总符合率达到96.74%,阳性样本的检出率要高于RT-PCR方法.结论 本方法检测EV71具有灵敏度高、特异性强、精密度高、快速简便的特点,并与RT-PCR方法具有很好的符合率,在手足口病的早期快速诊断和疫情监测方面具有很好的应用前景.  相似文献   

8.
目的建立TaqMan探针实时荧光定量RT-PCR方法,测定猴免疫缺陷病毒(SIV)及SHIV病毒的RNA拷贝数。方法利用TaqMan探针,建立实时荧光定量RT-PCR方法,通过对本室SIV/SHIV病毒RNA定量外标准品RS的定量分析,优化反应体系,检测TaqMan探针实时荧光定量RT-PCR方法的灵敏度、特异性和重复性。结果该方法检测灵敏度可达4.60×101copies/μL,特异性及重复性良好,对同一样品进行16次重复检测,其循环阈值的平均标准偏差为0.066。结论TaqMan探针实时荧光定量RT-PCR法特异性、敏感性高,稳定性好,可用于定量测定猴免疫缺陷病毒(SIV)及SHIV病毒RNA载量。  相似文献   

9.
目的 建立TaqMan探针实时荧光定量RT-PCR方法,测定登革热病毒(DV)及DV病毒的RNA拷贝数.方法 利用TaqMan探针,建立实时荧光定量RT-PCR方法,通过对登革热病毒RNA定量外标准品的定量分析,优化反应体系.检测TaqMan探针实时荧光定量RT-PCR方法的灵敏度、特异性和重复性.结果 该方法检测灵敏度可达1×103 copies/mL,特异性及重复性良好,对同一样品进行5次重复检测,其循环阈值的平均标准偏差为O.792.结论 TaqMan探针实时荧光定量RT-PCR法特异性、敏感性高,稳定性好,可用于定量测定登革热病毒及DV RNA载量.  相似文献   

10.
目的对胶体金法、病毒分离培养法和荧光定量RT-PCR法等3种检测流感病毒方法和结果进行比较研究,筛选快速准确的检测方法,为流感监测与防控工作提供及时可靠的病原学依据。方法同时采用胶体金法、病毒分离培养法和荧光定量RT-PCR检测法对2012年深圳市龙岗区流感监测哨点医院采集的流感样病例样本进行检测,比较检测结果。结果荧光定量RT-PCR的流感病毒核酸检测阳性率为70.8%,其中98份为季节性H3N2流感病毒,51份为B型Victoria株,4份为B型Yamagata株;病毒分离培养法的阳性率为46.3%,分离出61株季节性H3N2流感病毒,35株B型Victoria株,4株B型Yamagata株;胶体金法检出率为3.7%。3种方法中,荧光定量RT-PCR的阳性率最高,病毒分离培养法次之,胶体金法阳性率最低。结论与病毒分离培养法和RT-PCR法相比,胶体金法并不适合单独用于诊断流感病毒感染,病毒分离培养法费时费力,荧光定量RT-PCR法有较高的敏感性和特异性,适用于流感疫情的病原学快速诊断。  相似文献   

11.
Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P< 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P< 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.  相似文献   

12.
Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P < 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (>0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P <0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P < 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.  相似文献   

13.
Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.  相似文献   

14.
Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.  相似文献   

15.
Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.  相似文献   

16.
A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care(~'4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.  相似文献   

17.
Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.  相似文献   

18.
Journal of Nanjing Medical University (English Edition) JNMU, sponsored by Nanjing Medical University, was established in 1987. It is a bimonthly comprehensive English medical journal published locally and abroad.Since 2007, Journal of Nanjing Medical University (English Edition )was granted Elsevier the full publishing and distribution rights worldwide for the Electronic Edition, excluding the People's Republic of China.  相似文献   

19.
目的:评价使用安心颗粒对急诊经皮冠状动脉介入术(PPCI)术后生活质量的影响.方法:将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组(术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次)和对照组(仅接受基础药物治疗).所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表(MIDAS)、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果:入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异(P>0.05);出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低(P<0.05);组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低(P<0.05).两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血(P>0.05).两组发生轻度血小板减少症的患者数比较无差异(P>0.05).结论:PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.  相似文献   

20.
Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P<0.01);the MAP decreased(P<0.01)and the HR increased drastically(P<0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.  相似文献   

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