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1.
Virus Genes - Zika virus (ZIKV) is a mosquito-borne flavivirus, which is a pathogen affecting humans in Africa, Asia, and America. It is necessary to detect ZIKV with a rapid and sensitive... 相似文献
2.
Rapid detection of varicella-zoster virus infection by a loop-mediated isothermal amplification method 总被引:5,自引:0,他引:5
Okamoto S Yoshikawa T Ihira M Suzuki K Shimokata K Nishiyama Y Asano Y 《Journal of medical virology》2004,74(4):677-682
The reliability of varicella-zoster virus (VZV) loop-mediated isothermal amplification (LAMP) was evaluated for rapid diagnosis of viral infection. VZV-specific primers only amplified VZV DNA; no LAMP products were observed in reactions performed with other viral DNA templates. The specificity of this method was confirmed by two independent determinations, agarose gel electrophoresis and a turbidity assay. The sensitivity of VZV LAMP, determined by agarose gel electrophoresis, were 500 copies/tube. Detection using the turbidity assay, however, gave a sensitivity of 1,000 copies/tube. After these initial validation studies, reliability of VZV LAMP was evaluated for the detection of viral DNA in clinical specimens. Thirty-two swab samples collected from patients with vesicular skin eruptions were tested for VZV DNA. VZV was confirmed in sample numbers 10-32 by VZV real-time PCR, a previously established technique. VZV LAMP products were detected using turbidity from samples 13 to 32 (sensitivity; 87.0%, specificity; 100%, positive predictive value; 100%, negative predictive value; 75%). Although low levels of VZV DNA could be detected in the three samples exhibiting divergent results (samples numbers 10-12), no VZV LAMP product was detected in these samples, indicating a higher detection limit for this assay. Requirement of a DNA extraction step in the VZV LAMP method was examined in next experiment. The turbidity assay detected a VZV LAMP product in all of the 20 positive swab samples (samples numbers 13-32), regardless of DNA extraction. 相似文献
3.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
4.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
5.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
6.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
7.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
8.
应用环介导等温扩增法快速检测O139群霍乱弧菌 总被引:1,自引:0,他引:1
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
9.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
10.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
11.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
12.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
13.
目的 建立一种适合基层检验部门及小型实验室使用的快速检测O139群霍乱弧菌的方法.方法 应用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP),针对O139霍乱弧菌wbfR基因设计4条引物(2条内引物、2条外引物);优化LAMP反应条件和反应体系,对反应体系中的引物、dNTP、Mg2+/Mn2+离子及Calcium等浓度进行优化;并对13株种系背景明确的霍乱弧菌不同实验对照株、30株O139群霍乱弧菌地方分离株、10株O1群霍乱弧菌地方分离株、32株其他肠道菌进行检测,验证该方法的特异性;通过肉眼目测或电泳检测比较结果.结果 所有O139群霍乱弧菌经LAMP榆测均呈绿色并电泳有阶梯状条带为阳性,O1群霍乱弧菌及其他肠道菌均检测呈橙色并电泳无相应条带为阴性;该体系最低检测限为63 CFU/反应;检测结果在白光下通过肉眼即可判断;从菌株核酸的提取至检测完成仅需1.5 h左右.结论 本研究建立的LAMP方法能够快速、灵敏、特异地检测O139群霍乱弧菌,无需昂贵的仪器,简单方便,非常适合基层检验部门或小型实验室以及流行病学人员于应急车上或现场监测等使用,值得推广. 相似文献
14.
Rapid diagnosis of herpes simplex virus infection by a loop-mediated isothermal amplification method 总被引:18,自引:0,他引:18
Enomoto Y Yoshikawa T Ihira M Akimoto S Miyake F Usui C Suga S Suzuki K Kawana T Nishiyama Y Asano Y 《Journal of clinical microbiology》2005,43(2):951-955
Primers for herpes simplex virus type 1 (HSV 1)-specific loop-mediated isothermal amplification (LAMP) method amplified HSV-1 DNA, while HSV-2-specific primers amplified only HSV-2 DNA; no LAMP products were produced by reactions performed with other viral DNAs. The sensitivities of the HSV-1- and HSV-2-specific LAMP methods, determined by agarose gel electrophoresis, reached 500 and 1,000 copies/tube, respectively. The turbidity assay, however, determined the sensitivity of the HSV-1- and HSV-2-specific LAMP methods to be 1,000 and 10,000 copies/tube, respectively. After initial validation studies, 18 swab samples (in sterilized water) collected from patients with either gingivostomatitis or vesicular skin eruptions were examined. HSV-1 LAMP products were detected by agarose gel electrophoresis in the 10 samples that also demonstrated viral DNA detection by real-time PCR. Nine of these 10 samples exhibited HSV-1 LAMP products by turbidity assay. Furthermore, both the agarose gel electrophoresis and the turbidity assay directly detected HSV-1 LAMP products in 9 of the 10 swab samples collected in sterilized water. Next, we examined the reliability of HSV type-specific LAMP for the detection of viral DNA in clinical specimens (culture medium) collected from genital lesions. HSV-2 was isolated from all of the samples and visualized by either agarose gel electrophoresis or turbidity assay. 相似文献
15.
Rapid detection of herpes simplex virus DNA in cerebrospinal fluid: comparison between loop-mediated isothermal amplification and real-time PCR 总被引:3,自引:0,他引:3
Kimura H Ihira M Enomoto Y Kawada J Ito Y Morishima T Yoshikawa T Asano Y 《Medical microbiology and immunology》2005,194(4):181-185
Loop-mediated isothermal amplification (LAMP) is a novel nucleic acid amplification method that amplifies DNA with high specificity, efficiency, and speed under isothermal conditions. To evaluate the usefulness of LAMP for diagnosing central nervous system infection with herpes simplex virus (HSV), we compared the LAMP method with real-time PCR, using samples that were previously tested by nested PCR. We examined 69 cerebrospinal fluid (CSF) samples from patients suspected of having HSV infection of the central nervous system. The results of the real-time PCR analysis and nested PCR assay were in complete accord. When nested PCR was regarded as standard, the sensitivity of LAMP was 81%, the specificity was 100%, the positive predictive value was 100%, and the negative predictive value was 90%. Although further improvement is necessary for the wide spread use, the LAMP method might be applicable to diagnosis of HSV infection of the central nervous system. 相似文献
16.
Sensitive and rapid detection of the new Delhi metallo-beta-lactamase gene by loop-mediated isothermal amplification 总被引:1,自引:0,他引:1
Liu W Zou D Li Y Wang X He X Wei X Shao C Li X Shang W Yu K Liu D Li Y Guo J Yin Z Yuan J 《Journal of clinical microbiology》2012,50(5):1580-1585
New Delhi metallo-β-lactamase 1 (NDM-1), which is associated with resistance to carbapenem, was first reported in 2008. A sensitive and rapid molecular assay to detect the plasmid bla(NDM-1) in clinical isolates is needed to control its spread. We describe a loop-mediated isothermal amplification (LAMP) assay for the rapid detection of bla(NDM-1) from pure culture and sputum, urine, and fecal samples. Eight sets of primers were designed to recognize six or eight distinct sequences on target bla(NDM-1), and one set was selected as the most appropriate set of primers for its rapid detection. The specificity and sensitivity of the primers in the LAMP reactions for bla(NDM-1) detection were determined. The sensitivity of the LAMP assay for bla(NDM-1) detection in sputum, urine, and fecal samples was also tested. Two methods, namely, monitoring of turbidity and addition of calcein to the reaction tube, were used to determine negative and positive results. The results showed that target DNA was amplified and visualized by the two detection methods within 70 min at an isothermal temperature of 65°C. The sensitivity of LAMP, with a detection limit of 10.70 pg/μl DNA, was 100-fold greater than that of PCR. Thirteen infection bacterial strains without bla(NDM-1) were selected for testing of specificity, and the results of the amplification were negative, which showed that the primers had good levels of specificity. The LAMP method reported here is demonstrated to be a potentially valuable means for the detection of bla(NDM-1) and rapid clinical diagnosis, being fast, simple, and low in cost. 相似文献
17.
Discriminating between varicella-zoster virus vaccine and wild-type strains by loop-mediated isothermal amplification
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Higashimoto Y Ihira M Ohta A Inoue S Usui C Asano Y Yoshikawa T 《Journal of clinical microbiology》2008,46(8):2665-2670
The loop-mediated isothermal amplification (LAMP) method was developed to distinguish between the varicella-zoster virus (VZV) vaccine (vOka) strain and wild-type strains. Two single nucleotide polymorphisms (SNPs) (nucleotide [nt] 105705 for VR-1 VZV LAMP and nt 106262 for VR-2 VZV LAMP) located in the open reading frame 62 gene were selected as LAMP targets. Amplified vOka DNA demonstrated a typical ladder pattern; however, no LAMP product was detected in reactions performed with DNAs from other human herpesviruses by either VR-1 VZV LAMP or VR-2 VZV LAMP. This result was confirmed by a turbidity assay. The sensitivities of both VR-1 and VR-2 VZV LAMP determined by either the turbidity assay or agarose gel electrophoresis were 100 copies per reaction. To discriminate the vOka strain from wild-type strains, VR-1 and VR-2 VZV LAMP products were digested with the appropriate restriction enzymes (SacII for VR-1 LAMP and SmaI for VR-2 LAMP). The digested products were clearly different in the vOka strain and wild-type strains. To evaluate the utility of the LAMP methods for rapid differentiation, viral DNA (without DNA extraction) in swab samples was directly tested. Wild-type VZV DNA was detected in 20 swab samples by either VR-1 VZV LAMP or VR-2 VZV LAMP. Sequence analysis confirmed the expected SNPs in the LAMP products amplified from the vOka strain and the five wild-type strains. 相似文献
18.
Sensitive and specific detection of Yersinia pseudotuberculosis by loop-mediated isothermal amplification 总被引:3,自引:0,他引:3
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Horisaka T Fujita K Iwata T Nakadai A Okatani AT Horikita T Taniguchi T Honda E Yokomizo Y Hayashidani H 《Journal of clinical microbiology》2004,42(11):5349-5352
We developed a loop-mediated isothermal amplification method able to detect Yersinia pseudotuberculosis strains in 30 min by using six primers designed by targeting the inv gene. This method is more sensitive than PCR and might be a useful tool for detecting and identifying Y. pseudotuberculosis. 相似文献
19.
Seiko Iwata Yukiko Shibata Jun-ichi Kawada Shinya Hara Yukihiro Nishiyama Tsuneo Morishima Masaru Ihira Tetsushi Yoshikawa Yoshizo Asano Hiroshi Kimura 《Journal of clinical virology》2006,37(2):128-133
BACKGROUND: The loop-mediated isothermal amplification (LAMP) method is a novel technique for the amplification of specific DNA sequences. OBJECTIVES: To establish the LAMP method for amplifying Epstein-Barr virus (EBV) DNA and to examine its reliability for the detection of EBV DNA in clinical specimens. STUDY DESIGN: Sera from 108 patients, who were initially suspected of primary EBV infection, were tested by the EBV LAMP method, and the results were compared with those of the real-time PCR assay. Serological examination was regarded as the standard diagnostic method. RESULTS: To diagnose primary EBV infection, the sensitivity of LAMP was 86.4% and the specificity was 100%. The sensitivity of the real-time PCR assay was 84.1% and the specificity was 98.4%. Longitudinal analysis showed that the detection rate of EBV DNA in serum by the LAMP method decreased with time in accordance with the decrease of the EBV load. EBV DNA could not be detected in serum 40 days after onset of symptoms. CONCLUSIONS: These results indicate that the sensitivity and specificity of the LAMP method are comparable to those of real-time PCR and that detecting EBV DNA in serum by this method is potentially useful for diagnosing primary EBV infection. 相似文献