实时荧光定量PCR检测儿童下呼吸道感染的WU多瘤病毒

目的 建立并应用检测儿童下呼吸道感染WU多瘤病毒(WU polyomavirus)的实时荧光定量PCR( real-time fluorescent quantitative PCR,FQ-PCR)方法.方法 选择WU多瘤病毒的VP2基因作为检测的目标基因,设计FQ-PCR引物和检测探针,以重组质粒为标准品建立标准曲线,并对该方法的特异性、灵敏度、重复性进行评价；应用该方法对温州医学院附属温岭医院收集的临床下呼吸道感染患儿的痰液、咽拭子846份及血清标本846份进行定量检测.结果 本研究建立FQ-PCR检测方法,质粒标准曲线的方差系数为0.998,灵敏度可达到50拷贝；应用该方法检测700份痰液标本,检测到7例阳性标本,146份咽试子标本中未检测到阳性标本,总阳性率为1.00％ (7/700),846份血清标本未检测到阳性标本.结论 本研究建立的FQ-PCR方法可以特异、快速、灵敏地对儿童下呼吸道感染的WU多瘤病毒进行定量检测；痰液标本较咽拭子或血清标本更适用于WU多瘤病毒感染的核酸检测.

Detection of WU Polyomavirus in children with low respiratory tract Infections using real-time fluorescent quantitative PCR

Objective Development and application of a real time fluorescent quantitative PC R （FQ-PCR） assay for detecting WU polyomavirus in children with low respiratory tract infections. Methods The VP2 gene of WU polyomavirus was selected as the detection target,from which the real time primers and probes were designed. The standard curve was established by using recombinant plasmid as template. And the FQ-PCR assay for specific detection of WU polyomavirus was established. The specificity,sensitivity and reproducibility of the method were evaluated. Furthermore, the clinical specimens from children with respiratory tract infections collected in Wenling First People＇s Hospital were quantitatively detected using this method. Results In this study, the FQ-PCR method was established to detect a specific fragment in VP2gene of WU polyomavirus. The standard curve coefficient R2 was 0. 998. And this method can detect as low as 50 copies recombinant plasmid. The clinical specimens of sputum and throat swab from children with respiratory tract infections were quantitatively detected using this method. 7 sputum specimens were detected as WU polyomavirus positive in 700 sputum specimens,the positive ratio was 1.00% . No positive specimens were detected in 146 specimens of throat swabs and 846 blood samples from same patient population. Conclusion .The results indicated that the FQ-PCR assay method established in this study was specific, rapid and sensitive for detecting WU polyomavirus in children with lower respiratory tract infections. The sputum specimen is more suitable to be used for gene detection of WU polyomavirus than throat swab or blood.