title: [Rapid detection of influenza virus N2 subtype by fluorescence quantitative RT-PCR].
abstract: OBJECTIVE
  Developing a rapid method to detect influenza virus N2 subtype by fluorescence real-time quantitative RT-PCR.
  
  
  METHODS
  According to conservative sequences of NA gene of influenza virus N2 subtype, a pair primers and Taq-man probe were designed, respectively. Using one step RT-PCR kit to set up real-time RT-PCR system for detection of influenza virus N2 subtype, after the standard quantitative curve of the assay was established using 10-fold serial dilution of TCID50, the sensitivity was determined. The specificity and test for influenza virus illness (ILI) samples were also determined using this RT-PCR system.
  
  
  RESULTS
  The sensitivity of detection influenza virus N2 subtype was 2.56 x 10(-6) and the regression coefficient of the quantitative curve was 0.997. The amplification efficiency and specificity of this assay was 99.9% and 100%, respectively. The real-time RT-PCR for N2 subtype results of ILI samples was in accordance with HAI method completely.
  
  
  CONCLUSIONS
  The detection system based on real-time RT-PCR could be utilized to rapidly and sensitively detect influenza virus N2 subtype.
authors.affiliation: Shenzhen Center for Disease Control and Prevention, Shenzhen 518020, China.
authors.forename: Shisong
authors.initials: S
authors.lastname: Fang
authors.forename: Xiaowen
authors.initials: X
authors.lastname: Cheng
authors.forename: Jianfan
authors.initials: J
authors.lastname: He
authors.forename: Xing
authors.initials: X
authors.lastname: Lv
mesh_terms: D005453:Fluorescence; D053122:Influenza A Virus, H3N2 Subtype / Q000302:isolation & purification*; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity