Research Article

Virologica Sinica

, Volume 28, Issue 2, pp 97-102

Respiratory virus multiplex RT-PCR assay sensitivities and influence factors in hospitalized children with lower respiratory tract infections

  • Jikui DengAffiliated withShenzhen Children’s Hospital, Chongqing Medical UniversityDepartment of Laboratory Medicine, Memorial Sloan-Kettering Cancer Center
  • , Zhuoya MaAffiliated withShenzhen Children’s Hospital, Chongqing Medical University
  • , Wenbo HuangAffiliated withState Key Laboratory of Respiratory Diseases, Guangzhou Medical University
  • , Chengrong LiAffiliated withShenzhen Children’s Hospital, Chongqing Medical University
  • , Heping WangAffiliated withShenzhen Children’s Hospital, Chongqing Medical University
  • , Yuejie ZhengAffiliated withShenzhen Children’s Hospital, Chongqing Medical University
  • , Rong ZhouAffiliated withState Key Laboratory of Respiratory Diseases, Guangzhou Medical University Email author 
  • , Yi-Wei TangAffiliated withDepartment of Laboratory Medicine, Memorial Sloan-Kettering Cancer Center Email author 

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

Multiplex RT-PCR assays have been widely used tools for detection and differentiation of a panel of respiratory viral pathogens. In this study, we evaluated the Qiagen ResPlex II V2.0 kit and explored factors influencing its sensitivity. Nasopharyngeal swab (NPS) specimens were prospectively collected from pediatric inpatients with lower respiratory tract infections at the time of admission in the Shenzhen Children’s Hospital from May 2009 to April 2010. Total nucleic acids were extracted using the EZ1 system (Qiagen, Germany) and 17 respiratory viruses and genotypes including influenza A virus (FluA), FluB, parainfluenza virus 1 (PIV1), PIV2, PIV3, PIV4, respiratory syncytial virus (RSV), human metapneumovirus (hMPV), rhinoviruses (RhV), enteroviruses (EnV), human bocaviruses (hBoV), adenoviruses (AdV), four coronaviruses (229E, OC43, NL63 and HKU1), and FluA 2009 pandemic H1N1(H1N1-p) were detected and identified by the ResPlex II kit. In parallel, 16 real-time TaqMan quantitative RT-PCR assays were used to quantitatively detect each virus except for RhV. Influenza and parainfluenza viral cultures were also performed. Among the total 438 NPS specimens collected during the study period, one or more viral pathogens were detected in 274 (62.6%) and 201(45.9%) specimens by monoplex TaqMan RT-PCR and multiplex ResPlex, respectively. When results from monoplex PCR or cell culture were used as the reference standard, the multiplex PCR possessed specificities of 92.9–100.0%. The sensitivity of multiplex PCR for PIV3, hMPV, PIV1 and BoV were 73.1%, 70%, 66.7% and 55.6%, respectively, while low sensitivities (11.1%–40.0%) were observed for FluA, EnV, OC43, RSV and H1N1. Among the seven viruses/genotypes detected with higher frequencies, multiplex PCR sensitivities were correlated significantly with viral loads determined by the TaqMan RT-PCR in FluA, H1N1-p and RSV (p=0.011−0.000). The Qiagen ResPlex II multiplex RT-PCR kit possesses excellent specificity for simultaneous detection of 17 viral pathogens in NPS specimens in pediatric inpatients at the time of admission. The sensitivity of multiplex RT-PCR was influenced by viral loads, specimen process methods, primer and probe design and amplification condition.

Keywords

Multiplex RT-PCR Respiratory viral loads Cell culture Lower respiratory tract infection