title: Development and clinical validation of a multiplex real-time PCR assay for herpes simplex and varicella zoster virus.
abstract: Herpes simplex virus (HSV) and varicella zoster virus (VZV) are related members of the Herpesviridae family and are well-documented human pathogens causing a spectrum of diseases, from mucocutaneous disease to infections of the central nervous system. This study was carried out to evaluate and validate the performance of a multiplex real-time polymerase chain reaction (PCR) assay in detecting and differentiating HSV1, HSV2, and VZV from clinical samples. Consensus PCR primers for HSV were designed from the UL30 component of the DNA polymerase gene of HSV, with 2 separate hydrolysis probes designed to differentiate HSV1 and HSV2. Separate primers and a probe were also designed against the DNA polymerase gene of VZV. A total of 104 clinical samples were available for testing by real-time PCR, conventional PCR, and viral culture. The sensitivity and specificity of the real-time assay was calculated by comparing the multiplex PCR result with that of a combined standard of virus culture and conventional PCR. The sensitivity of the real-time assay was 100%, with specificity ranging from 98% to 100% depending on the target gene. Both PCR methods detected more positive samples for HSV or VZV, compared with conventional virus culture. This multiplex PCR assay provides accurate and rapid diagnostic capabilities for the diagnosis and differentiation of HSV1, HSV2, and VZV infections, with the presence of an internal control to monitor for inhibition of the PCR reaction.
authors.affiliation: Departments of *Laboratory Medicine ‡Dermatology, Changi General Hospital †Department of STI Control, National Skin Centre, Singapore, Singapore.
authors.forename: Thean Yen
authors.initials: TY
authors.lastname: Tan
authors.forename: Hao
authors.initials: H
authors.lastname: Zou
authors.forename: Danny Chee Tiong
authors.initials: DC
authors.lastname: Ong
authors.forename: Khor Jia
authors.initials: KJ
authors.lastname: Ker
authors.forename: Martin Tze Wei
authors.initials: MT
authors.lastname: Chio
authors.forename: Rachael Yu Lin
authors.initials: RY
authors.lastname: Teo
authors.forename: Mark Jean Aan
authors.initials: MJ
authors.lastname: Koh
mesh_terms: D017931:DNA Primers / Q000235:genetics; D006561:Herpes Simplex / Q000175:diagnosis* / Q000821:virology; D006562:Herpes Zoster / Q000175:diagnosis* / Q000821:virology; D014645:Herpesvirus 3, Human / Q000235:genetics / Q000302:isolation & purification*; D006801:Humans; D025202:Molecular Diagnostic Techniques / Q000379:methods*; D060885:Multiplex Polymerase Chain Reaction / Q000379:methods*; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity; D018139:Simplexvirus / Q000235:genetics / Q000302:isolation & purification*
chemical_list: D017931:DNA Primers