Prospective Evaluation of a Novel Multiplex Real-time PCR Assay for Detection of Fifteen Respiratory Pathogens-duration of Symptoms Significantly Affects Detection Rate

Overview

Journal J Clin Virol

Specialty Microbiology

Date 2010 Jan 19

PMID 20080440

Citations 37

Authors

Robin Brittain-Long

Johan Westin

Sigvard Olofsson

Magnus Lindh

Lars-Magnus Andersson

Affiliations

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Abstract

Background: Nucleic acid amplification techniques have improved the diagnostic possibilities in respiratory tract infections, although their clinical applicability is not yet fully defined. We have evaluated a multiplex real-time PCR method for the detection of 13 respiratory viruses and 2 bacteria (Mycoplasma and Chlamydophila) in a clinical setting.

Objectives: The aim of the present study was to evaluate the diagnostic performance and clinical use of a novel multiplex PCR method in adults with community-acquired respiratory viral infection, and the impact of duration of symptoms on detection rates.

Study Design: Nasopharyngeal swab samples were prospectively collected from 209 adult outpatients with respiratory infections and 100 asymptomatic controls.

Results: An infectious agent was identified in 43% of samples from patients and 2% of asymptomatic controls. The detection rate was significantly higher in samples from patients with a duration of symptoms of 6 days or less (51%) than in samples from patients with a duration of symptoms of 7 days or more (30%, p<0.01). For human corona viruses, and influenza virus A and B there was a correlation between the amount of virus in each patient sample as measured Ct values and duration of symptoms.

Conclusions: Duration of symptoms significantly affects the detection rate of respiratory pathogens by multiplex real-time PCR in nasopharyngeal swab samples from adult patients with respiratory infections. Our finding should be taken into account when using these tests in clinical practise.

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