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J Clin Virol. 2008 Jun;42(2):190-3. doi: 10.1016/j.jcv.2008.01.013. Epub 2008 Apr 18.

Comparison of a commercial qualitative real-time RT-PCR kit with direct immunofluorescence assay (DFA) and cell culture for detection of influenza A and B in children.

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  • 1Division of Microbiology, Department of Paediatric Laboratory Medicine, Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, M5G 1X8 Canada. farhad.gharabaghi@sickkids.ca

Abstract

BACKGROUND:

Institutional pandemic planning prompted a study of the molecular detection of influenza virus from respiratory specimens in children, compared to conventional diagnostics.

OBJECTIVE:

To evaluate the performance of a commercial qualitative real-time RT-PCR kit (rRT-PCR), the artus Influenza LC RT-PCR (Qiagen). STUDY DESIGN (METHODS): Specimens were pre-selected to include a high percentage of positives by direct immunofluorescence assay (DFA) or culture. The sensitivity and specificity of the kit for detection of influenza A and B in children were determined against the gold standard, DFA and culture. Specimens yielding discordant results between artus and the gold standard were tested against a reference rRT-PCR assay (Centers for Disease Control) to create an "expanded gold standard".

RESULTS:

When compared to DFA or cell culture, the sensitivity of the rRT-PCR artus kit was 96.2% and the specificity was 94%. It detected influenza RNA in 6.0% of clinical samples negative by DFA or culture. Using the expanded gold standard, the revised sensitivity was 98.7% (98.6% for influenza A and 97.6% for influenza B) and the specificity was 100%.

CONCLUSION:

The artus Influenza LC RT-PCR kit is an effective alternative to virus isolation and DFA for the detection of influenza A and B in pediatric clinical specimens.

PMID:
18374630
[PubMed - indexed for MEDLINE]
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