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Journal of Clinical Microbiology, May 1995, 1180-1184, Vol 33, No. 5
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Typing and subtyping of influenza viruses in clinical samples by PCR

KE Wright, GA Wilson, D Novosad, C Dimock, D Tan and JM Weber
Department of Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ontario, Canada.

Type A and B influenza viruses can cause a wide spectrum of illness, and these viruses are responsible for considerable mortality and morbidity. Rapid typing of isolates is desirable when amantadine treatment or prophylaxis of contacts of type A influenza virus carriers is considered, but the available rapid techniques lack sensitivity and standard diagnostic methods require expansion of virus in tissue culture or embryonated hens' eggs. We developed a series of oligonucleotide primers able to detect, type, and subtype type A influenza viruses in a single reverse transcription-PCR. RNA was isolated from clinical specimens, and cDNA was generated with random primers. PCR was carried out with a mixture of primers specific for influenza viruses of types B, A/H1 and A/H3, and subtyping of the neuraminidase was carried out on the same cDNA template under identical conditions. Amplified products were detected by ethidium bromide staining of amplified products after agarose gel electrophoresis. When it was used to test 98 clinical specimens, this method was comparable to standard culture techniques in the detection, typing, and subtyping of influenza viruses.

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