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Journal of Clinical Microbiology, Aug 1997, 2076-2082, Vol 35, No. 8
JS Ellis, DM Fleming and MC Zambon
Multiple-target (multiplex) reverse transcription-PCR (RT-PCR) for
detection, typing, and subtyping of the hemagglutinin gene of influenza
type A (H3N2 and H1N1) and type B viruses was developed and applied
prospectively to virological surveillance of influenza in England in the
1995-1996 winter season. During this season both influenza A H3N2 and H1N1
viruses were circulating, although at different times. Six hundred nineteen
combined nose and throat swabs taken by general practitioners in sentinel
practices from individuals presenting with "influenzalike illness" were
analyzed by culture, multiplex RT-PCR, and immunofluorescence. Of the 619
samples, 246 (39.7%) were positive by multiplex RT-PCR compared with 200
(32.3%) which yielded influenza viruses on culture. There was 100%
correlation between multiplex RT-PCR typing and subtyping and the influenza
types and subtypes obtained from culture. There was also excellent
correlation between the temporal detection of influenza A H3N2 and H1N1
viruses by multiplex RT-PCR and by culture. During the peak weeks of
influenza virus activity, a total of 259 specimens were received, of which
101 (38.9%) yielded influenza viruses on culture while 149 (57.5%) were
positive in multiplex RT-PCR, providing an increase in detection of
influenza viruses of approximately 20%. The increased detection of
influenza virus occurred in all the age groups sampled. Samples which were
positive by multiplex RT-PCR but negative by culture were not detected
significantly earlier or later in the winter of 1995-1996 but were detected
during the peak weeks of clinical influenza virus activity. Multiplex
RT-PCR was successfully used in surveillance of influenza to provide
accurate, sensitive diagnosis directly on clinical specimens sent through
the post.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Multiplex reverse transcription-PCR for surveillance of influenza A and B viruses in England and Wales in 1995 and 1996
Enteric and Respiratory Virus Laboratory, Central Public Health Laboratory, Colindale, London, United Kingdom.
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