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Journal of Clinical Microbiology, February 2000, p. 781-788, Vol. 38, No. 2
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Rapid Diagnosis of Bacteremia by Universal Amplification of 23S Ribosomal DNA Followed by Hybridization to an Oligonucleotide Array

R. M. Anthony, T. J. Brown, and G. L. French*

Department of Microbiology, King's College St. Thomas' Campus, St. Thomas' Hospital, London SE1 7EH, United Kingdom

Received 10 May 1999/Returned for modification 8 September 1999/Accepted 29 October 1999

The rapid identification of bacteria in blood cultures and other clinical specimens is important for patient management and antimicrobial therapy. We describe a rapid (<4 h) detection and identification system that uses universal PCR primers to amplify a variable region of bacterial 23S ribosomal DNA, followed by reverse hybridization of the products to a panel of oligonucleotides. This procedure was successful in discriminating a range of bacteria in pure cultures. When this procedure was applied directly to 158 unselected positive blood culture broths on the day when growth was detected, 125 (79.7%) were correctly identified, including 4 with mixed cultures. Nine (7.2%) yielded bacteria for which no oligonucleotide targets were present in the oligonucleotide panel, and 16 culture-positive broths (10.3%) produced no PCR product. In seven of the remaining eight broths, streptococci were identified but not subsequently grown, and one isolate of Staphylococcus aureus was misidentified as a coagulase-negative staphylococcus. The accuracy, range, and discriminatory power of the assay can be continually extended by adding further oligonucleotides to the panel without significantly increasing complexity or cost.


* Corresponding author. Mailing address: Department of Microbiology, King's College St. Thomas' Campus, St. Thomas' Hospital, London SE1 7EH, United Kingdom. Phone: 44 (0) 171 922 8385. Fax: 44 (0) 171 928 0730. E-mail: gary.french{at}kcl.ac.uk.


Journal of Clinical Microbiology, February 2000, p. 781-788, Vol. 38, No. 2
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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Copyright © 2000 by the American Society for Microbiology. All rights reserved.