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Journal of Clinical Microbiology, January 2002, p. 247-251, Vol. 40, No. 1
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.1.247-251.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Rapid Identification of Staphylococcus aureus Directly from Blood Cultures by Fluorescence In Situ Hybridization with Peptide Nucleic Acid Probes

Kenneth Oliveira,1 Gary W. Procop,2 Deborah Wilson,2 James Coull,1 and Henrik Stender1*

Boston Probes, Inc., Bedford, Massachusetts,1 Section of Clinical Microbiology, Cleveland Clinic Foundation, Cleveland, Ohio2

Received 16 July 2001/ Returned for modification 14 September 2001/ Accepted 7 October 2001

A new fluorescence in situ hybridization (FISH) method with peptide nucleic acid (PNA) probes for identification of Staphylococcus aureus directly from positive blood culture bottles that contain gram-positive cocci in clusters (GPCC) is described. The test (the S. aureus PNA FISH assay) is based on a fluorescein-labeled PNA probe that targets a species-specific sequence of the 16S rRNA of S. aureus. Evaluations with 17 reference strains and 48 clinical isolates, including methicillin-resistant and methicillin-susceptible S. aureus species, coagulase-negative Staphylococcus species, and other clinically relevant and phylogenetically related bacteria and yeast species, showed that the assay had 100% sensitivity and 96% specificity. Clinical trials with 87 blood cultures positive for GPCC correctly identified 36 of 37 (97%) of the S. aureus-positive cultures identified by standard microbiological methods. The positive and negative predictive values were 100 and 98%, respectively. It is concluded that this rapid method (2.5 h) for identification of S. aureus directly from blood culture bottles that contain GPCC offers important information for optimal antibiotic therapy.


* Corresponding author. Mailing address: Boston Probes, Inc., Bedford, MA 01730. Phone: (781) 271-1100. Fax: (781) 276-4931. E-mail: HStender{at}BostonProbes.com.


Journal of Clinical Microbiology, January 2002, p. 247-251, Vol. 40, No. 1
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.1.247-251.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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