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J Med Microbiol 58 (2009), 829-831; DOI: 10.1099/jmm.0.006106-0
© 2009 Society for General Microbiology
ISSN 0022-2615

Genotypic versus phenotypic methods in the detection of Listeria monocytogenes prosthetic joint infection

Barbora Zaloudíková1, Martin Kelbl2, Libor Pasa2 and Tomás Freiberger1,3

1 Molecular Genetics Laboratory, Centre for Cardiovascular Surgery and Transplantation, Brno, Czech Republic

2 Department of Traumatology, Faculty of Medicine, Masaryk University, Trauma Hospital of Brno, Brno, Czech Republic

3 Institute of Clinical Immunology and Allergology, Faculty of Medicine, Masaryk University, St Anne's University Hospital, Brno, Czech Republic

Correspondence
Tomás Freiberger
tomas.freiberger{at}cktch.cz

Received August 29, 2008
Accepted February 9, 2009

A rare case of a severe prosthetic joint infection in a 71-year-old immunocompetent woman is presented. Listeria monocytogenes was identified in two consecutive samples using broad-range PCR and sequencing, whereas cultivation remained negative for the first sample and streptococci of a non-group A streptococci, non-group B streptococci type were detected for the second one. This report demonstrates that the phenotypic approach may lead to misidentification of L. monocytogenes in a routine clinical setting. Molecular methods of pathogen detection might be useful when a rare and/or unexpected micro-organism is present or the sample is collected during antibiotic treatment.

Abbreviations: GAS, group A streptococci; GBS, group B streptococci; PJI, prosthetic joint infection.






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