Identification of staphylococci by Phoenix: validation of a new protocol and comparison with Vitek 2 |
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Authors: | Chatzigeorgiou Kalliopi-Stavroula Siafakas Nikolaos Petinaki Efthymia Argyropoulou Athina Tarpatzi Aikaterini Bobola Maria Paniara Olga Velegraki Aristea Zerva Loukia |
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Affiliation: | Laboratory of Clinical Microbiology, Attikon Hospital, National and Kapodistrian University of Athens, Haidari, Athens, Greece. |
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Abstract: | Because of their frequent isolation in the routine laboratory and their increasing clinical significance, fast and accurate species identification of staphylococci may be required; this can only be achieved by automated systems. A total of 147 clinical isolates (52 Staphylococcus aureus, 50 Staphylococcus epidermidis, and 45 other coagulase-negative staphylococci CoNS]) were first identified by molecular methodology and then comparatively tested by Vitek 2 (new colorimetric identification card) and Phoenix using the novel 0.25 McFarland and the standard 0.50 McFarland inoculum protocols. All S. aureus isolates were accurately identified. Vitek 2 identified correctly all S. epidermidis and 93.3% of the other CoNS, whereas the respective rates were 86% and 82.2% for Phoenix's standard and 92% and 82.2% for the novel protocol. It appears that both systems provide excellent identification of S. aureus, but Vitek 2 recognizes CoNS species more accurately than Phoenix. The 0.25 McFarland protocol does not improve system performance. |
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Keywords: | Staphylococcus Vitek 2 Phoenix Identification |
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