Open AccessAnalysis of the Comparative Workflow and Performance Characteristics of the VITEK 2 and Phoenix Systems
Author(s) -
Ulrich Eigner,
Andreas Schmid,
U. Wild,
Daniela Bertsch,
Anne Marie Fahr
Publication year - 2005
Publication title -
journal of clinical microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.349
H-Index - 255
eISSN - 1070-633X
pISSN - 0095-1137
DOI - 10.1128/jcm.43.8.3829-3834.2005
Subject(s) - phoenix , enterococcus , microbiology and biotechnology , biology , veterinary medicine , medicine , metropolitan area , pathology , antibiotics
The VITEK 2 (bioMérieux, Marcy L′Ètoile, France) and the Phoenix systems (BD Diagnostic Systems, Sparks, Md.) are automated instruments for rapid organism identification and susceptibility testing. We evaluated the workflow, the time to result, and the performance of identification and susceptibility testing of both instruments. A total of 307 fresh clinical isolates were tested: 141Enterobacteriaceae , 22 nonfermenters, 93Staphylococcus spp., and 51Enterococcus spp. Manipulation time was measured in batches, each with seven isolates, for a total of 39 batches. The mean (± standard deviation [SD]) manipulation time per batch was 20.9 ± 1.8 min for Phoenix and 10.6 ± 1.0 min for VITEK 2 (P < 0.001). Mean (±SD) time to result for all bacterial groups was 727 ± 162 min for Phoenix and 506 ± 120 min for VITEK 2 (P < 0.001). Concerning identification, Phoenix and VITEK 2 yielded the same results for nonfermenters (100%), staphylococci (97%), and enterococci (100%). For 140Enterobacteriaceae strains evaluated, 135 (96%) were correctly identified by Phoenix and 137 (98%) by VITEK 2 (P = 0.72). The overall category agreement for all isolates was 97.0% for both instruments. The minor error rate, major error rate, and very major error rate for all bacterial isolates tested were 3.0, 0.3, and 0.6 and 2.8, 0.2, and 1.7 for Phoenix and VITEK 2, respectively (P values of 0.76, 0.75, and 0.09). The VITEK 2 system required less manual manipulation time and less time than the Phoenix system to yield results.