Table 1. Valid Vitek® MS results of 1,181 bacterial and yeast isolates.
| Fine identification | No. of isolates | No. [%] of isolates with the indicated resulta | ||||
|---|---|---|---|---|---|---|
| Correct identification to the level of: | No identification | Misidentification | ||||
| Species | Genus | Above genus | ||||
| Enterobacteriaceae | 560 | 522 [93.2] | 38 [6.8] | |||
| Citrobacter amalonaticus | 1 | 1 [100] | ||||
| Citrobacter freundii | 3 | 3 [100] | ||||
| Citrobacter koseri | 2 | 2 [100] | ||||
| Enterobacter aerogenes | 5 | 5 [100] | ||||
| Enterobacter cloacaee | 36 | 36 [100] | ||||
| Escherichia coli | 224 | 224 [100] | ||||
| Klebsiella oxytoca | 7 | 7 [100] | ||||
| Klebsiella pneumoniae | 178 | 178 [100] | ||||
| Morganella morganii | 22 | 22 [100] | ||||
| Pantoea agglomerans | 1 | 1 [100] | ||||
| Proteus mirabilis | 6 | 6 [100] | ||||
| Proteus vulgaris | 1 | 1 [100] | ||||
| Salmonella typhi g | 1 | 1 [100] | ||||
| Serratia marcescens | 73 | 73 [100] | ||||
| Nonfermentative Gram-negative rods | 311 | 307 [98.7] | 1 [0.3] | 2 [0.6] | 1 [0.3] | |
| Acinetobacter baumannii complexg | 247 | 247 [100] | ||||
| Acinetobacter bouvetii | 1 | 1b [100] | ||||
| Acinetobacter johnsonii | 1 | 1 [100) | ||||
| Acinetobacter junii | 1 | 1 [100] | ||||
| Burkholderia cepacia | 12 | 12 [100] | ||||
| Burkholderia pickettii | 1 | 1 [100] | ||||
| Moraxella catarrhalis | 1 | 1 [100] | ||||
| Moraxella osloensis | 1 | 1c [100] | ||||
| Pseudomonas aeruginosa | 35 | 35 [100] | ||||
| Pseudomonas putida | 6 | 6 [100] | ||||
| Pseudomonas fluorescens | 4 | 4 [100] | ||||
| Pseudoxanthomonas mexicana | 1 | 1 [100] | ||||
| Gram-positive cocci | 130 | 127 [97.7] | 1 [0.8] | 2 [1.5] | ||
| Staphylococcus aureus | 27 | 27 [100] | ||||
| Staphylococcus epidermidis | 26 | 26 [100] | ||||
| Staphylococcus haemolyticus | 9 | 9 [100] | ||||
| Staphylococcus hominis | 7 | 7 [100] | ||||
| Staphylococcus saprophyticus | 2 | 2 [100] | ||||
| Staphylococcus pasteuric | 2 | 2 [100] | ||||
| Enterococcus avium | 3 | 3 [100] | ||||
| Enterococcus casseliflavus | 1 | 1 [100] | ||||
| Enterococcus faecalis | 19 | 19 [100] | ||||
| Enterococcus faecium | 18 | 18 [100] | ||||
| Enterococcus gallinarum | 2 | 2 [100] | ||||
| Enterococcus raffinosus | 1 | 1d [100] | ||||
| Streptococcus agalactiae | 3 | 3 [100] | ||||
| Streptococcus dysgalactiae | 2 | 2 [100] | ||||
| Streptococcus anginosus | 4 | 4 [100] | ||||
| Streptococcus constellatus | 3 | 3 [100] | ||||
| Streptococcus pneumoniae | 1 | 1 [100] | ||||
| Anaerobes | 12 | 12 [100] | ||||
| Bacteroides fragilis | 2 | 2 [100] | ||||
| Bacteroides thetaiotaomicron | 1 | 1 [100] | ||||
| Bacteroides ovatus | 1 | 1 [100] | ||||
| Clostridium difficile | 1 | 1 [100] | ||||
| Eggerthella lenta | 1 | 1 [100] | ||||
| Fusobacterium varium | 1 | 1 [100] | ||||
| Parabacteroides distasonis | 1 | 1 [100] | ||||
| Peptostreptococcus anaerobius | 1 | 1 [100] | ||||
| Propionibacterium acnes | 1 | 1 [100] | ||||
| Prevotella intermedia | 1 | 1 [100] | ||||
| Prevotella bivia | 1 | 1 [100] | ||||
| Miscellaneous bacteria | 48 | 45 [93.8] | 3 [6.3] | |||
| Aeromonas hydrophila f | 2 | 2 [100] | ||||
| Aeromonas caviae f | 1 | 1 [100] | ||||
| Brucella melitensis | 1 | 1 [100] | ||||
| Cardiobacterium hominis | 2 | 2 [100] | ||||
| Gardneralla vaginalis | 2 | 2 [100] | ||||
| Haemophilus influenzae | 20 | 20 [100] | ||||
| Haemophilus parahaemolyticus | 1 | 1 [100] | ||||
| Haemophilus parainfluenzae | 9 | 9 [100] | ||||
| Listeria monocytogenes | 2 | 2 [100] | ||||
| Neisseria gonorrhoeae | 2 | 2 [100] | ||||
| Pasteurella multocida | 1 | 1 [100] | ||||
| Vibrio parahaemolyticus | 2 | 2 [100] | ||||
| Vibrio vulnificus | 3 | 3 [100] | ||||
| Yeast | 120 | 117 [97.5] | 2 [1.7] | 1 [0.8] | ||
| Candida albicans | 6 | 6 [100] | ||||
| Candida butyri | 2 | 2 [100] | ||||
| Candida glabrata | 19 | 19 [100] | ||||
| Candida guilliermondii | 7 | 7 [100] | ||||
| Candida haemulonii | 10 | 10 [100] | ||||
| Candida lusitaniae | 1 | 1 [100] | ||||
| Candida parapsilosis | 20 | 20 [100] | ||||
| Candida pelliculosa | 14 | 14 [100] | ||||
| Candida tropicalis | 33 | 33 [100] | ||||
| Cryptococcus neoformans | 3 | 3 [100] | ||||
| Rhodosporidium fluviale | 1 | 1 [100] | ||||
| Saccharomyces cerevisiae | 1 | 1 [100] | ||||
| Trichosporon asahii | 3 | 3 [100] | ||||
| Total | 1,181 | 1,130 [95.7] | 42 [3.6] | 3 [0.3] | 5 [0.4] | 1 [0.1] |
a, Species, correct identification at the species level (single choice or low discrimination at the subspecies level); genus, correct identification at the genus level (low discrimination at the species level); above genus, correct identification proposed among a set of low-discrimination results including species of different genera; b, The 1st identified as Acinetobacter johnsonii (confidence value 99.9%) by the Vitek® MS system, 2nd identified as Acinetobacter bouvetii (confidence value 99.9%), 3rd identified as Acinetobacter bouvetii (confidence value 99.9%); c, The 1st identified as Moraxella osloensis (confidence value 99.9%) by the Vitek® MS system, 2nd identified as Alcaligenes faecalis (confidence value 99.9%), 3rd identified as Moraxella osloensis (confidence value 98.9%); d, The 1st identified as Enterococcus raffinosus (confidence value 96.9%) by the Vitek® MS system, 2nd identified as Enterococcus avium (confidence value 99.9%), 3rd identified as Enterococcus raffinosus (confidence value 99.9%); e, The Enterobacter cloacae/asburiae species group is displayed as a species group result by the Vitek® MS; f, The Aeromonas hydrophila/caviae species group is displayed as a species group result by the Vitek® MS; g, The species group is the final Vitek® MS identification. The subspecies or species included in each species group are as follows: for the Salmonella group, S. enterica subsp. enterica, S. enterica serovar Enteritidis, S. enterica serovar Paratyphi B, S. enterica serovar Paratyphi C, S. enterica serovar Typhimurium, and Salmonella spp.; for the Acinetobacter baumannii complex, A. baumannii, A. calcoaceticus, Acinetobacter genomospecies 3, and Acinetobacter genoh-3ospecies TU13.