TABLE 1.
Results of direct inoculation of Vitek 2 ID-GNB card from blood cultures containing monomicrobial gram-negative rods
| Organism group and namea | No. of strains
|
||||
|---|---|---|---|---|---|
| Tested | Correctly identified | Low discrimination | Not identifiedb | Misidentified (misidentification)d | |
| Nonfermentersc | |||||
| Acinetobacter spp. | 4 | 1 | 3 (VNGNB) | ||
| Alcaligenes spp. | 3 | 1 | 2 (VNGNB) | ||
| Brevundimonas spp. | 1 | 1 | |||
| Flavimonas spp. | 1 | 1 | |||
| Ochrobactrum spp. | 1 | 1 | |||
| Pseudomonas stutzeri | 1 | 1 (VNGNB) | |||
| Ralstonia pickettii | 1 | 1 (VNGNB) | |||
| Stenotrophomonas maltophilia | 3 | 1 | 1 | 1 | |
| Anaerobic gram-negative rods | |||||
| Bacteroides spp. | 14 | 14 | |||
| Fusobacterium spp. | 2 | 2 (VNGNB) | |||
| Fastidious gram-negative rods | |||||
| Haemophilus influenzae | 6 | 2 | 4 | ||
| Streptobacillus moniliformis | 1 | 1 (VNGNB) | |||
| Gram-positive rods | |||||
| Clostridium spp. | 1 | 1 | |||
| Enterobacteriaceae | |||||
| Citrobacter koseri | 1 | 1 | |||
| Citrobacter freundii | 3 | 2 | 1 | ||
| Enterobacter aerogenes | 2 | 2 | |||
| Enterobacter cloacae | 21 | 20 | 1 | ||
| Enterobacter sakazakii | 1 | 1 (Enterobacter cloacae) | |||
| Escherichia coli | 188 | 183 | 3 | 1 (VNGNB), 1 (Klebsiella oxytoca) | |
| Ewingella americana | 1 | 1 | |||
| Klebsiella oxytoca | 13 | 13 | |||
| Klebsiella pneumoniae | 30 | 26 | 1 | 3 | |
| Leclercia adecarboxylata | 1 | 1 | |||
| Morganella morganii | 4 | 3 | 1 (Bergeyella zoohelcum) | ||
| Pantoea spp. | 3 | 1 | 1 | 1 | |
| Proteus mirabilis | 25 | 25 | |||
| Salmonella spp. | 7 | 6 | 1 | ||
| Serratia marcescens | 11 | 11 | |||
| Pseudomonas aeruginosa | 33 | 26 | 3 | 1 | 3 (VNGNB) |
| Total | 383 | 321 | 16 | 29 | 17 |
a
Names determined by Vitek 2 standard method or API system.
b
Includes Vitek 2 reports “unidentified,” “inconclusive,” and “terminated.”
c
Other than Pseudomonas aeruginosa.
d
VNGNB, various nonfermenting gram-negative bacilli.