Table 3.
Performance of MALDI-TOF/Sepsityper for identification of microorganisms from polymicrobial blood culture bottles
| Organism(s) (identified by routine methods) | MALDI identification | Scoreb | Gram staina |
|---|---|---|---|
| E. coli, CoNS | E. coli | 2.43 | GNR, GPCCL |
| S. pyogenes, CoNS, viridans group Streptococcus | S. pyogenes | 2.19 | GPCCH |
| Candida albicans, Candida glabrata, CoNS | Unable to identify | NA | YST |
| Enterococcus faecalis, CoNS | E. faecalis | 2.35 | GPCCH |
| Klebsiella pneumoniae, Flavobacterium indologenes, Candida tropicalis | K. pneumoniae | 2.36 | GNR |
| C. glabrata, Lactobacillus spp. | Aromatoleum spp. | 1.29 | YST, GPCCH |
| E. coli, Citrobacter amalonaticus | E. coli | 2.36 | GNR |
| Eubacterium lentum, Peptostreptococcus asaccharolyticus | Mixed Pseudomonas spp. | <1.4 | GNR, GPC |
| Citrobacter freundii, Streptococcus salivarius | C. freundii | 2.47 | GNR, GPCCH |
| Bacillus spp. CoNS | Unable to identify | NA | GNR, GPCCH |
| Klebsiella oxytoca, Enterococcus faecium, E. coli | E. coli | 2.41 | GNR |
| S. aureus, Streptococcus agalactiae | S. agalactiae | 2.43 | GPCCH |
| Acinetobacter spp., CoNS 1, CoNS 2 | S. hominis | 2.14 | GNR,GPCCL |
| B. fragilis, Bacteriodes vulgatus, Clostridium clostridioforme | Unable to identify | NA | GNR |
a
Primary Gram stain result. GNR, Gram-negative rod; GPCCL, Gram-positive cocci in clusters; GPCCH, Gram-positive cocci in chains; YST, yeast.
b
NA, not applicable.