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. 2015 Sep 16;53(10):3349–3352. doi: 10.1128/JCM.01493-15

TABLE 1.

Rapid identification of bacteria in 400 blood cultures using smudge plate preparation and MALDI-TOF MS system

Organism No. of isolates No. with correct IDa (%)
No. with discordant ID No. with no ID
Species level Genus level Combined
Total 400 343 (85.8) 15 (3.7) 358 (89.5) 8 34
Gram-positive organisms 248 197 (79.4) 13 (5.2) 210 (84.7) 7 31
    Staphylococcus aureus 58 56 (96.6) 0 56 (96.6) 1 1
    CoNSb 95 76 (80.0) 0 76 (80.0) 2 17
    Enterococcus faecalis 18 18 (100) 0 18 (100) 0 0
    E. faecium 7 6 (85.7) 0 6 (85.7) 0 1
    Streptococcus pneumoniae 7 7 (100) 0 7 (100) 0 0
    S. viridans group 9 4 (44.4) 0 4 (44.4) 1 4
    S. anginosus group 7 3 (42.9) 0 3 (42.9) 1 3
    S. bovis group 3 3 (100) 0 3 (100) 0 0
    S. pyogenes 2 1 (50.0) 0 1 (50.0) 0 1
    S. agalactiae 5 5 (100) 0 5 (100) 0 0
    S. dysgalactiae 2 1 (50.0) 0 1 (50.0) 0 1
    S. suis 1 1 (100) 0 1 (100) 0 0
    Bacillus species 21 9 (42.9) 10 (47.6) 19 (90.5) 1 1
    Paenibacillus species 4 0 3 (75.0) 3 (75.0) 0 1
    Listeria monocytogenes 2 1 (50.0) 0 1 (50.0) 1 0
    Corynebacterium species 1 0 0 0 0 1
    Lactobacillus casei 1 1 (100) 0 1 (100) 0 0
    Dermabacter hominis 1 1 (100) 0 1 (100) 0 0
    Microbacterium flavescens 1 1 (100) 0 1 (100) 0 0
Gram-negative organisms 152 146 (96.1) 2 (1.3) 148 (97.4) 1 3
    Enterobacteriaceae 133 130 (97.7) 2 (1.5) 132 (99.2) 0 1
    Escherichia coli 78 78 (100) 0 78 (100) 0 0
    Klebsiella species 25 25 (100) 0 25 (100) 0 0
    Enterobacter species 10 10 (100) 0 10 (100) 0 0
    Proteus species 10 10 (100) 0 10 (100) 0 0
    Serratia marcescens 7 7 (100) 0 7 (100) 0 0
    Raoultella ornithinolytica 1 0 1 (100) 1 (100) 0 0
    Salmonella species (nontyphi) 1 0 1 (100) 1 (100) 0 0
    Pseudomonas aeruginosa 10 10 (100) 0 10 (100) 0 0
    Stenotrophomonas maltophilia 2 2 (100) 0 2 (100) 0 0
    Campylobacter jejuni 1 0 0 0 0 1
    Moraxella atlantae 1 0 0 0 0 0
    M. osloensis 1 1 (100) 0 1 (100) 0 1
    Brevundimonas vesicularis 1 0 0 0 0 1
    Sphingobacterium species 1 0 0 0 0 1
Anaerobic organisms
    Clostridium clostridioforme 1 1 (100) 0 1 (100) 0 0
    C. ramosum 1 1 (100) 0 1 (100) 0 0
    Propionibacterium acnes 1 1 (100) 0 1 (100) 0 0
    Bacteroides fragilis 2 2 (100) 0 2 (100) 0 0
    B. thetaiotaomicron 1 1 (100) 0 1 (100) 0 0
a

ID, identification.

b

CoNS, coagulase-negative Staphylococcus.