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Table 3 Identification of Gram-positive cocci from monomicrobial positive blood cultures by MALDI-TOF (direct and SepsiTyper (ST) methods)*

From: Rapid and reliable identification of Gram-negative bacteria and Gram-positive cocci by deposition of bacteria harvested from blood cultures onto the MALDI-TOF plate

  No. of isolates
Species Identification by use of MALDI-TOF MS with score (S) of: No. of unidentified isolates No. of misdentified isolates Total (%)
S < 1.7 1.7 ≤ S < 2 2.0 ≥ S <2.3 S ≥ 2.3    
Direct ST Direct ST Direct ST Direct ST Direct ST Direct ST
S. aureus 1   3   2 4   1   1    6 (7.5 %)
S. epidermidis 14 11 16 20 3 3    3 1   1 36 (45 %)
S. capitis    1 1 5 5 1    1    7 (8.9 %)
S. haemolyticus 1   1 2 3 3   1 1 1 1   7 (8.9 %)
S. hominis 2    1 4 3   2      6 (7.5 %)
S. warneri 1   1 1         1 2 (2.5 %)
Staphylococcus xylosis    1 1          1 (1.2 %)
Staphylococcus simulans      1 1        1 (1.2 %)
Staphylococcus sciuri      1 1        1 (1.2 %)
Staphylococcus pettenkoferi    1 1          1 (1.2 %)
E. faecium     1 4 1   1   1 1 1 5 (6.3 %)
E. faecalis      1 1 1 1      2 (2.5 %)
Enterococcus casseliflavus    1    1        1 (1.2 %)
S. oralis group mitis            1 1 1 (1.2 %)
Streptococcus anginosus    1 1          1 (1.2 %)
M. luteus 1        1 1 1    2 (2.5 %)
Total (%) 20 (25 %) 11 (14 %) 26 (33 %) 29 (36 %) 24 (30 %) 23 (29 %) 2 (2 %) 7 (8 %) 5 (6 %) 6 (8 %) 3 (4 %) 4 (5 %) 80
  1. *Using the results obtained with the routine methods by MALDI-TOF and Vitek 2 as comparators