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