Table 1 Identification of Gram-negative bacilli from monomicrobial positive blood cultures by MALDI-TOF (direct method)*
No. of isolates | |||||||
|---|---|---|---|---|---|---|---|
Species | Identification by use of direct method MALDI-TOF MS with score (S) of: | No. of unidentified isolates | Total (%) | ||||
S < 1.7 | 1.7 ≤ S < 2 | 2.0 ≥ S <2.3 | S ≥ 2.3 | Direct MALDI-TOF MS | Routine MALDI-TOF MS | ||
Klebsiella pneumoniae | 4 | 40 | 44 (37.3 %) | ||||
Escherichia coli | 23 | 23 (19.5 %) | |||||
Enterobacter aerogenes | 1 | 4 | 5 (4.3 %) | ||||
Enterobacter cloacae | 1 | 4 | 5 (4.3 %) | ||||
Enterobacter cancerogenus | 1 | 1 (0.8 %) | |||||
Klebsiella oxytoca | 3 | 3 (2.6 %) | |||||
Proteus mirabilis | 3 | 3 (2.6 %) | |||||
Serratia marcescens | 1 | 1 | 2 (1.7 %) | ||||
Citrobacter freundii | 1 | 1 (0.8 %) | |||||
Pseudomonas aeruginosa | 3 | 1 | 9 | 13 (11 %) | |||
Acinetobacter baumannii | 10 | 2 | 12 (10.2 %) | ||||
Acinetobacter lwoffii | 1 | 1 | 2 (1.7 %) | ||||
Pseudomonas stutzeri | 1 | 1 (0.8 %) | |||||
Stenotrophomonas maltophilia | 1 | 1 | 1 (0.8 %) | ||||
Bacteroides fragilis | 1 | 1 (0.8 %) | |||||
Fusobacterium nucleatum | 1 | 1 (0.8 %) | |||||
Total (%) | 1 (0.8 %) | 3 (2.5 %) | 20 (17 %) | 93 (78.9 %) | 1 (0.8 %) | 118 | |