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Table. 1.

Table. 1.

Percentage of correct identification through direct identification by MALDI-TOF MS depending on the type of blood culture bottle

Definitive identification N (%) organisms correctly detected by
BACTEC Plus bottle BacT/Alert bottle
Modified protocol SepsiPrep kit P Modified protocol SepsiPrep kit P
Gram-positive
Bacillus sp. 1/1 (100) 0/1 (0) Not available Not available
Corynebacterium spp. 2/3 (66.7) 2/3 (66.7) Not available Not available
Enterococcus spp. 12/13 (92.3) 10/13 (76.9) 10/11 (90.9) 5/11 (45.5)
Staphylococcus spp. 11/11 (100) 9/11 (81.8) 5/5 (100) 5/5 (100)
Streptococcus spp. 3/3 (100) 3/3 (100) 1/3 (33.3) 1/3 (33.3)
Total gram-positive 29/31 (93.5) 24/31 (77.4) 0.074 16/19 (84.2) 11/19 (57.9) 0.074
Gram-negative
Acinetobacter spp. 1/1 (100) 0/1 (0) 0/2 (0) 1/2 (50.0)
Bacteroides spp. Not available Not available 1/2 (50.0) 0/2 (0)
Escherichia sp. 10/10 (100) 9/10 (90.0) 17/18 (94.4) 13/18 (72.2)
Klebsiella spp. 6/6 (100) 6/6 (100) 11/12 (91.7) 7/12 (58.3)
Pseudomonas sp. 2/2 (100) 2/2 (100) 1/1 (100) 1/1 (100)
Roseomonas sp. 0/1 (0) 1/1 (100) Not available Not available
Salmonella sp. 1/1 (100) 1/1 (100) Not available Not available
Serratia sp. Not available Not available 1/1 (100) 0/1 (0)
Stenotrophomonas sp. 2/2 (100) 2/2 (100) Not available Not available
Total gram-negative 22/23 (95.7) 21/23 (91.3) 1.000 31/36 (86.1) 22/36 (61.1) 0.016
Total 51/54 (94.4) 45/54 (83.3) 0.078 47/55 (89.1) 33/55 (60.0) 0.001

Abbreviation: MALDI-TOF MS, matrix-assisted laser desorption ionization time-of-flight mass spectrometry.

Ann Lab Med 2024;44:183~187 https://doi.org/10.3343/alm.2023.0294

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