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Table 2 Microorganism distribution

From: Impact of matrix-assisted laser desorption/ionization time of flight mass spectrometric evaluation on the clinical outcomes of patients with bacteremia and fungemia in clinical settings lacking an antimicrobial stewardship program: a pre-post quasi experimental study

Microorganism Conventional period Number (%) MALDI-TOF period Number (%) P Value†
Polymicrobial BSI 36/302 (11.9) 26/254 (10.2) 0.530
Total number of organisms 338 285  
Gram-positive bacteria 112 (33.1) 92 (32.3) 0.821
Staphylococcus aureus 29 (8.6) 20 (7.0) 0.470
 MRSA 16 (4.7) 12 (4.2) 0.754
 Coagulase-negative staphylococcus 26 (7.7) 14 (4.9) 0.158
Streptococcus spp 16 (4.7) 23 (8.1) 0.087
Enterococcus spp 32 (9.5) 24 (8.4) 0.649
 Other gram-positive bacteria 9 (2.7) 11 (3.9) 0.398
Gram-negative bacteria 208 (61.5) 172 (60.4) 0.762
Escherichia coli 94 (27.8) 81 (28.4) 0.866
Klebsiella spp 45 (13.3) 40 (14.0) 0.794
Acinetobacter spp 16 (4.7) 9 (3.2) 0.318
Enterobacter spp 12 (3.6) 5 (1.8) 0.170
Pseudomonas aeruginosa 6 (1.8) 6 (2.1) 0.765
Citrobacter spp 3 (0.9) 8 (2.8) 0.070
Serratia spp 3 (0.9) 3 (1.1) > 0.999
Proteus spp 4 (1.2) 4 (1.4) > 0.999
 Other gram-negative bacteria 25 (7.4) 16 (5.6) 0.371
Yeast 18 (5.3) 21 (7.4) 0.294
 Candida spp 17 (5.0) 21 (7.4) 0.224
Cryptococcus spp 1 (0.3) 0 (0.0) > 0.999
  1. *Abbreviations: MALDI-TOF matrix-assisted laser desorption/ionization time-of-flight, BSI bloodstream infection, MRSA methicillin resistant Staphylococcus aureus
  2. P-values were calculated using the chi-square or Fisher’s exact test