In recent years, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has been used in making diagnoses, since this method can provide results quickly. MALDI-TOF MS can be obtained within minutes when starting from an individual colony, and or within only 30 min starting from a positive blood culture bottle [3]. The concordance rate for the identification of blood culture-positive samples between the conventional culture method and MALDI-TOF MS was good at 83.3%–96.6% for gram-negative bacilli, but it was only 31.8%–64.8% for gram-positive bacteria [3]. Although MALDI-TOF MS can be used to quickly identify bacterial species, the method cannot be used to concurrently obtain information on susceptibility to antimicrobials.