In this application note, Shimadzu Corporation introduces three analytical instruments to evaluate infectious diseases caused by harmful microorganisms: liquid chromatography-mass spectrometer (LC-MS), matrix assisted laser desorption/ionization time-of-flight mass spectrometer (MALDI-TOF MS), and gas chromatography-mass spectrometer (GC-MS). The note highlights the rise of bacterial infectious diseases in the past 10 years, emphasizing the importance of investigating and examining these infecti