VAP	Ventilator-associated pneumonia
VOC	Volatile organic compound
BAL	Bronchoalveolar lavage
GC-MS	Gas chromatography–mass spectrometry
ECDC	European Centre for Disease Control and Prevention
AST	Antimicrobial susceptibility test
ICU	Intensive care unit
CFU	Colony-forming unit
TSB	Tryptic soy broth
DMS	Dimethyl sulfide
DMDS	Dimethyl disulfide
VSC	Volatile sulfuric compound
Susc./S	Susceptible
Res./R	Resistant
IMI	Imipenem
PBS	Phosphate-buffered saline
HC	Hydrocarbon
Alc.	Alcohol
Ald.	Aldehyde
Ket.	Ketone
MCC-IMS	Multi-capillary column-ion mobility spectrometry
GC-IMS	Gas chromatography–ion mobility spectrometry
PTR-MS	Proton transfer reaction–mass spectrometry
SIFT-MS	Selected-ion flow-tube mass spectrometry
FDR	False discovery rate
VIM	Verona-integron encoded beta-lactamase enzyme