ASVs	Amplicon Sequence Variants
DNA	Deoxyribonucleic acid
EDA	2-Dehydro-3-deoxyphosphogluconate aldolase
ED	Entner–Doudoroff
FF	Firefighter
FtsK	Filament temperature-sensitive mutant K
GAD-2	Generalized Anxiety Disorder-2
G3P	Glyceraldehyde 3-phosphate
Kos	KEGG orthologs
NIAAA	National Institute on Alcohol Abuse and Alcoholism
Non-FF	Non-firefighter
PCL-C	PTSD Checklist—Civilian Version
PCR	Polymerase chain reaction
PHQ-2	Patient Health Questionnaire-2
PSS	Perceived Stress Scale
PTSD	Post-Traumatic Stress Disorder
SCFAs	Short-chain fatty acids
Srt-A	Sortase A