5-HT	5-hydroxytryptamine
5-HTP	5-hydroxytryptophan
ACE2	Angiotensin-converting enzyme 2
Ang	Angiotensin
C-Trp	C-glycosyltrytophan
CT	Computed tomography
EGF	Epidermal growth factor
FEV1	Forced expiratory volume
FGF	Fibroblast growth factor
FMT	Fecal microbiota transplantation
FOXP3	Forkhead box P3
FVC	Forced vital capacity
HDAC	Histone deacetylase
HSP	Heat-shock protein
IAA	Indole-3-acetic acid
ILA	Indole-3-lactic acid
IFN	Interferon
IDO	Indoleamine 2,3-dioxygenase
IPA	Indole-3-propionate
LBP	Lipopolysaccharide binding protein
LPS	Lipopolysaccharide
MAIT	Mucosal-associated invariant T
MDC	Macrophage-derived chemokine
ME/CFS	Myalgic encephalomyelitis/chronic fatigue syndrome
MIP-1b	Macrophage inflammatory protein-1 beta
MPIF-1	Myeloid progenitor inhibitory factor 1
NF-κB	Nuclear factor kappa-light-chain-enhancer of activated B cells
NLRP3	NOD-, LRR-, and pyrin domain-containing protein 3
PASC	Post-acute sequelae of COVID-19
RAAS	Renin–angiotensin–aldosterone system
ROS	Reactive oxygen species
SCFA	Short-chain fatty acid
Th17	T helper 17 cells
TLR	Toll-like receptor
TNF	Tumor necrosis factor
Treg	Regulatory T cell