ACE2	angiotensin converting enzyme 2
APCs	antigen-presenting cells
BCR	B cell receptor
BALF	bronchoalveolar lavage fluid
COVID-19	coronavirus disease 19
CTLA-4	cytotoxic T lymphocyte associated antigen-4
FoxP3	Forkhead box P3
LAG-3	lymphocyte activation gene 3
MHC	major histocompatibility complex
MHC II	major histocompatibility complex class II
mAbs	monoclonal antibodies
nAbs	neutralizing antibodies
pTregs	peripheral Tregs
PD-L1	programmed death -ligand 1
SARS-CoV-2	severe acute respiratory syndrome coronavirus 2
Tregs	T regulatory cells
tTregs	thymic Tregs
TGF-beta	transforming growth factor-beta 1
TLRs	Toll like receptors
Th1	T helper 1
Th2	T helper 2
Th17	T helper 17
TCR	T cell receptor