MP	Mycoplasma pneumoniae
CAP	Community-acquired pneumonia
MPP	Mycoplasma pneumoniae pneumonia
SMPP	Severe Mycoplasma pneumoniae pneumonia
PE	Pleural effusion
BO	Bronchiolitis obliterans
NK cells	Natural killer cells
COVID-19	Coronavirus disease 2019
CD4+	Cluster of differentiation 4
CD8+	Cluster of differentiation 8
FBS	Fetal bovine serum
PBS	Phosphate-buffered saline
FcR	Fc receptor
MACS	Magnetic-activated cell sorting
EDTA	Ethylenediaminetetraacetic acid
BSA	Bovine serum albumin
FSC	Forward scatter
SSC	Side scatter
PBMCs	Peripheral blood mononuclear cells
DCs	Dendritic cells
MDSCs	Myeloid-derived suppressor cells
HLA-DR	Human leukocyte antigen—DR isotype
CD	Cluster of differentiation
Th	T helper cell
Tfh	T follicular helper cell
Th9	T helper 9 cell
Th1	T helper 1 cell
Th2	T helper 2 cell
Th17	T helper 17 cell
Th22	T helper 22 cell
Teff	Effector T cell
Tem	Effector memory T cell
Tcm	Central memory T cell
GM-CSF	Granulocyte-macrophage colony-stimulating factor
IL-2	Interleukin-2
CCR	C-C chemokine receptor
CXCR	C-X-C chemokine receptor