HCW	Healthcare workers
AIM	Activation-induced cell marker assay
MPs	Megapools
MPS	Megapools Spike
RT-PCR	Real-time reverse-transcriptase polymerase chain reaction
DMSO	Dimethyl sulfoxide
PBMC	Peripheral blood mononuclear cells
FCS	Fetal calf serum
DMSO	Dimethyl Sulfoxide
PHA	Phytohemagglutinin
mAbs	Monoclonal antibodies
APC	Allophycocianin
BV	Brilliant Violet
SI	Stimulation Index
RBD	Receptor binding domain
ECLIA	Electrochemiluminescence immunoassay
SD	Standard deviation