COVID-19	coronavirus disease 2019
SARS-CoV-2	severe acute respiratory syndrome virus 2
HCWs	healthcare workers
PPE	personal protective equipment
RT-PCR	reverse-transcriptase polymerase chain reaction
FIA	fluorescent immunoassay
ELISA	enzyme-linked immunosorbent assay
IRB	institutional review board
COI	cut-off index
RBD	receptor-binding domain
OD	optical density
CT	computed tomography
MFDS	Ministry of Food and Drug Safety
CDC	Center for Disease Control and Prevention