Abbreviations
N-protein IgG: nucleocapsid (N) IgG protein
NH: Nursing home
RT-PCR: real-time reverse-transcriptase polymerase chain reaction for
SARS-CoV-2
S-protein IgG: SARS-CoV-2 spike IgG
SARS-CoV-2: Severe Acute Respiratory Syndrome Coronavirus-2