SARS-CoV-2 Ag:PrThr:Pt:Nasopharynx:Ord:IF
sars-cov-2 ag:prthr:pt:nasopharynx:ord:if
SARS-CoV-2 Antigen:Presence or Threshold:To identify measures at a point in time:Nasopharynx:Ordinal:Immune Fluorescence
sars-cov-2 antigen:presence or threshold:to identify measures at a point in time:nasopharynx:ordinal:immune fluorescence