B variant subtype Ab:PrThr:Pt:Ser/Plas^Donor:Ord
b variant subtype ab:prthr:pt:ser/plas^donor:ord
B variant subtype Antibody:Presence or Threshold:To identify measures at a point in time:Serum/Plasma^Donor:Ordinal
b variant subtype antibody:presence or threshold:to identify measures at a point in time:serum/plasma^donor:ordinal