West Nile virus Ag:PrThr:Pt:Bld/Bone mar^Donor:Ord
west nile virus ag:prthr:pt:bld/bone mar^donor:ord
West Nile virus Antigen:Presence or Threshold:To identify measures at a point in time:Whole blood/Marrow (bone)^Donor:Ordinal
west nile virus antigen:presence or threshold:to identify measures at a point in time:whole blood/marrow (bone)^donor:ordinal