Influenza virus A Ab^2nd specimen:PrThr:Pt:Ser:Ord
influenza virus a ab^2nd specimen:prthr:pt:ser:ord
Influenza virus A Antibody^2nd specimen:Presence or Threshold:To identify measures at a point in time:Serum:Ordinal
influenza virus a antibody^2nd specimen:presence or threshold:to identify measures at a point in time:serum:ordinal