the pas-elisa method was more sensitive than the direct double antibody sandwich form of elisa ( das-elisa ) , e.g . not only were a405 values for homologous reactions greater in pas-elisa but also an antiserum to a birch isolate of cherry leaf roll virus detected four related isolates with the new method against only one with das-elisa .
C0020960
antiserum
C0003241
das-elisa