Objective To develop and verify a double antibody sandwich ELISA diagnostic kit for F1 antigen of Yersinia pestis. Methods Antisera were prepared by immunizing rabbits with F1 antigen of Y. pestis, subjected to salting out with50% ammonium sulfate, the purified by Sephacryl S-300 gle column chromatography and used as the coating antibody.The murine ascites containing monoclonal antibody(McAb)against F1 antigen was prepared, purified, labled with HRP and used as the enzyme-labeled antibody. Three batches of ...