
Keywords: EDC; 1-ethyl-3-(3-dimethylpropyl)-carboiimide; DU; D-antigen unit; ELISA; enzyme-linked immunosorbent assay; EWS; European Working Standard; HBS-EP; hepes-buffered saline containing EDTA and the P20 detergent; Ig; immunoglobulin; IPV; inactivated polio va