Summary. Antisera against Clostridium dzgicile toxin B were prepared in sheep and rabbit and were used in indirect and sandwich enzyme-linked immunosorbent assays (ELISA) for the detection of toxin B. Polyvinyl chloride and polystyrene microtitration plates were tested as solid phases for the assay. Both assays had a lower limit of detection for toxin B of 1 ng/ml. They were used to detect the presence of toxin B in 210 human faecal specimens and also in the culture supernatant fluids of C. dzficile strains isolated from the faecal samples. There was a close correlation between the results of sandwich ELISA and those of cytotoxicity tests and isolation of C. dzficile. Our sandwich ELISA method seems to be useful as a presumptive test for detection of C. dzficile toxin B.
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