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A procedure, which we have termed DOT-ELISA, to detect Clostridium perfringens type A enterotoxin on nitrocellulose paper is described. Seventy eight preparations from 39 cultures of C. perfringens type A were tested simultaneously by this and by Plate-ELISA methods. The results were comparable. DOT-ELISA detected as little as 0.02 micrograms of purified enterotoxin and 0.13 micrograms of enterotoxin in cell-free culture supernatant. As little as 0.02 micrograms purified enterotoxin mixed with human faeces could be detected specifically. The method is simple and does not require an ELISA reader.
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