The enzyme linked immunosorbent assay using the so-called "double-sandwich technique" has been applied to determine botulinum toxin type A. By this assay, 50-100 mouse ip LD50 of toxin type A can be detected. No cross-reaction occurs with botulinum toxins of other types tested. In all probability this is due to the high specificity of the antiserum prepared against the toxic component of type A toxin.
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NOTERMANS et al. (1978) studied this question.
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