Abstract
Summary
Antibotulinal serums (types A and E) were prepared by immunizing rabbits with either toxin or toxoid obtained by formaldehyde treatment. Serial absorption of antitoxoid with toxoid removed the mouse protective activity completely. Similar absorption of antitoxin with toxoid left a high plateau of protective titer; this activity not precipitated by toxoid was removable with toxin. Botulinal toxoid differs sufficiently from toxin so that the two can be distinguished as immunizing or antiserum-absorbing antigens.
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