Abstract

Immunological similarities of heat-labile Escherichia coli enterotoxins pathogenic for man (LTh) and piglets (LTp) and cholera enterotoxin (CT) were examined quantitatively by the reversed Mancini test. The following results were obtained by analysis of rabbit antisera against these toxins. (1) 86% and 61% of the immunoglobulins in anti-CT antisera were antibodies cross-reacting with LTh and LTp, respectively; (2) 77% and 66% of the immunoglobulins in anti-LTh antisera were antibodies cross-reacting with LTp and CT, respectively; (3) 75% and 59% of the immunoglobulins in anti-LTp antisera were antibodies cross-reacting with LTh and CT, respectively.

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