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The development of a solid-phase microtiter radioimmunoassay blocking test to detect serum antibody to Escherichia coli heat-labile enterotoxin is described. The assay is easy to perform and quantitate, and it is sensitive and specific.

Solid-Phase Microtiter Radioimmunoassay Blocking Test for Detection of Antibodies to Escherichia coli Heat-Labile Enterotoxin