In an assay procedure, purified Clostridium perfringens enterotoxin induced the accumulation of fluid in the ileal loop of the axenic pig. The smallest amount of enterotoxin causing a positive response was 25 micrograms (1:32 titer by counterimmunoelectrophoresis [CIEP] ), and 100 micrograms (1:128 CIEP titer) caused a marked response. Possibly, diarrhea in pigs with 1:32 CIEP titer or more of enterotoxin in the feces may be associated with enterotoxigenic C perfringens.
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Popoff et al. (1985) studied this question.