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The ability of cell extracts and culture filtrates of various strains ofC. perfringens to produce ileal loop fluid accumulation and overt diarrhea in rabbits was tested. Good correlation was obtained in the ability of whole cells and a toxic factor (present in cell extracts and concentrated culture filtrates) to produce both fluid accumulation in ileal loops and diarrhea when injected into the normal ileum of the rabbit. The toxic factor was present in cell-free preparations when cells were grown in a sporulation medium, but not when they were grown in an asporogenic medium. The factor was shown to be heat labile, nondialyzable, and was inactivated by Pronase but not by trypsin, lipase, or amylase. Loss of activity occurred atp H 1.0, 3.0, 5.0, and 12.0.

Ileal Loop Fluid Accumulation and Production of Diarrhea in Rabbits by Cell-free Products of Clostridium perfringens