The relation between the diarrheal and other biological activities of Bacillus cereus involved in food poisoning outbreaks.

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Abstract
The culture filtrates of B. cereus strains isolated from diarrheal-type and vomiting-type food poisoning outbreaks were examined for their enterotoxigenicity, vascular permeability-enhancing (VP) activity and mouse lethality. Seven of 9 diarrheal strains were starch-hydrolysis positive; all vomiting ones were negative. All diarrheal strains elicited VP reaction, the vomiting strains did not. The mouse lethal activity of the diarrheal strains paralleled the VP activity; such was not the case with the vomiting strains. The culture filtrates of 4 diarrheal strains among 8 and none of vomiting strains caused fluid accumulation in the mouse ileal loop. The concentrated (50-fold) culture filtrates of 5 diarrheal strains of 8 caused fluid accumulation in rabbit ileal loops; only 3 of 21 vomiting strains did so.