The bacterial gastroenteritis that can lead to vomiting, profuse diarrhea, or death is caused by a comma-shaped organism known as Vibrio cholerae.

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Recognize the organism that causes a life-threatening secretory gastroenteritis: a comma-shaped, curved Gram-negative bacterium that produces cholera toxin. This toxin drives massive water and electrolyte loss in the intestine by increasing cAMP in enterocytes, leading to extreme watery diarrhea often described as rice-water stools and rapid dehydration that can be fatal if not treated promptly. Transmission typically follows ingestion of contaminated water or seafood, and outbreaks occur where sanitation is poor.

Among the options, only this curved organism matches both the morphology and the characteristic severe, watery diarrhea with vomiting due to cholera toxin. The other bacteria cause diarrheal illnesses as well, but their shapes, toxins, and clinical patterns differ (for example, some cause dysentery with blood, while others produce diarrhea through different toxins or mechanisms).