A 67-year-old man presents to the emergency department with a 2-day history of severe diarrhea, abdominal cramping, and fever (38.5°C). His symptoms began approximately 36 hours after attending a catered event. Stool examination reveals the presence of a Gram-negative bacillus. Blood cultures are pending.
Based on the clinical presentation, which classification of diarrhea BEST describes the pathophysiological mechanism involved?
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