this is an important etiological agent of summer diarrhea

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Vibrio cholerae is the classic cause of summer diarrhea because warm temperatures and contaminated water or shellfish create ideal conditions for outbreaks. This organism produces cholera toxin, which raises cAMP in intestinal cells and triggers a rapid, secretory type of diarrhea with large volumes of watery stools and severe dehydration. That strong association with warm weather and waterborne transmission makes it the best fit for “summer diarrhea.” The other organisms can cause diarrhea, but their patterns aren’t as tightly linked to the warm-season, waterborne outbreaks: Salmonella Typhi causes typhoid fever with prolonged fever and systemic symptoms, Rotavirus mainly affects young children and is not specifically a summer-only pattern, and certain E. coli types cause traveler's or pediatric diarrhea but don’t define the classic summer-diarrhea phenomenon.