A patient develops profuse watery diarrhea after shellfish consumption with dehydration. What is the most likely diagnosis and initial treatment?

A patient develops profuse watery diarrhea after shellfish consumption with dehydration. What is the most likely diagnosis and initial treatment?

• A. Cholera
• B. Salmonellosis
• C. Shigellosis
• D. Cryptococcosis parasite

Answer: (A)

Profuse watery diarrhea with dehydration after shellfish points to cholera. The cholera toxin triggers rapid secretion of water and electrolytes into the intestinal lumen, leading to large-volume, rice-water–like stools and quick, severe dehydration. This clinical picture—with exposure to contaminated seafood or water and profound fluid loss—fits cholera best, while the other infections are less likely: Salmonella or Shigella often present with fever and abdominal pain and may have blood in the stool, and Cryptococcus is a fungal infection not characterized by acute profuse diarrhea after seafood exposure. The most important initial treatment is rapid fluid and electrolyte replacement to reverse dehydration. Start aggressive isotonic intravenous fluids to restore perfusion and correct electrolyte losses; monitor urine output and vital signs, and transition to oral rehydration once stable. Antibiotics can shorten the illness and stool output but are adjuncts to rehydration, not a substitute for it. Avoid antimotility agents like loperamide in suspected cholera because they can worsen toxin retention.

Profuse watery diarrhea with dehydration after shellfish points to cholera. The cholera toxin triggers rapid secretion of water and electrolytes into the intestinal lumen, leading to large-volume, rice-water–like stools and quick, severe dehydration. This clinical picture—with exposure to contaminated seafood or water and profound fluid loss—fits cholera best, while the other infections are less likely: Salmonella or Shigella often present with fever and abdominal pain and may have blood in the stool, and Cryptococcus is a fungal infection not characterized by acute profuse diarrhea after seafood exposure.

The most important initial treatment is rapid fluid and electrolyte replacement to reverse dehydration. Start aggressive isotonic intravenous fluids to restore perfusion and correct electrolyte losses; monitor urine output and vital signs, and transition to oral rehydration once stable. Antibiotics can shorten the illness and stool output but are adjuncts to rehydration, not a substitute for it. Avoid antimotility agents like loperamide in suspected cholera because they can worsen toxin retention.