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Difficulty: MediumGastroenterology and Hepatology

Match each patient's gastrointestinal presentation with the most appropriate antimicrobial management strategy.

  • A 24-year-old man with 2 days of watery diarrhea, nausea, and cramping after eating at a buffet. Vital signs are normal and there is no gross blood.Supportive care with oral rehydration therapy alone
  • A 68-year-old hospitalized woman developing frequent, foul-smelling diarrhea and marked leukocytosis 5 days after completing a course of clindamycin.Targeted therapy with oral fidaxomicin
  • A 55-year-old man with cirrhosis presenting with fever, diffuse abdominal pain, and diagnostic paracentesis showing 500 neutrophils/mm³.Empiric therapy with intravenous ceftriaxone
  • A 30-year-old woman with chronic diarrhea, profound flatulence, and bloating after returning from a week-long camping trip in the mountains.Targeted therapy with oral tinidazole

Answer

Uncomplicated gastroenteritis requires only supportive care; C. difficile requires oral fidaxomicin; SBP requires IV ceftriaxone; and Giardiasis requires oral tinidazole.
Each specific clinical scenario warrants a distinct management approach, ranging from strict antibiotic stewardship in self-limiting disease to immediate intravenous antibiotics for life-threatening peritonitis.

Step-by-Step Solution

1
Evaluate the need for antibiotics in the 24-year-old with watery diarrhea.
Determine that his condition is an acute, uncomplicated gastroenteritis that does not require antibiotics.
Empiric antibiotics in stable patients with watery diarrhea violate antibiotic stewardship and can cause harm.
2
Diagnose the 68-year-old woman's hospital-acquired diarrhea.
Identify Clostridioides difficile infection as the cause, requiring oral fidaxomicin.
Post-antibiotic diarrhea with leukocytosis is a hallmark of C. difficile, which must be treated with specific oral agents.
3
Identify the cause of peritonitis in the cirrhotic patient.
Diagnose Spontaneous Bacterial Peritonitis (SBP) based on the ascitic fluid neutrophil count, requiring IV ceftriaxone.
Neutrophil count >250/mm³ confirms SBP, which is a life-threatening infection needing broad-spectrum IV coverage targeting gut flora.
4
Recognize the pathogen responsible for the camper's chronic diarrhea.
Identify Giardia lamblia, requiring targeted treatment with oral tinidazole.
Outdoor exposure followed by chronic malabsorptive symptoms is characteristic of Giardia.

Key Concept

Appropriate antimicrobial selection and antibiotic stewardship in gastrointestinal infections.
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Topics

Gastroenterology and Hepatology

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