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Difficulty: MediumInfectious Diseases

A 32-year-old man comes to the clinic for follow-up of a diarrheal illness. Three days ago, he developed fever, diffuse abdominal cramping, and multiple episodes of watery, non-bloody diarrhea after attending a family picnic. He was seen at an urgent care clinic yesterday where a stool culture was obtained and intravenous fluids were administered. Today, he reports that his fever has resolved and his diarrhea is beginning to improve, though he still has 2 to 3 loose stools per day. He is able to tolerate oral fluids and feels well-hydrated. His temperature is 37.1°C (98.8°F), blood pressure is 122/80 mmHg, and pulse is 76/min. The urgent care clinic forwards his stool culture results, which are positive for non-typhoidal *Salmonella enterica*. Susceptibility testing shows the isolate is pan-susceptible. Which of the following is the most appropriate antimicrobial management?

  1. A
    Oral ciprofloxacin for 3 days
  2. B
    Oral azithromycin for 3 days
  3. C
    Oral trimethoprim-sulfamethoxazole for 5 days
  4. No antimicrobial therapy is indicatedAnswer
  5. E
    Intravenous ceftriaxone for 1 dose

Answer

No antimicrobial therapy is indicated
The correct answer is that no antimicrobial therapy is indicated. This patient is a healthy young adult presenting with a resolving case of uncomplicated non-typhoidal Salmonella gastroenteritis. In immunocompetent individuals with mild to moderate disease, antimicrobial therapy is not indicated because it does not significantly shorten the duration of symptoms. Furthermore, antibiotic therapy can paradoxically increase the risk of prolonged asymptomatic carriage and fecal shedding of the organism. Therefore, standard management for uncomplicated cases relies strictly on supportive care with oral fluid and electrolyte replacement.

Step-by-Step Solution

1
Assess the patient's clinical status and risk factors.
The patient is a healthy 32-year-old with improving diarrhea, normal vital signs, and no immunocompromising conditions.
Determines whether the patient falls into a high-risk category that would require antibiotic therapy.
2
Interpret the laboratory findings in the context of the clinical picture.
Stool culture is positive for non-typhoidal Salmonella, but symptoms are resolving with supportive care.
Identifies the pathogen to guide specific management decisions.
3
Apply standard treatment guidelines for non-typhoidal Salmonella.
Antibiotics are withheld; management continues with supportive care alone.
In immunocompetent hosts, antibiotics for Salmonella gastroenteritis do not improve outcomes and may prolong bacterial shedding.

Key Concept

Uncomplicated non-typhoidal Salmonella gastroenteritis in immunocompetent patients should be managed with supportive care only, as antibiotics can prolong fecal shedding of the organism.
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Topics

Infectious Diseases

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