Suspect Clostridioides difficile Infection (CDI)
In a patient presenting with acute enteritis one month post-cesarean section, Clostridioides difficile infection should be the primary suspect, particularly if she received perioperative antibiotics. 1
Clinical Reasoning
Why CDI is the Top Suspect
The timing and clinical presentation strongly suggest antibiotic-associated diarrhea. Post-cesarean patients routinely receive prophylactic antibiotics, which is the single most important risk factor for CDI. The one-month timeframe falls within the typical window for CDI development following antibiotic exposure 1.
Key risk factors present in this scenario:
- Recent antibiotic use (standard perioperative prophylaxis for cesarean)
- Recent hospitalization
- Acute diarrhea presentation
Diagnostic Approach
Confirm the clinical picture first:
- Verify ≥3 loose stools in 24 hours
- Rule out obvious alternative causes (laxative use, other medications)
- Assess for associated symptoms: abdominal pain, cramping, fever 1
Laboratory testing should only proceed if diarrhea is confirmed. Testing formed stool leads to false positives and unnecessary treatment 1. The diagnosis requires both clinical symptoms AND positive laboratory evidence of toxigenic C. difficile 1.
Alternative Considerations (Less Likely)
While the evidence discusses other post-cesarean infections 2, 3, these typically present differently:
Endometritis (most common post-cesarean infection) presents with fever, uterine tenderness, and abnormal vaginal discharge—not primarily enteritis 2.
Wound infections manifest with incisional symptoms, not gastrointestinal complaints 2, 3.
Drug-induced fever can occur with β-lactam antibiotics but wouldn't cause acute enteritis as the primary presentation 4.
Common enteric bacterial pathogens (Salmonella, Campylobacter, E. coli) are possible but less specifically linked to the post-cesarean context 5. Mode of delivery has minimal impact on adult intestinal bacterial infection risk 5.
Critical Pitfalls to Avoid
- Do not test asymptomatic patients or those with formed stools—this leads to identifying colonization rather than infection 1
- Do not delay testing in appropriate candidates—early identification allows prompt treatment and infection control 1
- If the patient has ileus and cannot produce stool, PCR testing of perirectal swabs is an acceptable alternative with 95.7% sensitivity 1
Clinical Context Matters
The 2019 WSES guidelines emphasize that CDI diagnosis requires integration of clinical presentation with laboratory confirmation 1. Recent antibiotic administration and hospitalization are the most useful clinical factors for selecting patients who warrant testing 1.