What does a 'Positive Fecal Leukocyte' test (e.g., using Methylene Blue stain) indicate?
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Correct answer: Inflammatory or invasive diarrhea
The presence of neutrophils in the stool indicates a disruption of the intestinal mucosa, typically caused by invasive bacteria or inflammatory bowel disease. Non-invasive pathogens like Vibrio cholerae or Giardia typically do not produce fecal leukocytes.
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