How does the World Health Organization define persistent diarrhea?

• A. Episodes lasting less than 7 days
• B. Episodes lasting 7-14 days
• C. Episodes lasting 14 days or longer
• D. Episodes lasting longer than 30 days

Answer: (C)

The main idea here is how diarrhea is categorized by duration. The World Health Organization defines persistent diarrhea as episodes that last fourteen days or longer. This cutoff matters because it distinguishes transient, typically self-limiting episodes from those that may reflect ongoing inflammation, malabsorption, or other underlying conditions that require a broader workup and a more comprehensive treatment plan.

Recognizing a diarrheal episode as persistent prompts attention to nutritional impact, hydration status, and possible etiologies such as chronic infections or malabsorption syndromes, rather than treating it like a brief, self-limited illness. Shorter durations—diarrhea lasting less than fourteen days—are considered acute and usually managed with standard rehydration and supportive care.