Acute gastroenteritis who criteria definition
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WHO criteria definition acute gastroenteritis
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Here is a clear, structured answer on the WHO definition and diagnostic criteria for acute gastroenteritis (AGE):
WHO Definition of Acute Gastroenteritis
The World Health Organization (WHO) defines acute gastroenteritis as:
3 or more loose or watery stools per 24-hour period, with a duration of less than 14 days.
This is the most widely used operational definition globally, particularly for epidemiological surveillance and clinical trials.
Core Diagnostic Criteria
| Feature | WHO / Standard Definition |
|---|---|
| Diarrhea | ≥3 loose/watery stools in 24 hours (or more frequent than normal for the individual) |
| Onset | Rapid / acute |
| Duration | < 14 days (episodes lasting ≥14 days are classified as persistent diarrhea) |
| Associated symptoms | May include nausea, vomiting, abdominal cramps, and fever |
| Isolated vomiting | NOT sufficient alone to diagnose AGE |
Key Clinical Points
- Diarrhea is the required feature. Isolated vomiting without diarrhea should not be labeled as gastroenteritis - it has a broader differential (Tintinalli's Emergency Medicine).
- Duration thresholds:
- Acute: < 14 days
- Persistent: 14-29 days
- Chronic: ≥ 30 days
- Etiology may be viral (most common - norovirus, rotavirus), bacterial (Salmonella, Shigella, Campylobacter, E. coli), or parasitic. The clinical definition is pathogen-agnostic.
- Dehydration is the most important and dangerous complication, especially in children under 5 and the elderly.
AAFP Expanded Definition (Clinical Practice)
The American Academy of Family Physicians defines AGE as:
"A diarrheal disease of rapid onset, with or without nausea, vomiting, fever, or abdominal pain - involving increased stool frequency or altered stool consistency unrelated to chronic conditions."
This is functionally concordant with the WHO definition and is used for pediatric and adult clinical practice.
Global Burden
- 1.7 billion cases and ~1.45 million deaths annually worldwide
- Second leading cause of death in children under 5 globally
- Norovirus is the most common pathogen in developed countries; rotavirus predominates where vaccination is limited
Sources: Tintinalli's Emergency Medicine (9th ed.), StatPearls (NCBI), AAFP AFP 2019;100(3):159, WHO Diarrhoeal Disease Fact Sheet
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