Rotavirus Gastroenteritis
Acute Viral Enterotoxin-Mediated Intestinal Infection
Primary risk age: Infants and toddlers aged 3 to 24 months (Highly contagious)
- Urgency
- Moderate
- Typical age
- Infants and toddlers aged 3 to 24 months (Highly contagious)
- Body system
- Gastrointestinal System
Typical course: Acute viral shedding and structural resolution take 3 to 8 days.
Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13
1. Summary & Pathophysiology
Acute Viral Enterotoxin-Mediated Intestinal Infection
Pathophysiology (Development Path)
The virus selectively infects and destroys mature enterocytes on the villi of the small intestine. It produces the NSP4 enterotoxin, which triggers transcellular calcium-dependent chloride secretion. This leads to severe malabsorption of carbohydrates, impaired sodium-solute cotransport, and significant osmotic watery diarrhea.
Primary Causes & Etiology
Rotavirus (a double-stranded RNA virus belonging to the Reoviridae family).
2. Symptom Continuum
- Early Onset Signs
Abrupt onset of projectile vomiting, accompanied by moderate to high fever (38.5°C) lasting 1 to 2 days.
- Progressive Phase
Profuse, watery, non-bloody diarrhea (often described as smelling sweet or sour) occurring 10 to 20 times a day, leading to rapid fluid depletion.
- Severe Indicators
Signs of severe isotonic dehydration, including sunken fontanelles, absence of tears, dry mucous membranes, lethargy, prolonged capillary refill (>3 seconds), and oliguria.
3. Clinical Verification
Typically a clinical diagnosis based on sudden vomiting followed by watery diarrhea. It can be confirmed by detecting rotavirus antigen in stool samples using ELISA or latex agglutination assays.
4. Care & Elements Plan
Primary Care Treatment Plan
Prevent or correct dehydration. Use Oral Rehydration Salts (ORS) for mild-to-moderate dehydration, and transition to intravenous fluid replacement if the child is unable to tolerate oral intake.
Home Support Elements
Administer small, frequent sips of ORS (5-10 mL every 5 minutes). Continue breastfeeding or formula feeding as tolerated, and avoid juices or high-sugar fluids that can worsen diarrhea.
Generic Active Ingredients (No Brands)
- Oral Rehydration Salts (balanced glucose-electrolyte active blend)
- Zinc Sulfate (elemental zinc to promote intestinal epithelial recovery and shorten the course of diarrhea). Antimotility drugs are strictly avoided.
Lists active elements only. Never administer self-designed therapies.
5. Doctor Critical Lines
Critical Thresholds: When to See a Doctor
Seek immediate care if the child cannot retain fluids, exhibits extreme lethargy, has blood in the stool, or passes no urine for over 6 to 8 hours.
6. Vaccine & Prevention
Routine Prophylaxis (Prevention)
Rigorous hand washing, prompt disinfection of diaper-changing areas, and isolation of infected children.
Immunization Context
Live oral rotavirus vaccines (such as the 2-dose or 3-dose schedule) administered during early infancy, typically completed before 8 months of age.
7. Timelines & Outlook
Active Timeline
Acute viral shedding and structural resolution take 3 to 8 days.
Expected Prognosis
Excellent with appropriate rehydration therapy. Dehydration-related mortality is rare where ORS and medical care are readily accessible.
Potential Untreated Complications
Severe hypovolemic shock, metabolic acidosis, hypokalemia, and secondary transient lactose intolerance.
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