Roseola Infantum (Sixth Disease)
Viral Exanthema Subitum
Primary risk age: 6 Months to 2 Years
- Urgency
- Moderate
- Typical age
- 6 Months to 2 Years
- Body system
- Infectious & Parasitic
Typical course: 5 to 7 days total.
Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13
1. Summary & Pathophysiology
Viral Exanthema Subitum
Pathophysiology (Development Path)
HHV-6 replication in leukocytes triggers a high fever. Defervescence follows viral clearance, leading to immune-complex deposition in the skin and the characteristic rose-colored rash.
Primary Causes & Etiology
Human Herpesvirus 6 (HHV-6); occasionally Human Herpesvirus 7 (HHV-7).
2. Symptom Continuum
- Early Onset Signs
High spikes of sudden fever (39.5°C to 40.5°C) lasting 3 to 5 days. Child is otherwise active.
- Progressive Phase
Rapid defervescence (fever drops) on day 4 or 5, immediately followed by the appearance of a non-itchy, rose-pink maculopapular rash on the trunk, spreading to neck and limbs.
- Severe Indicators
Febrile seizures during the initial rapid temperature spike, extreme irritability, bulging fontanelle (rare), and poor oral intake.
3. Clinical Verification
Clinical evaluation based on the high fever followed by sudden rash after defervescence.
4. Care & Elements Plan
Primary Care Treatment Plan
Supportive care. Maintain hydration and manage fever with antipyretics.
Home Support Elements
Lukewarm sponge baths. Encourage fluids. Monitor temperature spikes closely.
Generic Active Ingredients (No Brands)
- Acetaminophen or Ibuprofen (active ingredients for fever control)
- Oral rehydration solution (for hydration).
Lists active elements only. Never administer self-designed therapies.
5. Doctor Critical Lines
Critical Thresholds: When to See a Doctor
Seek emergency care if a febrile seizure occurs, the child is lethargic, or the rash becomes purpuric.
6. Vaccine & Prevention
Routine Prophylaxis (Prevention)
Standard contact hygiene. Avoid contact with children in the febrile phase.
Immunization Context
No vaccine available.
7. Timelines & Outlook
Active Timeline
5 to 7 days total.
Expected Prognosis
Excellent. Self-limiting; rash fades in 1 to 2 days without scarring.
Potential Untreated Complications
Febrile seizures, encephalitis (extremely rare).
More in Systemic Contagious Viral Exanthems
Severe Measles (Rubeola)
Highly Contagious Paramyxoviral Exanthematous Disease
Unvaccinated infants, young children, and adolescents.
Moderate Varicella Zoster (Chickenpox)
Acute Alphaherpesviral Vesicular Exanthematous Disease
Unvaccinated preschool and school-aged children.
Mild Erythema Infectiosum (Fifth Disease)
Parvovirus-Induced Exanthem
4 to 10 Years