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Difficulty: EasyPediatric Infectious Diseases

A 13-month-old girl is diagnosed with roseola infantum (exanthema subitum), a common childhood illness primarily caused by Human Herpesvirus 6 (HHV-6). Arrange the classic clinical events of this viral infection in the chronological order they typically occur.

  1. 1Sudden onset of a high fever (typically ≥39.5∘C\geq 39.5^\circ\text{C} or 103.1∘F103.1^\circ\text{F})
  2. 2Abrupt defervescence (resolution of the fever) after 3 to 5 days
  3. 3Eruption of a blanching maculopapular exanthem primarily on the trunk
  4. 4Centrifugal spread of the exanthem to the face, neck, and extremities

Answer

The classic chronological sequence of roseola infantum is: 1) sudden onset of high fever, 2) abrupt defervescence, 3) appearance of a truncal maculopapular rash, and 4) centrifugal spread of the rash to the extremities.
Roseola infantum (exanthema subitum) is classically caused by Human Herpesvirus 6 (HHV-6). The hallmark chronological sequence begins with 3 to 5 days of sudden, high fever (often without other localizing signs). This is followed by an abrupt resolution of the fever (defervescence). Coinciding with or immediately following the drop in temperature, a blanching, rose-pink maculopapular rash erupts. This rash characteristically begins on the trunk and spreads centrifugally to the neck, face, and extremities. Recognizing this specific timeline is crucial for differentiating roseola from other childhood exanthems like measles, where the rash occurs concurrently with the fever.

Step-by-Step Solution

1
Recognize the initial prodromal phase of HHV-6 infection.
Identifies that the illness starts with a sudden, isolated high fever.
The viral replication phase causes a significant systemic febrile response, typically without focal clinical signs.
2
Identify the transition point of the illness.
Notes that the fever abruptly resolves (defervescence) after 3 to 5 days.
This rapid drop in temperature is the classic hallmark event that precedes the exanthem in roseola.
3
Describe the initial appearance of the exanthem.
Places the truncal maculopapular rash immediately after the fever breaks.
The rash of roseola is highly distinct because it appears only after the fever has completely resolved, starting centrally on the trunk.
4
Describe the progression of the exanthem.
Notes the centrifugal spread to the neck, face, and extremities.
The rash expands outward from the trunk over the next 24 to 48 hours before fading without desquamation.

Key Concept

Clinical progression sequence of roseola infantum (Human Herpesvirus 6)
Estimated Time:45s
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Topics

Pediatric Infectious Diseases

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