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Difficulty: MediumPediatric Infectious Diseases

A 10-month-old boy is brought to the pediatric clinic by his parents due to a new-onset skin eruption. For the past three days, the infant experienced a high fever, with home temperature readings reaching up to 39.8°C (103.6°F). Despite the elevated temperature, he remained playful and continued to breastfeed normally. Early this morning, the fever abruptly resolved. A few hours later, the parents noticed a pink, blanching, maculopapular rash that began on his chest and abdomen before spreading to his neck and proximal extremities. His only other symptom is mild, clear rhinorrhea. He has received all age-appropriate vaccinations up to his 6-month well-child visit. His current temperature is 37.1°C (98.8°F), pulse is 110/min, and respiratory rate is 24/min. Physical examination confirms the maculopapular exanthem and reveals mild suboccipital lymphadenopathy. Lung auscultation is clear bilaterally. Which of the following is the most appropriate next step in management?

  1. Reassurance and supportive careAnswer
  2. B
    Prescription of a 10-day course of oral amoxicillin
  3. C
    Administration of the live-attenuated measles, mumps, and rubella vaccine
  4. D
    Administration of nebulized albuterol
  5. E
    Swabbing of the rash and initiation of intravenous acyclovir

Answer

Reassurance and supportive care
The patient's clinical presentation is classic for roseola infantum, also known as exanthema subitum. This illness, most commonly caused by human herpesvirus 6 (HHV-6), is characterized by 3 to 5 days of high fever (often >39.5°C) in an infant who otherwise appears remarkably well and playful. The hallmark of the disease is the abrupt resolution of the fever (defervescence), which is immediately followed by the eruption of a blanching, pink, maculopapular rash that typically starts on the trunk and spreads to the neck and extremities. Because roseola is a benign and self-limited viral illness, the only appropriate management is reassurance of the parents and supportive care. No antibiotics, antivirals, or targeted respiratory interventions are indicated.

Step-by-Step Solution

1
Analyze the temporal relationship between the fever and the rash.
The infant had 3 days of high fever followed by abrupt defervescence, immediately followed by the appearance of a truncal maculopapular rash.
The timing of a rash relative to a fever is the most critical diagnostic clue for pediatric viral exanthems.
2
Identify the specific clinical syndrome.
The pattern of 'fever breaks, then rash appears' in a well-appearing infant is the pathognomonic presentation of roseola infantum (exanthema subitum), primarily caused by human herpesvirus 6 (HHV-6).
Pattern recognition distinguishes roseola from other exanthems like measles or rubella, where the rash typically occurs concurrently with the fever.
3
Determine the appropriate management for this syndrome.
Roseola is a benign, self-limited viral infection. It requires no specific pharmacologic intervention.
Avoiding unnecessary diagnostics, antibiotics, or antivirals prevents iatrogenic harm and aligns with best practices for self-resolving viral illnesses.

Key Concept

Diagnosis and management of roseola infantum (exanthema subitum)
Estimated Time:1m 0s
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Topics

Pediatric Infectious Diseases

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