• Previously healthy child with 2 day history of a “slapped cheek” rash that has spread to the reset of the body, low-grade fever and malaise, most consistent with Parvovirus B19 which is not treated with medication
• Key idea: Although Parvovirus most associated with “slapped cheek” rash, it also can lead to reticular, erythematous rash on their extremities and trunk
• Reminder: Parvovirus B19 associated with development of aplastic anemia

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I'd love to hear an explanation for this if anyone has one. I was thoroughly stumped

From UTD:

Erythema infectiosum — Parvovirus B19 most classically causes erythema infectiosum (EI), a mild febrile illness with rash. It often occurs in outbreaks among school-aged children, although it can occur in adults as well [16]. EI is also referred to as "fifth disease" since it represents one of six common childhood exanthems, each named in order of the dates they were first described.

The illness begins with nonspecific prodromal symptoms, such as fever, coryza, headache, nausea, and diarrhea (table 1). These constitutional symptoms coincide with onset of viremia. Two to five days later, the classic erythematous malar rash appears with relative circumoral pallor (the so-called slapped cheek rash). This facial rash is often followed several days later by a reticulated or lacelike rash on the trunk and extremities (picture 1A-B). https://www.uptodate.com/contents/clinical-manifestations-and-diagnosis-of-parvovirus-b19-infection