A 10 year old girl presents with fever, vomiting, and mild generalized abdominal pain for 3 days. No other symptoms were present.

Her medical, surgical, family, and birth histories are unremarkable, while her growth and development have been normal so far. She is on a standard adult diet.

A complete blood count is significant for a Hb of 3.1 g/dL, MCV of 131 fL, and reticulocyte count of 10%. A liver profile reveals a serum bilirubin level of 5.1 mg/dL, with direct bilirubin amounting to 1.2 mg/dL.