A 10-year-old male presents to your ED
complaining of gradual onset fevers, chills, diaphoresis, fatigue, myalgia,
malaise, headaches, nausea, and abdominal pain. He was hiking with
his Boy Scout troop 2 weeks ago and noted a small “bug” on
his arm. On physical examination, he has hepatomegaly and splenomegaly.
On laboratory data, he has anemia, thrombocytopenia, mild liver
dysfunction, and evidence of hemolysis. What is the most likely