A 10-year-old girl is brought to the physician because of high-grade fever, myalgia, and generalized fatigue for 3 days. She returned from a vacation to northern Brazil 4 days ago. She took the appropriate medications and immunizations prior to her visit. There is no family history of serious illness. She appears ill. Her temperature is 39.4°C (103°F), pulse is 110/min and blood pressure is 94/54 mm Hg. Examination shows jaundice of the conjunctivae and skin. The abdomen is soft and nontender; the spleen is palpated 2 to 3 cm below the left costal margin. Laboratory studies show:Hemoglobin 10.1 g/dLLeukocyte count 4,650/mm3Platelet count 200,000/mm3Serum Glucose 56 mg/dLCreatinine 0.8 mg/dLBilirubin Total 4.7 mg/dLDirect 0.9 mg/dLLactate dehydrogenase 212 U/LWhich of the following is the most likely to confirm the diagnosis?

Then try StudyFetch, the AI-powered platform that can answer your questions and teach you more about it!