FCEM2-0876
A 25-year-old from West Africa presents with joint pain, muscle pain, and symptoms similar to the flu. In the past day or two, he has also developed stomach pain and diarrhea. During the examination, his temperature is measured at 38.7°C, and he experiences tenderness in the upper right quadrant of his abdomen along with an enlarged liver and spleen. He remembers having an itchy rash and a few blisters on his arm after swimming in a local river a few weeks ago. Blood tests show a significant increase in eosinophils.
What is the MOST appropriate initial treatment option?