Review Question - QID 213642

A 12-year-old boy is brought to his pediatrician with a 1 week history of a rash. He recently returned from a safari vacation with his family and said that he became ill during the trip. He describes getting a high fever, sore throat, cough, and myalgias. He was evaluated at a village clinic and received a medication to treat this infection. He started noticing the rash on the plane ride back and also says that he has been falling more often because he feels unsteady on his feet. Physical exam reveals the rash shown in Figure A as well as an ataxic gait. The medication that was most likely given to this patient would also be effective in treating which of the following diseases?