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An 8 year old boy comes in with 2 days of fever, chills, myalgias, headache, and a few episodes of non-bloody, non-bilious vomiting. He also has a faint maculopapular rash beginning on his legs. It is influenza season. He has no past medical history. He was bitten 4 days ago by the class pet rat that the teacher bought from a commercial pet store the week before. He went hiking 3 days ago and to Disneyland 2 days ago. He has no drug allergies and takes no medications.