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You are working locum tenens in Breckenridge, Colorado, and see a 2 year old boy with irritability, vomiting, and poor appetite. He has no fever or diarrhea and no one else in his family is affected. The family landed in the Denver airport the night before and drove to Breckenridge. The patient awoke this morning with these symptoms. 

Which of the following is recommended treatment for one of the likely causes for his symptoms?