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You are seeing a 6 year old boy who sustained a bee sting. He presents with diffuse urticaria, wheezing and shortness of breath, and crampy abdominal pain, nausea, and vomiting. There is no angioedema. His vital signs are: temperature 37.7 C, HR 140, RR 30, BP 76/36, pulse oximetry 92% on room air.