Pt is a 24 y/o male who comes into the ED due to copious amounts of bloody diarrhea over the past several days. Pt states they he is having an average of 7 BM per day, and that he has lost 10 pounds without trying to in the last month, since the sx began. On exam Pt is ill appearing w/ a HR of 110, BP 100/60, T 39C. What is your top differential at this time?
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