Objective: Hemolytic uremic syndrome (HUS) is characterized by microangiopathic hemolytic anemia, thrombocytopenia and acute renal failure. The most common form of HUS in children is Shigatoxin-producing Escherichia coli (STEC) related HUS. HUS is the most common causeof acute renal failure in Europe whereas it was not observed in the same frequency in our country. However, in 2011, after the outbreak of Escherichia coli (E. Coli) gastroenteritis and HUS in Germany, we observed significantly increased cases of HUS in our country. In this retrospective study, we aimed to determine the clinical features and prognosis of HUS patients who admitted with a history of diarrhea during this breakout.