[Expert Solution]: A 3-year-old girl is brought to the office…

A 3-year-old girl is brought to the office by her parents for bloody diarrhea and a seizure. The parents say she started having fever, abdominal pain, and diarrhea about three days ago, but the bloody diarrhea started 12 hours ago. The seizure occurred three hours ago and consisted of repetitive movement of arms and legs with loss of consciousness. Her 4-year-old brother had symptoms of diarrhea two weeks ago. The blood pressure is 130/85 mm Hg, respirations are 25/min, pulse is 120/min, and temperature is 39.2deg C (102.6deg F). On physical examination, the patient looks pale and sleepy. Cardiopulmonary auscultation is normal, the abdomen is painful on palpation, and the skin assessment reveals the presence of disseminated pinpoint petechiae. The urinalysis shows hematuria, and the Coombs test is negative. Her complete blood count results are as follows:Hemoglobin7 g/dLHematocrit25 %Leukocyte count17,000/mm3Neutrophils70%Bands2%Eosinophils1%Basophils0%Lymphocytes22%Monocytes5%Platelet count7000/mm3Her coagulation results are as follows:Partial thromboplastin time (activated)30 sProthrombin time12 sReticulocyte count3 %Thrombin time< 2 s deviation from controlWhat is the most likely diagnosis?A.Disseminated intravascular coagulationB.Henoch-Schonlein purpuraC.Salmonella infectionD.Systemic vasculitisE.Hemolytic-uremic syndrome