A 15 years old girl, was referred to Infectious ward of Imam Reza Hospital with high fever, moderated jaundice, bradycardia diarrhea, confusion and blanching erythromatous maculopapular rash.In abdominal examination the liver was felt two-cm beyond the ribs and spleen was just palpable. The patient was pale and had impairment of co- ordination. Her mother gave the history of a couple a weeks fever and two times gasterointestinal hemorrhages.The temperature was 34.5 centigrade, pulse 65 beats/min.Bloodpressure100/60.Urine was dark and Sclerae were icteric. She had no dyspenea, No neck rigidity and no convulsion. The patient and her family are living in a town in the south of Khorassan province, Laboratory tests performed in the patient's residing town were: WBC 10500, Neut 65%, Lym 25%, Mono 9%, Baso 1%, Eo 0%, CRP ++, ESR 25, In urine analysis protein was trace with normal cytologyThe patient had been adminestered Ampicillin, Cefexime and Co-trimoxazole. The patient hospitalized, and her drugs were discontinued and new laboratory tests performed:Stool and Blood culture, CBC (HI), Bilirobine (T and D), SGOT, SGPT, HBSAg, HCV anti, IgM anti HAV, PT, PTT, LDH, Ret. Count, urine analysis, febrile agglutination tests, and a CX Ray, abdominal ultrasonography and EKG were done and IV liquids started. The results of laboratory tests were: HCT 36, Platelate 50000,WBC 3500, Dif. Count %, Neut 50, Lym 40, Mono 9, Baso 1, PT 15, :pTT 45, Ret count 2.5, ESR (mm/hr) 40, MCV 79, Al phos 4.00,HBSAg Neg, anti- HCV Neg, anti HAV IgM Neg, Bil (T) 4, Bil (D) 1, SGOT 120, SGPT 110, Wright (STA) Neg, Vidal 1/80, CX Ray= normal, abdominal Sonography normal, Blood cult (1 st report) Neg, Urinalysis, Protein, Trace, WBC 1-2/ hpf, Urobilinogene ++, Bact Neg. Because of bicytopenia, bone marrow needle aspiration puncture performed and it was normal bone marrow, except for Erythroleukophagocytosis. After receiving a laboratory result the diagnosis became clear.