This 3-year-old girl was admitted to the Seoul National University Children's Hospital (SNUCH) for the fifth time on July 16, 1990, for a surgical intervention. She was born on September 19, 1987 via normal full term spontaneous delivery with the birth weight of 3.4 kg. The vaccination was done as scheduled The family history was unremarkable except for her maternal grandmother who had diabetes mellitus and grandfather died of stomach cancer. She had been healthy until June, 1988 (9 months of age) when her meal was changed from breast milk and weaning food to solid food. She experienced episodes of regurgitation and vomiting. The vomiting was intermittent and cyclic, and was not projectile or bilious. However, since her general condition was good the parents did not pay much attention for these symptoms On August 21, 1988 (11 months of age) she started to run fever with cough, for which she was brought to a local pediatric Clinic. With the 22impression of pneumonia she was managed With antibiotics. She developed diarrhea at that clinic, and was transferred to SNUCH.