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Objective:To study hemolytic Streptococcus infection relationship with Henoch-Schonlein Purpura in children.Methods:42 cases in children with Henoch-Schonlein Purpura (Observer Group) and healthy children in 40 cases of physical examination (the control group) for blood antistreptolysin O (ASO) detection,observation group at the same time children are divided into (belly-non-abdominal Purpura and Purpura group set and repeatedly attacks groups and the Group of non-recurrent) for statistical analysis.