Objective To explore the cellular immune function and the changes of CD3+,CD4+,CD8++,CD4+/CD8+,CD19+,and the NK cells activity in children with henoch-schonlein purpura (HSP) combined with mycoplasma (MP) infection and investigate the correlation between the MP-infection and HSP.Methods 53 children with HSP children were choosed and divided into two groups (21 cases with MP-IgM positive group,and 32 cases with MP-IgM negative group).And 20 cases were selected as the control group in the same period.The acti...