Objective:To explore the relationship between subclinical trace element deficiency and immunoglobulin (Ig) G subclass deficiency.Methods: Using DCP AES method,the concentrations of 11 kinds of trace elements,T lymphocyte subsets and T lymphocyte proliferation response were measured in the serum of 38 children with IgG subclass deficiency.Effects before and after replenishing zinc and iron were observed in these patients.Results:The levels of serum Z...