Immune status in recurrent pneumonia The reduction of IgA (5.5%), IgG (4.1%), IgM (4.1%); IgG1 reduction rate (2.1%); IgG2 (2.1%), IgG3 (2.8%), IgG4 (14.5%); The reduction of CD3 (21.4%), CD4 (26.9%), CD8 (10.3%), CD19 (2.8%) and CD56 (5.5%).