To further determine whether IgE levels vary according to the progression of MPP, and to determine whether additional immunological markers also may be modulated over the course of this infection, we measured the serum levels of IgE, IL-4, IL-6, IL-10, and INF-γ and the percentages of CD3+, CD4+, and CD8+ cells in the acute and recovery phases of MP pneumonia as compared to non-MPP patients and normal controls (Table 1). Here, CD4 is linked to infection.