Cytokine levels in the AP and CP phases of the different groups of patients. (A) IFN-γ, (B) IL-4, (C) IL-15, (D) IL-10, (E) MCP-3, and (F) IFN-α2. The dotted line indicates the lower limit of detection. aSignificantly different from the control group. bSignificantly different from the silent infection group at the AP phase. *Significantly different from the baseline level within group (CP phase vs. AP phase).