Minimal differences were detected for monocyte chemoattractant protein 1 (MCP-1), RANTES, IL-2, IFN-γ, IL-10, IL-12(p40), and IL-12(p70), except during primary infection with D39Δ1098 and D39ΔproB (Fig. 5 and Fig. S3 and S4). Here, IL2 is linked to infection.