IL6 and infection: Consistent with previous findings [22, 23], LCMV-infected WT mice showed a significant increase of CCL2 on day 3 postinfection and IL-5 on day 7 postinfection, only, while TNF, IL-1β, IL-6, IFN-γ, CCL1 and CCL22 levels did not change following infection (Fig 6).