Similar to the reduced levels of IL-8, levels of pro-inflammatory cytokines IL-1α,−1β,−4, and−6 as well as LCN2 were also reduced upon P4 ΔentA infection in mammary gland homogenates of both mouse strains compared with their P4-infected counterparts (P ≤ 0.08; Figure 7). Here, LCN2 is linked to infection.