To further confirm the role of Fpr2 in GBS infections, we prepared Fpr2-/- mice and infected GBS by i.p. Our results demonstrated that the survival rate of mice in the Fpr2-/- group was less than 50% at 48h after infection, which was significantly lower than that in the WT group (P<0.05, Figure 1A). This evidence concerns the gene FPR2 and infection.