Figure 7. Efficacy and immunogenicity of rMP12-PTNSs or rMP12-SFSNSs in mice.

Five-week-old CD1 mice were mock-vaccinated with PBS (n = 10) or vaccinated subcutaneously with 1×10⁵ pfu of MP-12 (n = 20), rMP12-NSsR173A (n = 10), rMP12-PTNSs (n = 9) or rMP12-SFSNSs (n = 10). Sera were collected at 42 days post vaccination, and mice were challenged with 1×10³ pfu of wt RVFV ZH501 strain (i.p) at 45 days post vaccination. Mice were observed for 21 days post-challenge. (A) Kaplan-Meier survival curves of vaccinated mice after wt RVFV challenge. (B) Neutralizing antibody titers of vaccinated mice (PRNT₈₀). Asterisk represents statistical significance (Mann-Whitney U-test, *p<0.05, **p<0.01 vs. rMP12-NSsR173A). (C) Anti-N IgG titer measured by IgG ELISA. Y-axis shows endpoint titers of sera. Asterisk represents statistical significance (Mann-Whitney U-test, *p<0.05, **p<0.01 vs. rMP12-NSsR173A). (D) Anti-NSs IgG level measured by IgG ELISA. Y-axis shows OD405 nm of sera at 1∶100 dilutions, and cut-off at 0.204 is shown as dotted line.