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The sera of neutralizing antibody titers in immunized mice at different time points. A Neutralizing antibody titers against EMC2012 at 4-, and 11-weeks after the last immunization. B Neutralizing antibody titers against England1 at 4-, and 11-weeks after the last immunization. C Neutralizing antibody titers against KNIH at 4 and 11 weeks after the last immunization. Bars represented the GMT ± geometric SD.
