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Survival rate of mice immunized with pVAX-CDPK3, pVAX I, PBS and nothing followed by challenge with 1 × 103 tachyzoites 2 weeks after the last immunization. The mice immunized with pVAX-CDPK3 were dead from day 10 to 24 that showed an increased survival time (13.5 ± 4.89 days) compared with mice in the control groups (pVAX1, PBS, blanking controls) died within 7 days after challenge (P < 0.05).
