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Survival curves of BALB/c mice after challenge. Survival curves of BALB/c mice injected with PBS, pVAX1, pVAX1-TgSPATR and the blank group, challenged with 100 tachyzoites of T. gondii RH strain 2 weeks after the last immunization. Each group comprised 10 mice. Statistically significant differences (p < 0.05) are indicated by an asterisk.
