Fig. 3.
Survival curves of BALB/c mice injected with 50 μl PBS or immunized with 100 μg empty pVAX1, 100 μg pVAX-GRA1, 100 μg pVAX1-SAG1, 50 μg pVAX1-GRA1 + 50 μg pVAX1-SAG1, respectively, and challenged with 105 tachyzoites of T. gondii RH strain 4 weeks after last vaccination. Each group contained ten mice. Survival data were recorded until the end of the observation period