Vaccination withToxoplasma gondiiSAG-1 Protein Is Protective against Congenital Toxoplasmosis in BALB/c Mice but Not in CBA/J Mice

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Abstract
We evaluated the effect of vaccination with the SAG1 protein ofToxoplasma gondiiagainst congenital toxoplasmosis in mice with different genetic backgrounds. In BALB/c mice (H-2d), vaccination reduced the number of infected fetuses by 50% and was associated with a mixed type 1 and type 2 immunity. In CBA/J mice (H-2k), vaccination increased the number of infected fetuses by 50% and was associated with a predominant type 2 response. Our results indicate that the effect of vaccination with SAG1 is controlled by the genetic background of the mouse.