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Protection of r-SAG1 against infection with tachyzoites of Toxoplasma gondii. Sixteen BALB/C mice were immunized with r-SAG1 of T. gondii and 11 mice were injected with PBS as a control. The mice were challenged with 1X105 tachyzoites of Toxoplasma gondii RH at 9 wk post immunization. The number of the dead mice was counted.
