the immunogenicity of γ-irradiated tachyzoites of a highly virulent strain of toxoplasma gondii (rh strain) was investigated. immunized mice survived challenge infection and displayed increased interferon gamma (inf-γ ) production. on the other hand, nonimmunized controls died after 10 days and displayed a significantly decreased lymphoproliferative response to concanavalin a (con a). no tachyz...
