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  • Title: Immunization with E. coli produced recombinant T. gondii SAG1 with alum as adjuvant protect mice against lethal infection with Toxoplasma gondii.
    Author: Petersen E, Nielsen HV, Christiansen L, Spenter J.
    Journal: Vaccine; 1998 Aug; 16(13):1283-9. PubMed ID: 9682392.
    Abstract:
    Polyclonal rabbit antibodies against recombinant Toxoplasma gondii SAG1 antigen expressed in E.coli recognize T. gondii and the antibodies significantly reduced T.gondii adherence and/or invasion into the host cell as did a monoclonal antibody against a conformational epitope of the SAG1 antigen. Groups of outbread NMRI mice were immunized with recombinant T. gondii SAG1 antigen in alum. The antibody response to immunizations was dominated by a Th2 response with production of T.gondii specific IgG1 antibodies. Challenge with tachyzoites from the virulent RH-strain produced a Th1 response dominated by the production of specific IgG2a antibodies and moderately boosted the IgG1 response, and challenge with bradyzoites from the avirulent SSI119-strain showed the same pattern. Immunization with rSAG1 resulted in a significant increased survival after challenge with tachyzoites of the RH-strain. Immunization with E.coli expressed recombinant SAG1 in alum induce partial protective immunity against lethal infection with T. gondii in mice.
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