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T. gondii antibody response after the immunization of VLPs alone without the SAG1 antigen. The sera of mice were collected at 4 weeks after the first and second immunization, respectively. (A) IgG, (B) IgG1, (C) IgG2a, and (D) IgA antibody responses were evaluated using the sera at the time point, respectively. The groups were divided as follows: the immunization step: the normal group and immunization group (the group immunized with VLP alone, without SAG1).
