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IgG levels in sera of mice infected with T. gondii RH strain. Mouse sera were assessed for IgG responses by ELISA using ROP4 virus-like particles (VLPs) or tissue lysate antigens (TLA). IgG antibody responses elicited from 3 different infection doses were measured. (A) 5×103 RH tachyzoites. (B) 1×104 RH tachyzoites. (C) 5×104 RH tachyzoites. *P<0.05, **P<0.01.
