Table 1.

Determination of the specific anti-T. gondii IgG subclass profile in the sera of BALB/c mice immunized with pcDNA3.1, naked pGRA4 and pGRA4/liposome complexes

Immunization regimen	OD405
	IgG	IgG1	IgG2a
Control pcDNA3.1	0.209±0.018	0.178±0.013	0.195±0.018
pGRA4	0.791±0.064	0.176±0.012	0.563±0.039
pGRA4/liposome	0.853±0.080	0.186±0.019	0.621±0.045

Each group comprised eleven mice. The results are expressed as mean±SD and represent one of three similar experiments