Table 1.

Subset of T lymphocytes in the peripheral blood (mean ± SD, %).

Groups	CD4+	CD8+	CD4+/CD8+
Normal	30.90 ± 3.76	20.82 ± 5.50	1.58 ± 0.51
TP	35.08 ± 3.02**	23.67 ± 3.83**	1.48 ± 0.51
TPG	33.90 ± 2.22**	23.42 ± 2.64**	1.45 ± 0.27
TPI	46.04 ± 3.52*	30.30 ± 3.52*	1.52 ± 0.42

*P < 0.05, TPI versus TP, TPG, Normal groups; **P < 0.05, TP versus Normal group, TPG versus Normal group.

TP: attenuated S. typhimurium with the eukaryotic expression vector; TPI: attenuated S. typhimurium with the eukaryotic expression plasmid carrying IL-2 gene; TPG: attenuated S. typhimurium with the eukaryotic expression plasmid carrying GFP gene.