Table 2.

Blood levels of IgM, IgG₁ ,and IgA (mean ± SD) (mg/dL).

Groups	IgM	IgG1	IgA
Normal	3.07 ± 0.47	0.56 ± 0.15	1.28 ± 0.44
TP	10.52 ± 0.76*	2.58 ± 0.43*	2.01 ± 0.73
TPG	8.56 ± 0.76*	2.37 ± 0.61*	1.86 ± 0.12
TPI	20.37 ± 1.11**	4.47 ± 0.51**	2.55 ± 0.34

*P < 0.01, TP, TPG versus Normal group; **P < 0.01, TPI versus TP, TPG and 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.