Figure 7

Neutralization ability of the sera prepared from mice immunized with pPG612.1-VP4 and pPG612.1-VP4-LTB. The maximum reduction of CPE, expressed as a percentage of CPE obtained for the negative control samples, by using sera collected from mice fed with pPG612.1-VP4 or pPG612.1-VP4-LTB, was 50.28% ± 0.83% or 56.06% ± 0.77%, respectively. Statistically significant difference (** P < 0.01) was observed in sera of mice administered with recombinant strains. The neutralizing efficacy of anti-VP4 IgG from mice immunized with pPG612.1-VP4 was lower than antibodies obtained from mice immunized with pPG612.1-VP4-LTB and the difference was significant statistically (* P < 0.05,**P < 0.01). Results are mean values and standard errors (error bars) of triplicates.