Figure 3From: Protective effect of recombinant staphylococcal enterotoxin A entrapped in polylactic-co-glycolic acid microspheres against Staphylococcus aureus infectionSerum antibody analysis. Antibody levels in mice serum. Sera were collected from vaccinated and unvaccinated controls as described in the text. The error bars indicate standard errors of the means for five mice per group. The asterisks indicate P values (*, P < 0.05; **, P < 0.01, compared with the PBS group).Back to article page