Antibody responses of hamsters immunized with Lig DNA vaccines, as measured by ELISA. Recombinant LigAni, LigBni, LigBrep, LigBct1, and LigBct2 proteins were used as antigens in the ELISA. The results are expressed as the mean absorbances for all of the animals in each group. OD492, optical density at 492 nm. *, P < 0.05 compared to the group that received the empty pTARGET plasmid.