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Anti-rTGEV-S serum IgG titers induced after intragastric immunization with recombinant LcS. Sera from groups of three mice immunized orally with 109 LcS (TGEV-S expressor or control non-expressor strains) were tested for the presence of rTGEV-S specific IgG by ELISA, using TGEV-S-GST as the coating antigen. Negative control sera from mice fed with PBS were also assayed. Bars represent the mean IgG titer ± S.E.M. in each group.
