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The ability of live attenuated Salmonella enterica serovar typhimurium (S. typhimurium) as a carrier of DNA vaccine was evaluated using model plasmid encoding beta-galactosidase (β-Gal) and BALB/c mice. We constructed pBRCMVβ, β-Gal expression apparatus having a replication origin from low copy pBR322. Comparison of the plasmid stability showed that pBRCMVβ remained stable in Salmonella even after oral administration, while pUC-based pCMVβ tended to be lost quickly. However, titers for β-Galdoi:10.1538/expanim.55.405 pmid:16880689 fatcat:cpzmxi35pbb7nmcpap4t2kjjui