FIG. 3.

Colonization of mouse spleens and livers by attenuated S. Typhimurium harboring plasmid pYA4088 grown in LB broth containing 0.1% arabinose. Shown is spleen (A) and liver (B) colonization by the indicated strains in BALB/c mice at 4 and 8 days postinoculation. *, no bacteria were detected by direct plating, but results were positive by selenite cysteine enrichment. These samples were scored as <10 CFU. The horizontal lines represent the means, and the error bars represent standard errors of the means.