Virulence of S. enterica serovar Typhimurium strains JSG210 (WT), RLK5 (ΔhycB), RLK7 (ΔhycC), RLK9 (quadruple mutant), and ALZ43 (triple mutant) on BALB/c mice. The results shown are for 15 mice infected as described for the ALZ43 strain and 8 mice each as described for the WT, RLK5, RLK7, and RLK9 strains. Another experiment yielded a similar result.