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Survival of BALB/c and DBA-2 mice infected intraperitoneally with different doses of S. enterica serovar Typhimurium wild-type and SA123 strains. Infection doses were 10 CFU/mouse (▪), 50 CFU/mouse (▴), 250 CFU/mouse (▾), 1,250 CFU/mouse (♦), and 6,250 CFU/mouse (•). Asterisks indicate mortality curves showing significant differences between the wild-type and mutant strains.
