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Survival curves of BALB/c (white symbols) and C57BL/6 mice (black symbols) after intravenous infection with nonpassaged and passaged B. pseudomallei NCTC 7431. ●, 5 × 103 CFU of NCTC 7431; 
, 3 × 105 CFU of NCTC 7431; ◊, 5 × 103 CFU of NCTC 7431; □, 3 × 105 CFU of NCTC 7431; ▾, 2 × 102 CFU of mouse-passaged strain NCTC 7431; ▵, 2 × 102 CFU of mouse-passaged strain NCTC 7431.
