Fig 4.

Percent CFU of each strain in lymph nodes prior to dissemination. Mice were exposed to a 1:1:1 ratio of spores of the three strains and sacrificed 24 to 30 h later. For the six mice with more than 120 CFU detected in the cLNs or mLNs but no detectable CFU in the kidneys or liver, the percent CFU of each strain was calculated. n = 30 mice infected in two experiments; HT, heat treated to kill vegetative bacilli; UT, untreated; <LOD, below lower limit of detection (4 CFU); <120 CFU, fewer than 120 CFU.