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ΔsecDF mutant is less virulent in mice. Intravenous infection of C57BL/6 female mice with WT L. monocytogenes and ΔsecDF mutant bacteria. Bacterial CFU were numerated at 72 h p.i. from livers and spleens taken from 6 infected mice per group. Horizontal bars represent the means. The P value was calculated using a t test.
