Ethanol tolerance of wild-type and mutant strains. L. monocytogenes LO28 wild-type (wt) and mutant strains carrying in-frame deletions of the cesR, cesK, lmo0443, lmo1416, lmo2210, and lmo2812 genes were grown in BHI medium containing 5% ethanol. The data represent the means of three experiments, in which the observed variation did not exceed 10%.