Boxplots of the distribution of growth parameters for strains representing each genetic lineage of Listeria monocytogenes at 7°C. (A) Growth rate in brain–heart infusion (BHI), (B) growth rate in BHI + 6% NaCl, and (C) lag phase duration in BHI + 6% NaCl. The horizontal bar indicates the median for each lineage; I, lineage I; II, lineage II; III, lineage III. Boxes represent the 25th to 75th percentile of the values; whiskers represent the 10th and 90th percentiles. Values outside the 10th to 90th percentiles are represented by filled circles.