Fig. 1

a Pan-genome visualization of selected strains, b viability (Log(CFU/ml)) of L. monocytogenes strain S2542, ScottA, and RO15 before and after the pressure treatment 400 MPa, 8 min. a Phylogenetic tree have been calculated using the core genomes of the indicated strains. L. monocytogenes strain names were shown at the end of the phylogenetic tree branch. The matrix shows presence (blue) and absence (white) of the core and strain-specific genes. b Effect of HPP on cell survival. 0 min represents samples plated on agar just after pressure treatment, 24 h and 48 h represent samples that were allowed to recover for 24 h and 48 h at 8 °C and plated on agar. Strain S2542 is presented in red, ScottA in green, and RO15 in blue. For each experimental group individual values of three biological replicates (HPP of independent bacterial cultures) and box-and-whiskers with median and 25th–75th percentile are shown. Data was analysed by pairwise Student’s t-test and differences between groups were considered statistically significant at p-values < 0.05 (indicated by *)