Fig. 5
From: Development of ListeriaBase and comparative analysis of Listeria monocytogenes
Virulence genes appear in different strains and clustered as heat map. There are a total of 92 virulence genes existing in Listeria species, and 78 of these virulence genes are conserved in all 44 L. monocytogenes strains. Lineages I and II of L. monocytogenes contain more virulence genes than lineages III, whereas majority of the virulence genes vital for pathogenicity are absent in L. innocua and L. marthii