Listeria innocua has a circular chromosome made up of 3,011,209 base pairs, with a 37% G+C content (6). Only 2,973 protein-coding genes were discovered in L. innocua, while no function could be predicted for 37% of the genes (6). The genome encodes a great variety of regulatory, surface and transport proteins (5). This explains why Listeria species can adapt to and inhabit such a wide range of environments. Listeria innocua was found to be deficient in a 10-kb virulence locus, a cluster of genes that engenders pathogenicity to Listeria monocytogenes (5). This explains why L. innocua typically does not infect humans or animals. It also has a circular plasmid of 81,905 base pairs whose function is unknown (6).