Listeria monocytogenes is the species of pathogenic bacteria that reasons the infection listeriosis. it's far a facultative anaerobic bacterium, able to survive in the presence or absence of oxygen. it can grow and reproduce inside the host's cells and is one of the maximum virulent foodborne pathogens: 20 to 30% of foodborne listeriosis infections in excessive-risk people can be deadly. Responsible for an envisioned 1, six hundred ailments and 260 deaths in the united states of America yearly, listeriosis ranks 1/3 in overall number of deaths among foodborne bacterial pathogens, with fatality charges exceedingly even Salmonella spp. and Clostridium botulinum.