Listeriosis is recognised as lesser-known foodborne illness opportunistic foodborne infection caused by Listeria monocytogenes in humans. The disease is manifested in one of the several clinical forms: gastroenteritis, meningitis, neuro-encephalitis, chorioamnionitis, abortions, febrile gastroenteritis, and neonatal infections. The disease is relatively rare in occurrence, however, in immunocompromised patients, the mortality rate can go up to 20–30%. The patients commonly affected are expectant mothers, new-borns, the elderly people with co-morbidities, or people with impaired/compromised immune system. Although the infection can also take place in normal individuals. In addition to humans, L. monocytogenes is associated with invasive disease in many different animal species, including farm ruminants (cattle, sheep, and goats). Only some strains of L. monocytogens (more common) and L. ivanovii are pathogenic and have been associated with diseases.