Listeria monocytogenes

L. monocytogenes is a gram-positive bacterium that is found worldwide in feces, soil, decaying plant material, feed, and water. It has become increasingly found as a cause of clinical disease in backyard chicken flocks.

L. monocytogenes can infect large numbers of possible mammalian hosts, in addition to birds, insects, and crustaceans.

Different strains of Listeria show strong host preference, suggesting that genetic determinants guide host-pathogen interactions


  • chickens
  • humans
  • mammals

Associated Diseases