Production of bacteriocin-like-substance by Listeria innocua against Listeria monocytogenes

Cultures and culture filtrates of 129 Listeria innocua strains were examined for inhibitory activity against 18 strains of Listeria monocytogenes. Of the strains examined, 114 (88.4%) cultures and 126 (97.7%) culture filtrates had an inhibitory activity against strains of L. monocytogenes and most filtrates were sensitive to trypsin treatment. The authors concluded that most L. innocua strains produce a trypsin sensitive bacteriocin-like substance against L. monocytogenes.