Abstract
Three hundred Listeria isolates were examined for inhibitory activities using a deferred antagonism plating assay. Approximately 75% of the surveyed isolates produced inhibitory activity, the majority of which (71%) resulted from the production of bacteriophage or defective bacteriophage particles. Twenty-three isolates (8%) produced inhibitory activities distinct from those resulting from bacteriophage. Four of these isolates (Listeria innocua 743, L. innocua 755, L. innocua 228, L. monocytogenes 538) produced heat-stable, protease sensitive peptides, which demonstrated broad-spectrum inhibitory activities against all L. monocytogenes serotypes tested.
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