Universal Pre-enrichment Broth BD Difco™ 500 g. Used for recovering sublethally injured Salmonella and Listeria from food products. Traditionalmethods for recovering Salmonella and Listeria from food products require separate preenrichmentmedia for each microorganism. Some broth media recommended for pre-enrichmentcontain antibiotic inhibitors or have insufficient buffering capacity which hinder recovery ofsublethally injured cells.