Most Probable Numbers of Listeria Species in Raw Meats Detected by Selective Motility Enrichment

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We evaluated the methods of direct plate count (DPC) on Modified Oxford agar and most probable number (MPN) using Fung-Yu tubes for the detection of natural contamination by Listeria spp. by examining 100 retail samples of raw meat (beef, lamb, pork, and turkey). Listeria monocytogenes was isolated from 10 samples. Other Listeria spp. (L. innocua, L. murrayi, and L. welshimeri) were isolated from 27 samples. Despite the fact that very low numbers of Listeria were found on these products, the MPN method was significantly more sensitive than the DPC method. The isolation efficiencies of the MPN and DPC methods were 31 and 17%, respectively. Quantitation of indigenous Listeria showed that many meat samples contaminated with ≤ 4 colony-forming units (CFU) per g tested negative by the DPC method but positive by the MPN method.


Document Type: Research Article

Affiliations: 1: Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas 66506, USA; Departmentof Applied Microbiology and Food Science, 51 Campus Drive, University of Saskatchewan, Saskatoon, Sask, S7N 5A8, Canada 2: Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas 66506, USA

Publication date: September 1, 1995

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