Risk of Listeria monocytogenes contamination of raw ready-to-eat seafood products available at retail outlets in Japan
- PMID: 20348310
- PMCID: PMC2869148
- DOI: 10.1128/AEM.01456-09
Risk of Listeria monocytogenes contamination of raw ready-to-eat seafood products available at retail outlets in Japan
Abstract
Examination of Listeria monocytogenes prevalence among ready-to-eat foods in Japan revealed frequent (5.7 to 12.1%) contamination of minced tuna and fish roe products, and the isolates had the same virulence levels as clinical isolates in terms of invasion efficiency and infectivity in cell cultures and a murine infection model, respectively. Premature stop codons in inlA were infrequent (1 out of 39 isolates). Cell numbers of L. monocytogenes in minced tuna and salmon roe increased rapidly under inappropriate storage temperatures (from a most probable number [MPN] of 10(0) to 10(1)/g to an MPN of 10(3) to 10(4)/g over the course of 2 days at 10 degrees C). Thus, regulatory guidelines are needed for acceptable levels of L. monocytogenes in these foods.
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