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In the last decade, atypical  Listeria monocytogenes  and  L. innocua  strains have been detected in food and the environment. Because of mutations in the major virulence genes, these strains have different virulence intensities in eukaryotic cells. In this study, we performed phenotypic and genotypic characterization of atypical  L. monocytogenes  and  L. innocua  isolates obtained from swine slaughterhouses and meat markets. Forty strains were studied, including isolates of  L. monocytogenes  and  L. innocua  with low-hemolytic activity. The isolates were characterized using conventional phenotypic  Listeria  identification tests and by the detection and analysis of  L. monocytogenes -specific genes. Analysis of 16S rRNA was used for the molecular identification of the  Listeria  species. The  L. monocytogenes  isolates were positive for all of the virulence genes studied. The atypical  L. innocua  strains were positive for  hly, plcA,  and  inlC . Mutations in the InlC, InlB, InlA, PI-PLC, PC-PLC, and PrfA proteins were detected in the atypical isolates. Further  in vitro  and transcriptomic studies are being developed to confirm the role of these mutations in  Listeria  virulence.

biomed research international

Phenotypic and Genotypic Characterization of Atypical<i>Listeria monocytogenes</i>and<i>Listeria innocua</i>Isolated from Swine Slaughterhouses and Meat Markets

Phenotypic and Genotypic Characterization of AtypicalListeria monocytogenesandListeria innocuaIsolated from Swine Slaughterhouses and Meat Markets