NDLI: Detection of Virulence Genes and Growth Potential in Listeria monocytogenes Strains Isolated from Ricotta Salata Cheese.

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Detection of Virulence Genes and Growth Potential in Listeria monocytogenes Strains Isolated from Ricotta Salata Cheese.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Coroneo, Valentina Carraro, Valentina Aissani, Nadhem Sanna, Adriana Ruggeri, Alessandra Succa, Sara Meloni, Barbara Pinna, Antonella Sanna, Clara
Spatial Coverage	United States Italy
Description	Country affiliation: Italy Author Affiliation: Coroneo V ( Dept. of Public Health, Clinical and Molecular Medicine, Univ. of Cagliari, Italy, Via Porcell 4, 09124, Cagliari, Italy.); Carraro V ( Dept. of Public Health, Clinical and Molecular Medicine, Univ. of Cagliari, Italy, Via Porcell 4, 09124, Cagliari, Italy.); Aissani N ( Dept. of Life and Environmental Sciences, Univ. of Cagliari, Via Ospedale, 72, 09124, Cagliari, Italy.); Sanna A ( Dept. of Public Health, Clinical and Molecular Medicine, Univ. of Cagliari, Italy, Via Porcell 4, 09124, Cagliari, Italy.); Ruggeri A ( Dept. of Public Health, Clinical and Molecular Medicine, Univ. of Cagliari, Italy, Via Porcell 4, 09124, Cagliari, Italy.); Succa S ( Dept. of Public Health, Clinical and Molecular Medicine, Univ. of Cagliari, Italy, Via Porcell 4, 09124, Cagliari, Italy.); Meloni B ( Dept. of Public Health, Clinical and Molecular Medicine, Univ. of Cagliari, Italy, Via Porcell 4, 09124, Cagliari, Italy.); Pinna A ( Dept. of Public Health, Clinical and Molecular Medicine, Univ. of Cagliari, Italy, Via Porcell 4, 09124, Cagliari, Italy.); Sanna C ( Dept. of Public Health, Clinical and Molecular Medicine, Univ. of Cagliari, Italy, Via Porcell 4, 09124, Cagliari, Italy.)
Abstract	Ricotta Salata is a traditional ripened and salted whey cheese made in Sardinia (Italy) from sheep's milk. This product is catalogued as ready-to-eat food (RTE) since it is not submitted to any further treatment before consumption. Thus, foodborne pathogens, such as Listeria monocytogenes, can represent a health risk for consumers. In September 2012, the FDA ordered the recall of several batches of Ricotta Salata imported from Italy linked to 22 cases of Listeriosis in the United States. This study was aimed at evaluating the presence and virulence properties of L. monocytogenes in 87 samples of Ricotta Salata produced in Sardinia. The ability of this product to support its growth under foreseen packing and storing conditions was also evaluated in 252 samples. Of the 87 samples 17.2% were positive for the presence of L. monocytogenes with an average concentration of 2.2 log10 cfu/g. All virulence-associated genes (prfA, rrn, hlyA, actA, inlA, inlB, iap, plcA, and plcB) were detected in only one isolated strain. The Ricotta Salata samples were artificially inoculated and growth potential (Î´) was assessed over a period of 3 mo. The value of the growth potential was always >0.5 log10 cfu/g under foreseen packing and storing conditions. This study indicates that Ricotta Salata supports the L. monocytogenes growth to levels that may present a serious risk to public health, even while stored at refrigeration temperatures.
File Format	HTM / HTML
ISSN	00221147
Issue Number	1
Volume Number	81
e-ISSN	17503841
Journal	Journal of Food Science
Language	English
Publisher	Wiley (on behalf ofInstitute of Food Technologists)
Publisher Date	2016-01-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Food science Bacterial Proteins Genetics Cheese Microbiology Listeria Monocytogenes Listeriosis Virulence Factors Animals Economics Humans Italy Growth & Development Isolation & Purification Milk Sheep United States Journal Article
Content Type	Text
Resource Type	Article
Subject	Food Science

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