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The Biofilm formation ability of Listeria monocytogenes isolated from meat, poultry, fish and processing plant environments is related to serotype and pathogenic profile of the strains

Meloni, Domenico and Mazza, Roberta and Piras, Francesca and Lamon, Sonia and Consolati, Simonetta Gianna and Mureddu, Anna and Mazzette, Rina (2012) The Biofilm formation ability of Listeria monocytogenes isolated from meat, poultry, fish and processing plant environments is related to serotype and pathogenic profile of the strains. Veterinary science development, Vol. 2 (1), e12. eISSN 2038-9701. Article.

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DOI: 10.4081/vsd.2012.e12

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Abstract

In the present study, the relationships between serotype, pathogenic profile and in vitro biofilm formation of 106 Listeria monocytogenes strains, having no epidemiological correlation and isolated from different environmental and food sources, were analyzed. The quantitative assessment of thein vitro biofilm formation was carried out by using a microtiter plate assay with spectrophotometric reading (OD620). The isolates were also submitted to serogrouping using the target genes lmo0737, lmo1118, ORF2819, ORF2110, prs, and to the evaluation of the presence of the following virulence genes: prfA, hlyA, rrn, inlA, inlB, iap, plcA, plcB, actA and mpl, by multiplex PCRs. The 62% of the strains showed weak or moderate in vitro ability in biofilm formation, in particular serotypes 1/2b and 4b, frequently associated with sporadic or epidemic listeriosis cases. The 25% of these isolates showed polymorphism for the actA gene, producing a fragment of 268-bp instead of the expected 385-bp. The deletion of nucleotides in this gene seems to be related to enhanced virulence properties among these strains. Strains belonging to serotypes associated with human infections and characterized by pathogenic potential are capable to persist within the processing plants forming biofilm.

Item Type:Article
ID Code:9050
Status:Published
Refereed:Yes
Uncontrolled Keywords:Listeria monocytogenes, serotype, pathogenic profile, biofilm
Subjects:Area 07 - Scienze agrarie e veterinarie > VET/04 Ispezione degli alimenti di origine animale
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Medicina Veterinaria
Publisher:Pagepress
eISSN:2038-9701
Copyright Holders:©Copyright D. Meloni et al., 2012 Licensee PAGEPress srl, Italy
Deposited On:15 May 2013 15:58

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