Short Communications
Vol. 3 No. 1 (2014)
https://doi.org/10.4081/ijfs.2014.1708

Case of contamination by Listeria monocytogenes in mozzarella cheese

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Received: 13 May 2013
Accepted: 10 September 2013
Published: 4 March 2014
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Listeria monocytogenes, Mozzarella, PFGE, Serotypes

Authors

Sara Greco
sara.greco@izslt.it
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Rita Tolli
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Teresa Bossù
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Eda Maria Flores Rodas
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Fabiola Di Giamberardino
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Alessandro Di Sirio
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Silvia Vita
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Veronica De Angelis
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Stefano Bilei
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Michele Sonnessa
Dipartimento di Sanità Pubblica Veterinaria e Sicurezza Alimentare, Istituto Superiore di Sanità, Roma, Italy.
Antonietta Gattuso
Dipartimento di Sanità Pubblica Veterinaria e Sicurezza Alimentare, Istituto Superiore di Sanità, Roma, Italy.
Luigi Lanni
Direzione Operativa Controllo degli Alimenti, Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Roma, Italy.
Following a Listeria monocytogenes detection in a mozzarella cheese sampled at a dairy plant in Lazio Region, further investigations have been conducted both by the competent Authority and the food business operatordairy factory (as a part of dairy factory HACCP control). In total, 90 dairy products, 7 brine and 64 environmental samples have been tested. The prevalence of Listeria monocytogenes was 24.4% in mozzarella cheese, and 9.4% in environmental samples, while brines were all negatives. Forty-seven strains of L. monocytogenes have been isolated, all belonging to 4b/4e serotype. In 12 of these, the macrorestriction profile has been determined by means of pulsed field gel electrophoresis. The profiles obtained with AscI enzyme showed a 100% similarity while those obtained with ApaI a 96.78% similarity. These characteristics of the isolated strains jointly with the production process of mozzarella cheese has allowed to hypothesise an environmental contamination.

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1.
Case of contamination by Listeria monocytogenes in mozzarella cheese. Ital J Food Safety [Internet]. 2014 Mar. 4 [cited 2026 Mar. 12];3(1). Available from: https://www.pagepressjournals.org/ijfs/article/view/ijfs.2014.1708

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