Case of contamination by Listeria monocytogenes in mozzarella cheese

Submitted: 13 May 2013
Accepted: 10 September 2013
Published: 4 March 2014
Abstract Views: 2853
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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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Greco S, Tolli R, Bossù T, Flores Rodas EM, Di Giamberardino F, Di Sirio A, Vita S, De Angelis V, Bilei S, Sonnessa M, Gattuso A, Lanni L. Case of contamination by Listeria monocytogenes in mozzarella cheese. Ital J Food Safety [Internet]. 2014 Mar. 4 [cited 2024 Jul. 13];3(1). Available from: