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Alía, Alberto; Andrade, María J.; Rodríguez, Alicia; Martín, Irene; Pérez-Baltar, Aida; Medina, Margarita; Córdoba, Juan J.
Food science & technology, June 2020, 2020-06-00, Volume: 128Journal Article
The Listeriamonocytogenes diversity throughout deboning, compressing and slicing of Spanish dry-cured ham processing among and within 6 production plants after cleaning and disinfection in two different seasons (autumn/winter and spring/summer) was evaluated in this work. L. monocytogenes isolates (n = 66), collected from deboning area (72.7%) and compressing and slicing areas (27.3%), were serotyped as 1/2b (65.1%), 1/2a (27.3%), 1/2c (6.1%) and 4b (1.5%) by PCR-based methods. The typing of the 66 isolates of L. monocytogenes by PFGE using the ApaI and SgsI enzymes revealed a high diversity with 52 pulsotypes and showed cross-contamination within each plant. The frequency of isolation of L. monocytogenes was higher in spring/summer than in autumn/winter. Although L. monocytogenes was not detected in any of the analyzed dry-cured ham samples, the presence of some pulsotypes and cross-contamination in the different industries suppose a hazard of contamination by this pathogen during deboning and slicing of dry-cured ham. The use of molecular typing techniques, such as PCR-based methods and PFGE characterization, could be used to trace the sources, distribution and routes of L. monocytogenes contamination throughout deboning and slicing of dry-cured ham. •L. monocytogenes prevalence in dry-cured ham deboning and slicing areas was 9.16%.•Most of the L. monocytogenes in deboning and slicing areas were serotyped as 1/2b.•The frequency of L. monocytogenes was higher in spring/summer than in autumn/winter.•Cross-contamination between deboning, compressing and slicing areas was detected.
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