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Título
Frozen Vegetable Processing Plants Can Harbour Diverse Listeria monocytogenes Populations: Identification of Critical Operations by WGS
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
Foods
Número de la revista
11
Datos de la obra
Truchado, P., Gil, M. I., Querido Ferreira, A. P., Capón, C. L., Álvarez Ordoñez, A., & Allende, A. (2022). Frozen Vegetable Processing Plants Can Harbour Diverse Listeria monocytogenes Populations: Identification of Critical Operations by WGS. Foods, 11(11), Article e1546. https://doi.org/10.3390/FOODS11111546
Editor
MDPI
Fecha
2022
Zusammenfassung
[EN]Frozen vegetables have emerged as a concern due to their association with foodborne outbreaks such as the multi-country outbreak of Listeria monocytogenes serogroup IVb linked to frozen corn. The capacity of L. monocytogenes to colonize food-processing environments is well-known, making the bacteria a real problem for consumers. However, the significance of the processing environment in the contamination of frozen foods is not well established. This study aimed to identify potential contamination niches of L. monocytogenes in a frozen processing plant and characterize the recovered isolates. A frozen vegetable processing plant was monitored before cleaning activities. A total of 78 points were sampled, including frozen vegetables. Environmental samples belonged to food-contact surfaces (FCS); and non-food-contact surfaces (n-FCS). Positive L. monocytogenes samples were found in FCS (n = 4), n-FCS (n = 9), and the final product (n = 1). A whole-genome sequencing (WGS) analysis revealed two clusters belonging to serotypes 1/2a-3a and 1/2b-3b). The genetic characterization revealed the presence of four different sequence types previously detected in the food industry. The isolate obtained from the final product was the same as one isolate found in n-FCS. A multi-virulence-locus sequence typing (MVLST) analysis showed four different virulence types (VT). The results obtained highlight the relevant role that n-FCS such as floors and drains can play in spreading L. monocytogenes contamination to the final product.
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SI
ID proyecto
- info:eu-repo/grantAgreement/AEI/Programa Estatal de Generación de Conocimiento y Fortalecimiento Científico y Tecnológico del Sistema de I+D+i/PID2019-104931RB-I00/ES/IDENTIFICACION DE FACTORES E IMPLEMENTACION DE PROCEDIMIENTOS DE INTERVENCION PARA EL CONTROL DE LISTERIA MONOCYTOGENES EN FRUTAS Y HORTALIZAS LISTAS PARA EL CONSUMO
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