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Susceptibility of Salmonella enterica Typhimurium dry surface biofilms to disinfection

Duggan, Katrina, Shepherd, Mark and Maillard, Jean‐Yves ORCID: 2024. Susceptibility of Salmonella enterica Typhimurium dry surface biofilms to disinfection. Journal of Food Safety 44 (2) , e13117. 10.1111/jfs.13117

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In food preparation and manufacturing environments, surfaces contaminated with Salmonella can lead to outbreaks of Salmonellosis. We hypothesise that Salmonella resides on dry surfaces in a biofilm form leading to potential environmental persistence and transfer following contact. This is the first study reporting that Salmonella Typhimurium can form dry surface biofilm (DSB). Six disinfectants commonly used in the food industry were evaluated for their efficacy against the DSB. The two most efficacious formulations reduced bacterial viability in DSB by >99.99% when combined with mechanical removal (5 sec wiping; 300 g weight). Five out of six formulations significantly reduced bacterial transfer when combined with wiping. Complete eradication of Salmonella Typhimurium DSB was challenging, and mechanical removal was essential to produce a >99.99% reduction in bacterial viability within DSB. This study highlights a potential mode of survival of Salmonella Typhimurium on food‐contact surfaces and DSB challenges for disinfection.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Medicine
Additional Information: License information from Publisher: LICENSE 1: URL:
Publisher: Wiley
ISSN: 0149-6085
Date of First Compliant Deposit: 4 April 2024
Date of Acceptance: 16 March 2024
Last Modified: 04 Apr 2024 13:45

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