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Open AccessArticle

Persistent Listeria monocytogenes Isolates from a Poultry-Processing Facility Form More Biofilm but Do Not Have a Greater Resistance to Disinfectants than Sporadic Strains

1
Department of Food Hygiene and Technology, Veterinary Faculty, University of León, E-24071 León, Spain
2
Institute of Food Science and Technology, University of León, E-24071 León, Spain
*
Author to whom correspondence should be addressed.
Pathogens 2019, 8(4), 250; https://doi.org/10.3390/pathogens8040250
Received: 23 September 2019 / Revised: 19 October 2019 / Accepted: 27 October 2019 / Published: 20 November 2019
(This article belongs to the Section Human Pathogens)
Some strains of Listeria monocytogenes can persist in food-processing environments, increasing the likelihood of the contamination of foodstuffs. To identify traits that contribute to bacterial persistence, a selection of persistent and sporadic L. monocytogenes isolates from a poultry-processing facility was investigated for biofilm-forming ability (crystal violet assay). The susceptibility of sessile cells to treatments (five minutes) with sodium hypochlorite having 10% active chlorine (SHY: 10,000 ppm, 25,000 ppm, and 50,000 ppm) and benzalkonium chloride (BZK: 2500 ppm, 10,000 ppm, and 25,000 ppm) was also studied. All isolates exhibited biofilm formation on polystyrene. Persistent strains showed larger (p < 0.001) biofilm formation (OD580 = 0.301 ± 0.097) than sporadic strains (OD580 = 0.188 ± 0.082). A greater susceptibility to disinfectants was observed for biofilms of persistent strains than for those of sporadic strains. The application of SHY reduced biofilms only for persistent strains. BZK increased OD580 in persistent strains (2500 ppm) and in sporadic strains (all concentrations). These results indicate that the use of BZK at the concentrations tested could represent a public health risk. Findings in this work suggest a link between persistence and biofilm formation, but do not support a relationship between persistence and the resistance of sessile cells to disinfectants. View Full-Text
Keywords: Listeria monocytogenes; persistent strains; sporadic strains; biofilm formation; resistance to disinfectants Listeria monocytogenes; persistent strains; sporadic strains; biofilm formation; resistance to disinfectants
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MDPI and ACS Style

Rodríguez-Campos, D.; Rodríguez-Melcón, C.; Alonso-Calleja, C.; Capita, R. Persistent Listeria monocytogenes Isolates from a Poultry-Processing Facility Form More Biofilm but Do Not Have a Greater Resistance to Disinfectants than Sporadic Strains. Pathogens 2019, 8, 250.

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