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2004:
Ryu J-H; Kim H; Frank J F; Beuchat L R
Attachment and biofilm formation on stainless steel by Escherichia coli O157:H7 as affected by curli production.
Letters in applied microbiology 2004;
39(
4):.
AIMS: The aim of this study was to determine the role of curli in attachment and biofilm formation by Escherichia coli O157:H7 on stainless steel. METHODS AND RESULTS: Three curli-deficient strains (43895-, 43894- and E0018-) and three curli over-producing strains (43895+, 43894+ and E0018+) of E. coli O157:H7 were studied. Stainless steel coupons (SSC) were immersed in cell suspensions of each strain for 24 h at 4 degrees C. The number of cells attached to SSC was determined. To determine the ability of attached cells to form biofilm, SSC were immersed in 10% of tryptic soya broth up to 6 days at 22 degrees C. Curli-deficient and curli-producing strains did not differ in their ability to attach to SSC, but only curli-producing strains formed biofilms. CONCLUSIONS: Curli production by E. coli O157:H7 does not affect attachment of cells on stainless steel but curli-producing strains are better able to form biofilms. SIGNIFICANCE AND IMPACT OF THE STUDY: Curli production by E. coli O157:H7 enhances its ability to form biofilm on stainless steel, thereby potentially resulting in increased difficulty in removing or killing cells by routine cleaning and sanitizing procedures used in food-processing plants.
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