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Applied and Environmental Microbiology, April 2005, p. 2175-2178, Vol. 71, No. 4
0099-2240/05/$08.00+0 doi:10.1128/AEM.71.4.2175-2178.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Viscoelasticity of Staphylococcus aureus Biofilms in Response to Fluid Shear Allows Resistance to Detachment and Facilitates Rolling Migration
Cory J. Rupp,1,2
Christoph A. Fux,1 and
Paul Stoodley1,2,3,4*
Center for Biofilm Engineering,1
Department of Mechanical and Industrial Engineering,2
Department of Microbiology, Montana State University, Bozeman, Montana,3
Center for Genomic Sciences, Allegheny-Singer Research Institute, Pittsburgh, Pennsylvania4
Received 10 May 2004/
Accepted 5 November 2004
Staphylococcus aureus is a leading cause of catheter-related bloodstream infections and endocarditis. Both involve (i) biofilm formation, (ii) exposure to fluid shear, and (iii) high rates of dissemination. We found that viscoelasticity allowed S. aureus biofilms to resist detachment due to increased fluid shear by deformation, while remaining attached to a surface. Further, we report that S. aureus microcolonies moved downstream by rolling along the lumen walls of a glass flow cell, driven by the flow of the overlying fluid. The rolling appeared to be controlled by viscoelastic tethers. This tethered rolling may be important for the surface colonization of medical devices by nonmotile bacteria.
* Corresponding author. Mailing address: Center for Genomic Sciences, Allegheny-Singer Research Institute, 320 E. North Ave., Pittsburgh, PA 15212. Phone: (412) 359-6876. Fax: (412) 359-6995. E-mail:
pstoodle{at}wpahs.org.
Applied and Environmental Microbiology, April 2005, p. 2175-2178, Vol. 71, No. 4
0099-2240/05/$08.00+0 doi:10.1128/AEM.71.4.2175-2178.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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