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Infection and Immunity, August 2005, p. 5198-5203, Vol. 73, No. 8
0019-9567/05/$08.00+0     doi:10.1128/IAI.73.8.5198-5203.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Biofilm Formation by Salmonella enterica Serovar Typhimurium and Escherichia coli on Epithelial Cells following Mixed Inoculations

Cristina L. C. Esteves, Bradley D. Jones, and Steven Clegg*

Department of Microbiology, College of Medicine, University of Iowa, Iowa City, Iowa 52242

Received 10 March 2005/ Returned for modification 29 March 2005/ Accepted 4 April 2005

Biofilms were formed by inoculations of Salmonella enterica serovar Typhimurium and Escherichia coli on HEp-2 cells. Inoculations of S. enterica serovar Typhimurium and E. coli resulted in the formation of an extensive biofilm of S. enterica serovar Typhimurium. In experiments where an E. coli biofilm was first formed followed by challenge with S. enterica serovar Typhimurium, there was significant biofilm formation by S. enterica serovar Typhimurium. The results of this study indicate that S. enterica serovar Typhimurium can outgrow E. coli in heterologous infections and displace E. coli when it forms a biofilm on HEp-2 cells.

* Corresponding author: Department of Microbiology, University of Iowa College of Medicine, 51 Newton Road, 3334 -BSB, Iowa City, IA 52242. Phone: (319) 335-7778. Fax: (319) 335-9006. E-mail: steven-clegg{at}uiowa.edu.

Editor: A. D. O'Brien

Infection and Immunity, August 2005, p. 5198-5203, Vol. 73, No. 8
0019-9567/05/$08.00+0     doi:10.1128/IAI.73.8.5198-5203.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.





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