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Applied and Environmental Microbiology, September 2008, p. 5563-5567, Vol. 74, No. 17
0099-2240/08/$08.00+0     doi:10.1128/AEM.00319-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Differences in Survival among 13 Listeria monocytogenes Strains in a Dynamic Model of the Stomach and Small Intestine{triangledown}

Ioanna M. Barmpalia-Davis,1 Ifigenia Geornaras,1 Patricia A. Kendall,2 and John N. Sofos1*

Center for Meat Safety & Quality and Food Safety Cluster, Department of Animal Sciences,1 Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, Colorado 805232

Received 6 February 2008/ Accepted 21 June 2008

Thirteen Listeria monocytogenes strains were compared for the ability to survive in a dynamic gastrointestinal model. Strains displayed various degrees of susceptibility to gastric acidity; however, strain-to-strain variations became evident mainly after 90 min of exposure (pH 2.0). Cell levels transferred to the intestine depended on initial populations, while reductions during intestinal exposure were relatively small for all strains.

* Corresponding author. Mailing address: Department of Animal Sciences, 1171 Campus Delivery, Colorado State University, Fort Collins, CO 80523-1171. Phone: (970) 491-7703. Fax: (970) 491-0278. E-mail: john.sofos{at}colostate.edu

{triangledown} Published ahead of print on 27 June 2008.

Applied and Environmental Microbiology, September 2008, p. 5563-5567, Vol. 74, No. 17
0099-2240/08/$08.00+0     doi:10.1128/AEM.00319-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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