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Applied and Environmental Microbiology, July 2006, p. 5073-5076, Vol. 72, No. 7
0099-2240/06/$08.00+0     doi:10.1128/AEM.00435-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Isolation and Characterization of Listeria monocytogenes Isolates from Ready-To-Eat Foods in Florida{dagger}

Yuelian Shen,1 Yan Liu,1 Yifan Zhang,2 Jennifer Cripe,1 William Conway,3 Jianghong Meng,2 Grace Hall,1 and Arvind A. Bhagwat3*

Florida State Department of Agriculture and Consumer Services, Tallahassee, Florida,1 Department of Nutrition and Food Science, University of Maryland, College Park, Maryland 20742-7521,2 Produce Quality and Safety Laboratory, Henry A. Wallace Beltsville Agricultural Research Center, Agricultural Research Service, USDA, 10300 Baltimore Avenue, Bldg. 002, Room 117, BARC-W, Beltsville, Maryland 20705-23503

Received 22 February 2006/ Accepted 26 April 2006

Of 3,063 ready-to-eat food samples tested, 91 (2.97%) were positive for Listeria monocytogenes, and lineage 1 strains outnumbered lineage 2 strains 57 to 34. Seventy-one isolates (78%) exhibited multiple antibiotic resistance, and an L. monocytogenes-specific bacteriophage cocktail lysed 65 of 91 (71%) isolates. Determining phage, acid, and antibiotic susceptibility phenotypes enabled us to identify differences among strains which were otherwise indistinguishable by conventional methods.

* Corresponding author. Mailing address: Produce Quality and Safety Laboratory, Henry A. Wallace Beltsville Agricultural Research Center, Agricultural Research Service, USDA, 10300 Baltimore Avenue, Bldg. 002, Room 117, BARC-W, Beltsville, MD 20705-2350. Phone: (301) 504-5106. Fax: (301) 504-5107. E-mail: bhagwata{at}ba.ars.usda.gov.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

Applied and Environmental Microbiology, July 2006, p. 5073-5076, Vol. 72, No. 7
0099-2240/06/$08.00+0     doi:10.1128/AEM.00435-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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