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Journal of Clinical Microbiology, November 2006, p. 4229-4233, Vol. 44, No. 11
0095-1137/06/$08.00+0     doi:10.1128/JCM.01032-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Listeria monocytogenes Subgroups IIIA, IIIB, and IIIC Delineate Genetically Distinct Populations with Varied Pathogenic Potential{triangledown}

Dongyou Liu,1* Mark L. Lawrence,1 Martin Wiedmann,2 Lisa Gorski,3 Robert E. Mandrell,3 A. Jerald Ainsworth,1 and Frank W. Austin1

College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi 39762,1 Department of Food Science, Cornell University, Ithaca, New York 14853,2 Produce Safety and Microbiology Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Albany, California 947103

Received 17 May 2006/ Returned for modification 11 September 2006/ Accepted 12 September 2006

Listeria monocytogenes lineage III strains belonging to subgroups IIIA (n = 8), IIIB (n = 5), and IIIC (n = 6) were examined along with other known serotype strains (n = 11) by PCR and Southern hybridization using several recently described species-, virulence-, and serotype-specific primers and probes. The virulence of seven representative lineage III strains was then evaluated in mice via the intraperitoneal route. The results suggest that subgroup IIIA consists of typical rhamnose-positive avirulent serotype 4a and virulent serotype 4c strains, subgroup IIIC consists of atypical rhamnose-negative virulent serotype 4c strains, and subgroup IIIB consists of atypical rhamnose-negative virulent non-serotype 4a and non-serotype 4c strains, some of which may be related to serotype 7. It is possible that subgroup IIIB (including serotype 7) may represent a novel subspecies within L. monocytogenes.

* Corresponding author. Mailing address: College of Veterinary Medicine, Mississippi State University, P.O. Box 6100, Mississippi State, MS 39762. Phone: (662) 325-3559. Fax: (662) 325-1031. E-mail: liu{at}cvm.msstate.edu.

{triangledown} Published ahead of print on 27 September 2006.

Journal of Clinical Microbiology, November 2006, p. 4229-4233, Vol. 44, No. 11
0095-1137/06/$08.00+0     doi:10.1128/JCM.01032-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.





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