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Optical DNA-DNA Homology in the Genus Listeria

University of Leicester, P. O. Box 138, University Road, Leicester LE1 9HN, United Kingdom

^* Corresponding author.

ABSTRACT

Twenty-three strains of the seven recognized Listeria species were studied by using DNA-DNA optical hybridization. The level of error in the data was low. Our results supported the results of Rocourt et al. (J. Rocourt, F. Grimont, P. A. D. Grimont, and H. P. R. Seeliger, Curr. Microbiol. 7:383-388, 1982), although there was some overlap between Listeria monocytogenes and Listeria innocua. We suggest that there may be more than one cluster in the species L. monocytogenes or the species may form a large spectrum of relatedness. The level of intraspecies homology in L. monocytogenes is very broad, as determined in both this study and other studies.

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