Journal
FEMS MICROBIOLOGY LETTERS
Volume 242, Issue 2, Pages 231-240Publisher
OXFORD UNIV PRESS
DOI: 10.1016/j.femsle.2004.11.011
Keywords
genetic diversity; Aeromonas hydrophila
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Aeromonas hydrophila strains recovered from clinical samples and ambient sources were phenotypically and genetically identified. in addition, the distribution of putative virulence factors was assayed. To determine the genetic diversity of these strains, random amplification of polymorphic DNA (RAPD) and enterobacterial repetitive intergenic consensus (ERIC)-PCR markers were used. The discriminatory ability of the techniques, using Simpson's index, was 0.96 for both methods. The most consistent dendrogram was obtained when RAPD and ERIC data were combined. The genetic diversity revealed a high intra-specific genetic diversity (h = 0.364 +/- 0.024 and I = 0.538 +/- 0.030). The strains showed a tendency to cluster according to their origin of isolation (best-cut test 0.80 and bootstrap values >50%). The present study demonstrates and quantifies the high intra-specific diversity within this species and reveals a clear differentiation of strains according to their ecological origin. The distribution of virulence-related genes confirm that A. hydrophila is a genetically heterogeneous species that harbour ecotypes which have different pathogenic potential to human and other animals. (C) 2004 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.
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