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Appl. Environ. Microbiol., Feb 1996, 443-449, Vol 62, No. 2
Copyright © 1996, American Society for Microbiology

Species-Specific Detection of Vibrio anguillarum in Marine Aquaculture Environments by Selective Culture and DNA Hybridization

J Martinez-Picado, M Alsina, AR Blanch, M Cerda and J Jofre
Department of Microbiology, University of Barcelona, 08028 Barcelona, Spain

Methods for specific detection of Vibrio anguillarum in complex microbial communities within diverse marine aquaculture environments were evaluated. A system for the detection of culturable cells based on the combined use of a selective medium and a nonradioactively labeled oligodeoxynucleotide complementary to 16S rRNA was developed. Four hundred fourteen bacterial cultures were evaluated in order to assess the specificity of the method. When both the selective medium and the specific probe gave positive results, the cultures were always identified as V. anguillarum. The selectivity for colony hybridization was 1 V. anguillarum cell in 10,000 total bacterial cells in environmental samples. The utility of the method was also compared with detection by dot blot hybridization of either raw DNA purified from environmental samples or PCR-amplified DNA of 16S rRNA genes, using universal eubacterial primers. The post-PCR hybridization was more sensitive (8 x 10(sup2) cells) than direct hybridization of the whole purified DNA (10(sup6) cells). However, the selective medium-probe combined method was as sensitive as post-PCR hybridization, albeit more specific.

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