Prevalence of Biofilm Formation and Wide Distribution of Virulence Associated Genes among Vibrio spp. Strains Isolated from the Monastir Lagoon, Tunisia


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Polish Journal of Microbiology

Polish Society of Microbiologists

Subject: Microbiology


ISSN: 1733-1331
eISSN: 2544-4646





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VOLUME 65 , ISSUE 3 (August 2016) > List of articles

Prevalence of Biofilm Formation and Wide Distribution of Virulence Associated Genes among Vibrio spp. Strains Isolated from the Monastir Lagoon, Tunisia

Badreddine Mechri * / Amel Medhioub / Mohamed Nejib Medhioub / Mahjoub Aouni

Keywords : Vibrio spp., antibiotic susceptibility, biofilm, Monastir lagoon, virulence genes

Citation Information : Polish Journal of Microbiology. Volume 65, Issue 3, Pages 307-318, DOI:

License : (CC BY-NC-ND 4.0)

Received Date : 15-October-2014 / Accepted: 11-February-2016 / Published Online: 26-August-2016



In the current study, 65 Vibrio spp. were isolated from the Monastir lagoon water, were characterized phenotypically and genotypically. In addition, we looked for the presence of three Vibrio parahaemolyticus virulence genes (tlh, trh and tdh) and ten Vibrio cholerae virulence genes (ctxA, vpi, zot, ace, toxR, toxT, tosS, toxRS, tcpA and cpP). We also investigated the antibiotic susceptibilities and the adherence ability of the identified strains to abiotic material and to biotic surfaces. The cytotoxicity activity against HeLa and Vero cell lines were also carried out for all tested strains. All Vibrio isolates were identified to the species level and produced several hydrolytic exoenzymes. The results also revealed that all strains were expressing high rates of resistance to tested antibiotics. The minimum inhibitory concentration (MIC) values showed that tetracycline and chloramphenicol were the most effective antibiotics against the tested bacteria. Vibrio alginolyticus and V. cholerae species were the most adhesive strains to both biotic and abiotic surfaces. Besides, V. alginolyticus isolates has the high levels of recombination of genes encoding V. cholerae and V. parahaemolyticus virulence factors. In vitro cytotoxic activities of several Vibrio extracellular product were also observed among HeLa and Vero cells.

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