Rapid Proliferation of Vibrio parahaemolyticus, Vibrio vulnificus, and Vibrio cholerae during Freshwater Flash Floods in French Mediterranean Coastal Lagoons
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Published:2015-11
Issue:21
Volume:81
Page:7600-7609
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ISSN:0099-2240
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Container-title:Applied and Environmental Microbiology
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language:en
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Short-container-title:Appl Environ Microbiol
Author:
Esteves Kevin1, Hervio-Heath Dominique2, Mosser Thomas1, Rodier Claire1, Tournoud Marie-George1, Jumas-Bilak Estelle1, Colwell Rita R.3, Monfort Patrick1
Affiliation:
1. HydroSciences Montpellier, UMR 5569, CNRS, IRD, Université Montpellier, Montpellier, France 2. Ifremer, RBE, SG2M, Laboratoire Santé, Environnement et Microbiologie-LNR Microbiologie, Plouzané, France 3. Center for Bioinformatics and Computational Biology and Institute for Advanced Computer Studies, University of Maryland, College Park, Maryland, USA
Abstract
ABSTRACT
Vibrio parahaemolyticus
,
Vibrio vulnificus
, and
Vibrio cholerae
of the non-O1/non-O139 serotype are present in coastal lagoons of southern France. In these Mediterranean regions, the rivers have long low-flow periods followed by short-duration or flash floods during and after heavy intense rainstorms, particularly at the end of the summer and in autumn. These floods bring large volumes of freshwater into the lagoons, reducing their salinity. Water temperatures recorded during sampling (15 to 24°C) were favorable for the presence and multiplication of vibrios. In autumn 2011, before heavy rainfalls and flash floods, salinities ranged from 31.4 to 36.1‰ and concentrations of
V. parahaemolyticus
,
V. vulnificus
, and
V. cholerae
varied from 0 to 1.5 × 10
3
most probable number (MPN)/liter, 0.7 to 2.1 × 10
3
MPN/liter, and 0 to 93 MPN/liter, respectively. Following heavy rainstorms that generated severe flash flooding and heavy discharge of freshwater, salinity decreased, reaching 2.2 to 16.4‰ within 15 days, depending on the site, with a concomitant increase in
Vibrio
concentration to ca. 10
4
MPN/liter. The highest concentrations were reached with salinities between 10 and 20‰ for
V. parahaemolyticus
, 10 and 15‰ for
V. vulnificus
, and 5 and 12‰ for
V. cholerae
. Thus, an abrupt decrease in salinity caused by heavy rainfall and major flooding favored growth of human-pathogenic
Vibrio
spp. and their proliferation in the Languedocian lagoons. Based on these results, it is recommended that temperature and salinity monitoring be done to predict the presence of these
Vibrio
spp. in shellfish-harvesting areas of the lagoons.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
Reference58 articles.
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