Survival of "Escherichia coli" Strains in Mediterranean Brackish Water in the Bizerte Lagoon in Northern Tunisia

This study investigated survival and virulence of Escherichia coli strains exposed to natural conditions in brackish water. Two E. coli strains (O126:B16 and O55:B5) were incubated in water microcosms in the Bizerte lagoon in Northern Tunisia and exposed for 12 days to natural sunlight in June (231...

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Published in:Water environment research 2010-11, Vol.82 (11), p.2249-2257
Main Authors: Boukef, I., Bour, M. El, Gallas, N. Al, Bahri, O. El, Mejri, S., Mraouna, R., Aissa, R. Ben, Boudabous, A., Got, P., Troussellier, M.
Format: Article
Language:English
Subjects:
Applied sciences
Bacteria
Bizerte lagoon
Brackish
Brackish water
Carbohydrates
Cell membranes
Cultured cells
Cytotoxicity
E coli
Ecosystems
Enterobacteriaceae
Environmental Monitoring
Escherichia coli
Escherichia coli - physiology
Exact sciences and technology
Fermentation
Laboratories
Lagoons
Life Sciences
Mediterranean Sea
Microcosms
Pollution
Radiation
Salinity
Sea water
Seawater
Sunlight
survival
Time Factors
Tunisia
Virulence
Water - chemistry
Water Microbiology
Water Pollutants
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creator Boukef, I.
Bour, M. El
Gallas, N. Al
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Boudabous, A.
Got, P.
Troussellier, M.
description This study investigated survival and virulence of Escherichia coli strains exposed to natural conditions in brackish water. Two E. coli strains (O126:B16 and O55:B5) were incubated in water microcosms in the Bizerte lagoon in Northern Tunisia and exposed for 12 days to natural sunlight in June (231 to 386 W/m², 26 ± 1 °C, 30 g/L) and in April (227 to 330 W/m², 17 ± 1 °C, 27 g/L) or maintained in darkness for 21 days (17 ± 1 °C, 27 g/L). The results revealed that sunlight was the most significant inactivating factor (decrease of 3 Ulog within 48 hours for the two strains) compared to salinity and temperature (in darkness). Survival time of the strains was prolonged as they were maintained in darkness. Local strain (E. coli O55:B5) showed better survival capacity (T₉₀ = 52 hours) than E. coli O126:B16 (T₉₀ = 11 h). For both, modifications were noted only for some metabolic activities of carbohydrates hydrolysis. Cytotoxicity of the two strains, tested on Vero cell, was maintained during the period of survival.
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source Wiley-Blackwell Read & Publish Collection; JSTOR Archival Journals
subjects Applied sciences
Bacteria
Bizerte lagoon
Brackish
Brackish water
Carbohydrates
Cell membranes
Cultured cells
Cytotoxicity
E coli
Ecosystems
Enterobacteriaceae
Environmental Monitoring
Escherichia coli
Escherichia coli - physiology
Exact sciences and technology
Fermentation
Laboratories
Lagoons
Life Sciences
Mediterranean Sea
Microcosms
Pollution
Radiation
Salinity
Sea water
Seawater
Sunlight
survival
Time Factors
Tunisia
Virulence
Water - chemistry
Water Microbiology
Water Pollutants
title Survival of "Escherichia coli" Strains in Mediterranean Brackish Water in the Bizerte Lagoon in Northern Tunisia
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