Survival of <i>Escherichia coli</i> Strains in Mediterranean Brackish Water in the Bizerte Lagoon in Northern Tunisia

Boukef, I.; Bour, Monia El; Al-Gallas, Nazek; Bahri, Olfa; Mejri, Selma; Mraouna, R.; Aissa, Ridha Ben; Boudabous, A.; Got, Patrice; Troussellier, Marc

doi:10.2175/106143010x12609736967161

Cited by 7 publications

(2 citation statements)

References 59 publications

(62 reference statements)

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“…(1995), Lakhal (2003), El Mejri et al . (2008), Boukef et al . (2010) described changes in biochemical profiles for other species ( E. coli and Aeromonas spp.…”

Section: Discussionmentioning

confidence: 99%

INFLUENCE OF MARINE WATER CONDITIONS ON SALMONELLA ENTERICA SEROVAR TYPHIMURIUM SURVIVAL

Mejri

Bour

Boukef

et al. 2012

Journal of Food Safety

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Salmonella enterica serovar Typhimurium strains were isolated during a monitoring survey of the carpet shell clam (Ruditapes decussatus) collected from 23 stations along the Tunisian coast. The effect of starvation on Salmonella Typhimurium survival was investigated in vitro using microcosms composed of filtered (0.2 µm) marine water under dark and ambient temperature conditions (25C for 30 days). Eventual changes in physiological, biochemical properties, serotyping, biotyping and antimicrobial sensitivity for the environmentally adapted Salmonella Typhimurium were monitored. In response to stress conditions, the Salmonella Typhimurium strains progressively lost culturability in the absence of notable changes in the total cell count (during all the period of 30 days). Strains appeared to enter into a viable but noncultureable state as determined by epifluorescence method. We have also observed that the T90 value (time required for the reduction of 90% of cells) for the five different Salmonella strains ranged between 25 and 30 h; this indicated the survivability of Salmonella under stress conditions. This state was also characterized by biochemical and antimicrobial changes. PRACTICAL APPLICATION This research highlighted the acquisition of the viable but nonculturable state of bacteria. This form of adaptation of certain pathogens does not really reflect their presence or absence in the marine environment and thus in foods of marine origin. Hence the use of conventional methods of bacterial identification must be completed more advanced research tools before declaring a healthy product or environment.

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“…(1995), Lakhal (2003), El Mejri et al . (2008), Boukef et al . (2010) described changes in biochemical profiles for other species ( E. coli and Aeromonas spp.…”

Section: Discussionmentioning

confidence: 99%

INFLUENCE OF MARINE WATER CONDITIONS ON SALMONELLA ENTERICA SEROVAR TYPHIMURIUM SURVIVAL

Mejri

Bour

Boukef

et al. 2012

Journal of Food Safety

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“…In natural aquatic environments carbon availability and temperatures are much lower and therefore, the expected specific growth rates of enteric bacteria are lower (Berney et al, 2007). The occurrence of microorganisms in natural waters has been a subject of study in receptors such as rivers (Avery et al, 2008), lakes (Haller et al, 2009), estuarine waters (Chandran and Hatha, 2005;Kay et al, 2005), brackish water (Boukef et al, 2010) and seawater (Noble et al, 2004;Darakas et al, 2009), which indicate the aforementioned differentiated response.…”

Section: Introductionmentioning

confidence: 99%

Environmental considerations on solar disinfection of wastewater and the subsequent bacterial (re)growth

Giannakis

Darakas

Escalas-Cañellas

et al. 2015

Photochem Photobiol Sci

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In this work, solar disinfection of wastewater was studied, focused on the effect of selected environmental variables, namely, light intensity, continuous/intermittent light delivery, and post-irradiation storage as well as dilution in lake water. These variables were studied for their effect on disinfection efficiency and on post-irradiation survival/regrowth in undiluted wastewater and in wastewater diluted in lake water at different dilution rates. The bacterial inactivation curves were studied, and distinct kinetic phases were identified and interpreted. Dose primarily influenced the phases' demonstration and total inactivation times, independently from the irradiance. Intermittent illumination un-evenly prolonged the required exposure time and pointed to extended longer required illumination times when unstable weather conditions are to be expected. Post-irradiation survival/regrowth in undiluted wastewater showed three distinct kinetic profiles, with the transitions among them largely determined by the inflicted light dose.Lower doses resulted in similar inactivation profiles as high ones, when irradiation was followed by prolonged storage at high dilution rates in lake water. The studied factors show significant design and operation implications for solar wastewater applications, based on local environmental conditions and water receptor restrictions.

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Detection of Escherichia coli in Food Samples by Magnetosome-based Biosensor

Sannigrahi

Mathiyarasu

et al. 2023

Biotechnol Bioproc E

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

Cited by 7 publications

References 59 publications

INFLUENCE OF MARINE WATER CONDITIONS ON SALMONELLA ENTERICA SEROVAR TYPHIMURIUM SURVIVAL

INFLUENCE OF MARINE WATER CONDITIONS ON SALMONELLA ENTERICA SEROVAR TYPHIMURIUM SURVIVAL

Environmental considerations on solar disinfection of wastewater and the subsequent bacterial (re)growth

Detection of Escherichia coli in Food Samples by Magnetosome-based Biosensor

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