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Salmonella enterica Serovar Typhimurium and Escherichia coli Survival in Estuarine Bank Sediments

Author

Listed:
  • Mahbubul H. Siddiqee

    (Environmental and Public Health Microbiology Laboratory (EPHM LAB), Department of Civil Engineering, Monash University, Melbourne, VIC-3168, Australia
    Molecular and Environmental Microbiology Laboratory (MEM LAB), Department of Mathematics and Natural Sciences, BRAC University, Dhaka 1212, Bangladesh)

  • Rebekah Henry

    (Environmental and Public Health Microbiology Laboratory (EPHM LAB), Department of Civil Engineering, Monash University, Melbourne, VIC-3168, Australia)

  • Rebecca Coulthard

    (Environmental and Public Health Microbiology Laboratory (EPHM LAB), Department of Civil Engineering, Monash University, Melbourne, VIC-3168, Australia)

  • Christelle Schang

    (Environmental and Public Health Microbiology Laboratory (EPHM LAB), Department of Civil Engineering, Monash University, Melbourne, VIC-3168, Australia)

  • Richard Williamson

    (Environmental and Public Health Microbiology Laboratory (EPHM LAB), Department of Civil Engineering, Monash University, Melbourne, VIC-3168, Australia)

  • Rhys Coleman

    (Melbourne Water Corporation, Docklands, VIC-3008, Australia)

  • Graham Rooney

    (Melbourne Water Corporation, Docklands, VIC-3008, Australia)

  • Ana Deletic

    (Environmental and Public Health Microbiology Laboratory (EPHM LAB), Department of Civil Engineering, Monash University, Melbourne, VIC-3168, Australia)

  • David McCarthy

    (Environmental and Public Health Microbiology Laboratory (EPHM LAB), Department of Civil Engineering, Monash University, Melbourne, VIC-3168, Australia)

Abstract

Estuarine bank sediments have the potential to support the survival and growth of fecal indicator organisms, including Escherichia coli . However, survival of fecal pathogens in estuarine sediments is not well researched and therefore remains a significant knowledge gap regarding public health risks in estuaries. In this study, simultaneous survival of Escherichia coli and a fecal pathogen, Salmonella enterica serovar Typhimurium, was studied for 21 days in estuarine bank sediment microcosms. Observed growth patterns for both organisms were comparable under four simulated scenarios; for continuous-desiccation, extended-desiccation, periodic-inundation, and continuous-inundation systems, logarithmic decay coefficients were 1.54/day, 1.51/day, 0.14/day, and 0.20/day, respectively, for E. coli , and 1.72/day, 1.64/day, 0.21/day, and 0.24/day for S. Typhimurium. Re-wetting of continuous-desiccated systems resulted in potential re-growth, suggesting survival under moisture-limited conditions. Key findings from this study include: (i) Bank sediments can potentially support human pathogens ( S. Typhimurium), (ii) inundation levels influence the survival of fecal bacteria in estuarine bank sediments, and (iii) comparable survival rates of S. Typhimurium and E. coli implies the latter could be a reliable fecal indicator in urban estuaries. The results from this study will help select suitable monitoring and management strategies for safer recreational activities in urban estuaries.

Suggested Citation

  • Mahbubul H. Siddiqee & Rebekah Henry & Rebecca Coulthard & Christelle Schang & Richard Williamson & Rhys Coleman & Graham Rooney & Ana Deletic & David McCarthy, 2018. "Salmonella enterica Serovar Typhimurium and Escherichia coli Survival in Estuarine Bank Sediments," IJERPH, MDPI, vol. 15(11), pages 1-13, November.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:11:p:2597-:d:184310
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