Relative Inactivation of Faecal Indicator Bacteria and Sewage Markers in Freshwater and Seawater Microcosms

Warish Ahmed; P Gyawali; Jatinder P S Sidhu; S Toze

doi:10.1111/lam.12285

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Relative Inactivation of Faecal Indicator Bacteria and Sewage Markers in Freshwater and Seawater Microcosms

Journal article

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Relative Inactivation of Faecal Indicator Bacteria and Sewage Markers in Freshwater and Seawater Microcosms

Warish Ahmed, P Gyawali, Jatinder P S Sidhu and S Toze

Letters in Applied Microbiology, Vol.59(3), pp.348-354

2014

DOI: https://doi.org/10.1111/lam.12285

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Abstract

microbial source tracking

sewage pollution

inactivation

human adenoviruses

faecal indicator bacteria

microcosms

In this study, the relative inactivation of faecal indicator bacteria (FIB) namely Escherichia coli and enterococci and sewage markers [Bacteroides HF183 and human adenoviruses (HAVs)] were assessed in sewage spiked freshwater and seawater microcosms under ambient sub-tropical climatic conditions. The numbers of declining FIB were measured with culture-based methods whereas the numbers of sewage markers were measured with qPCR assays. The T90 inactivation times of E. coli, enterococci and the HF183 markers in both freshwater and seawater microcosms were less than 3.5 days suggesting the suitability of the HF183 marker to identify recent sewage pollution events. The T90 value of HAVs (9.4-13 days), however, was significantly higher than FIB and the HF183 marker in both freshwater (P less than 0.001) and seawater (P less than 0.05) microcosms. Therefore, we recommend that HAVs should be used as an additional marker in order to adequately assess the potential health risks associated with longer term sewage polluted environmental waters.

Details

Title: Relative Inactivation of Faecal Indicator Bacteria and Sewage Markers in Freshwater and Seawater Microcosms
Authors: Warish Ahmed (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
P Gyawali (Author) - University of Queensland
Jatinder P S Sidhu (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
S Toze (Author) - University of Queensland
Publication details: Letters in Applied Microbiology, Vol.59(3), pp.348-354
Publisher: Wiley-Blackwell Publishing Ltd.
Date published: 2014
DOI: 10.1111/lam.12285
ISSN: 0266-8254
Copyright note: Copyright © 2014 Wiley-Blackwell Publishing Ltd. This is the accepted version of the following article: Ahmed, W., Gyawali, P., Sidhu, J.P.S. and Toze, S. (2014), Relative inactivation of faecal indicator bacteria and sewage markers in freshwater and seawater microcosms. Letters in Applied Microbiology, 59: 348-354. doi: 10.1111/lam.12285, which has been published in final form at http://dx.doi.org/10.1111/lam.12285
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99448756902621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Biotechnology & Applied Microbiology; Microbiology

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