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1. A review on microbial contaminants in stormwater runoff and outfalls: Potential health risks and mitigation strategies

Author:
Ahmed, Warish,   et al.   ; Hamilton, Kerry; Toze, Simon; Cook, Stephen; Page, Declan;     Show all 5 Authors
Source:
The Science of the total environment 2019 v.692 pp. 1304-1321
ISSN:
0048-9697
Subject:
best management practices; climate change; energy; genetic markers; groundwater; industry; microbial contamination; microbiological risk assessment; models; pathogens; public health; rain; risk; risk management; sewage treatment; stormwater; trade; urbanization; water reuse; water supply
Abstract:
... Demands on global water supplies are increasing in response to the need to provide more food, water, and energy for a rapidly growing population. These water stressors are exacerbated by climate change, as well as the growth and urbanisation of industry and commerce. Consequently, urban water authorities around the globe are exploring alternative water sources to meet ever-increasing demands. Thes ...
DOI:
10.1016/j.scitotenv.2019.07.055

2. Marker genes of fecal indicator bacteria and potential pathogens in animal feces in subtropical catchments

Author:
Ahmed, Warish,   et al.   ; O'Dea, Christian; Masters, Nicole; Kuballa, Anna; Marinoni, Oswald; Katouli, Mohammad;     Show all 6 Authors
Source:
The Science of the total environment 2019 v.656 pp. 1427-1435
ISSN:
0048-9697
Subject:
Campylobacter; Cryptosporidium parvum; Enterococcus; Escherichia coli; Giardia lamblia; Macropus giganteus; Mycobacterium avium complex; Pteropodidae; Salmonella; cattle; chickens; dogs; feces; genetic markers; humans; indicator species; pathogens; quantitative polymerase chain reaction; risk assessment; swine; watersheds; wild animals
Abstract:
... We investigated the abundance of marker genes of two fecal indicator bacteria (FIB) and eight potential pathogens in fecal samples of humans (n = 14) and 10 domestic and native wild animals (n = 134). For each target animal, between 10 and 14 individual fecal samples were collected (n = 148 individual fecal samples in total). The abundance of FIB and potential pathogens within each sample was dete ...
DOI:
10.1016/j.scitotenv.2018.11.439

3. Synergy between quantitative microbial source tracking (qMST) and quantitative microbial risk assessment (QMRA): A review and prospectus

Author:
Ahmed, Warish,   et al.   ; Zhang, Qian; Gallard, Javier; Wu, Baolei; Harwood, Valerie J.; Sadowsky, Michael J.; Hamilton, Kerry A.;     Show all 7 Authors
Source:
Environment international 2019 v.130 pp. 104703
ISSN:
0160-4120
Subject:
environmental factors; genetic markers; host specificity; indicator species; microbiological risk assessment; microorganisms; models; monitoring; nucleic acids; pathogens; primary contact; risk; risk management; surface water
Abstract:
... The use of microbial source tracking (MST) marker genes has grown in recent years due to the need to attribute point and non-point fecal contamination to specific sources. Quantitative microbial risk assessment (QMRA) is a modeling approach used to estimate health risks from exposure to feces-contaminated water and associated pathogens. A combination of these approaches [quantitative MST (qMST) an ...
DOI:
10.1016/j.envint.2019.03.051

4. Microfluidic quantification of multiple enteric and opportunistic bacterial pathogens in roof-harvested rainwater tank samples

Author:
Ahmed, Warish,   et al.   ; Zhang, Qian; Ishii, Satoshi; Hamilton, Kerry; Haas, Charles;     Show all 5 Authors
Source:
Environmental monitoring and assessment 2018 v.190 no.2 pp. 105
ISSN:
0167-6369
Subject:
Legionella pneumophila; Shigella; bacteria; genes; human health; indicator species; pathogens; public health; quantitative polymerase chain reaction; rain; risk; water shortages
Abstract:
... Potable and non-potable uses of roof-harvested rainwater (RHRW) are increasing due to water shortages. To protect human health risks, it is important to identify and quantify disease-causing pathogens in RHRW so that appropriate treatment options can be implemented. We used a microfluidic quantitative PCR (MFQPCR) system for the quantitative detection of a wide array of fecal indicator bacteria (F ...
DOI:
10.1007/s10661-018-6482-0

5. Decay of sewage-associated bacterial communities in fresh and marine environmental waters and sediment

Author:
Ahmed, Warish,   et al.   ; Staley, Christopher; Kaiser, Thomas; Sadowsky, Michael J.; Kozak, Sonya; Beale, David; Simpson, Stuart;     Show all 7 Authors
Source:
Applied microbiology and biotechnology 2018 v.102 no.16 pp. 7159-7170
ISSN:
0175-7598
Subject:
DNA; bacterial communities; community structure; decision making; freshwater; guidelines; human health; microbiological quality; pathogens; risk; sediments; sewage; water quality; Queensland
Abstract:
... Understanding the microbial quality of recreational waters is critical to effectively managing human health risks. In recent years, the development of new molecular methods has provided scientists with alternatives to the use of culture-based fecal indicator methods for investigating sewage contamination in recreational waters. Before these methods can be formalized into guidelines, however, we mu ...
DOI:
10.1007/s00253-018-9112-4

6. Abundance of Naegleria fowleri in roof-harvested rainwater tank samples from two continents

Author:
Ahmed, Warish,   et al.   ; Waso, Monique; Dobrowsky, PenelopeHeather; Hamilton, KerryAnn; Puzon, Geoffrey; Miller, Haylea; Khan, Wesaal;     Show all 7 Authors
Source:
Environmental science and pollution research international 2018 v.25 no.6 pp. 5700-5710
ISSN:
0944-1344
Subject:
Enterococcus; Escherichia coli; Naegleria fowleri; dose response; genes; indicator species; microbiological risk assessment; models; nitrogen content; pathogens; public health; quantitative polymerase chain reaction; rain; risk; secondary infection; Queensland; South Africa
Abstract:
... Roof-harvested rainwater (RHRW) has been used as an alternative source of water in water scarce regions of many countries. The microbiological and chemical quality of RHRW has been questioned due to the presence of bacterial and protozoan pathogens. However, information on the occurrence of pathogenic amoeba in RHRW tank samples is needed due to their health risk potential and known associations w ...
DOI:
10.1007/s11356-017-0870-9

7. Human health risks for Legionella and Mycobacterium avium complex (MAC) from potable and non-potable uses of roof-harvested rainwater

Author:
Ahmed, Warish,   et al.   ; Hamilton, Kerry A.; Toze, Simon; Haas, Charles N.;     Show all 4 Authors
Source:
Water research 2017 v.119 pp. 288-303
ISSN:
0043-1354
Subject:
Legionella pneumophila; Mycobacterium avium complex; aerosols; breathing; children; clothing; drinking; drinking water; exposure pathways; gardens; human health; irrigation; lettuce; lymphadenitis; microbiological risk assessment; pathogens; rain; risk; risk management; swimming; washing; Queensland
Abstract:
... A quantitative microbial risk assessment (QMRA) of opportunistic pathogens Legionella pneumophila (LP) and Mycobacterium avium complex (MAC) was undertaken for various uses of roof-harvested rainwater (RHRW) reported in Queensland, Australia to identify appropriate usages and guide risk management practices. Risks from inhalation of aerosols due to showering, swimming in pools topped up with RHRW, ...
DOI:
10.1016/j.watres.2017.04.004

8. Amplicon-based profiling of bacteria in raw and secondary treated wastewater from treatment plants across Australia

Author:
Ahmed, Warish,   et al.   ; Staley, Christopher; Sidhu, Jatinder; Sadowsky, Michael; Toze, Simon;     Show all 5 Authors
Source:
Applied microbiology and biotechnology 2017 v.101 no.3 pp. 1253-1266
ISSN:
0175-7598
Subject:
ABC transporters; Arcobacter; Bacteroides; Pseudomonas; antibiotic resistance; bacteria; bacterial communities; community structure; genes; genetic resistance; high-throughput nucleotide sequencing; human health; monitoring; municipal wastewater; pathogens; phenotype; ribosomal RNA; wastewater treatment; Australia
Abstract:
... In this study, we investigated the use of Illumina high-throughput sequencing of 16S ribosomal RNA (rRNA) amplicons to explore microbial diversity and community structure in raw and secondary treated wastewater (WW) samples from four municipal wastewater treatment plants (WWTPs A–D) across Australia. Sequence reads were analyzed to determine the abundance and diversity of bacterial communities in ...
DOI:
10.1007/s00253-016-7959-9

9. Quantitative microbial risk assessment of microbial source tracking markers in recreational water contaminated with fresh untreated and secondary treated sewage

Author:
Ahmed, Warish,   et al.   ; Hamilton, Kerry A.; Lobos, Aldo; Hughes, Bridie; Staley, Christopher; Sadowsky, Michael J.; Harwood, Valerie J.;     Show all 7 Authors
Source:
Environment international 2018 v.117 pp. 243-249
ISSN:
0160-4120
Subject:
Adenoviridae; Bacteroides; Methanobrevibacter smithii; Norovirus; Pepper mild mottle virus; Polyomavirus; feces; gastrointestinal system; genes; human health; humans; microbiological risk assessment; models; nucleic acids; pathogens; quantitative polymerase chain reaction; risk; sewage; sewage treatment; swimming; water quality
Abstract:
... Microbial source tracking (MST) methods have provided the means to identify sewage contamination in recreational waters, but the risk associated with elevated levels of MST targets such as sewage-associated Bacteroides HF183 and other markers is uncertain. Quantitative microbial risk assessment (QMRA) modeling allows interpretation of MST data in the context of the risk of gastrointestinal (GI) il ...
DOI:
10.1016/j.envint.2018.05.012

10. Precipitation influences pathogenic bacteria and antibiotic resistance gene abundance in storm drain outfalls in coastal sub-tropical waters

Author:
Ahmed, Warish,   et al.   ; Zhang, Qian; Lobos, Aldo; Senkbeil, Jacob; Sadowsky, Michael J.; Harwood, Valerie J.; Saeidi, Nazanin; Marinoni, Oswald; Ishii, Satoshi;     Show all 9 Authors
Source:
Environment international 2018 v.116 pp. 308-318
ISSN:
0160-4120
Subject:
Bacteroides; Enterococcus; Escherichia coli; antibiotic resistance genes; aquatic ecosystems; bacteria; carbapenems; genetic markers; humans; indicator species; infrastructure; intimin; microbial contamination; pathogens; quantitative polymerase chain reaction; sewage; storms; stormwater; virulence; viruses; Florida
Abstract:
... Stormwater contamination can threaten the health of aquatic ecosystems and human exposed to runoff via nutrient and pathogen influxes. In this study, the concentrations of 11 bacterial pathogens and 47 antibiotic resistance genes (ARGs) were determined by using high-throughput microfluidic qPCR (MFQPCR) in several storm drain outfalls (SDOs) during dry and wet weather in Tampa Bay, Florida, USA. D ...
DOI:
10.1016/j.envint.2018.04.005

11. Optimization of sampling strategy to determine pathogen removal efficacy of activated sludge treatment plant

Author:
Ahmed, Warish,   et al.   ; Sidhu, Jatinder P. S.; Palmer, Andrew; Smith, Kylie; Hodgers, Leonie; Toze, Simon;     Show all 6 Authors
Source:
Environmental science and pollution research international 2017 v.24 no.23 pp. 19001-19010
ISSN:
0944-1344
Subject:
Adenoviridae; Escherichia coli; Microviridae; Norovirus; Polyomavirus; Rotavirus; activated sludge; bacteriophages; humans; pathogens; t-test; wastewater
Abstract:
... Large-scale wastewater schemes rely on multi-barrier approach for the production of safe and sustainable recycled water. In multi-barrier wastewater reclamation systems, conventional activated sludge process (ASP) often constitutes a major initial treatment step. The main aim of this research was to determine most appropriate sampling approach to establish pathogen removal efficacy of ASP. The res ...
DOI:
10.1007/s11356-017-9557-5

12. Seasonal Assessment of Opportunistic Premise Plumbing Pathogens in Roof-Harvested Rainwater Tanks

Author:
Ahmed, Warish,   et al.   ; Hamilton, Kerry A.; Palmer, Andrew; Smith, Kylie; Toze, Simon; Haas, Charles N.;     Show all 6 Authors
Source:
Environmental Science & Technology 2017 v.51 no.3 pp. 1742-1753
ISSN:
1520-5851
Subject:
Acanthamoeba; Enterococcus; Escherichia coli; Legionella pneumophila; Mycobacterium avium; Mycobacterium intracellulare; dry season; indicator species; microbiological risk assessment; pathogens; quantitative polymerase chain reaction; rain; risk; surveys; tanks; wet season
Abstract:
... A seasonal study on the occurrence of six opportunistic premise plumbing pathogens (OPPPs) in 24 roof-harvested rainwater (RHRW) tanks repeatedly sampled over six monthly sampling events (n = 144) from August 2015 to March 2016 was conducted using quantitative qPCR. Fecal indicator bacteria (FIB) Escherichia coli (E. coli) and Enterococcus spp. were enumerated using culture-based methods. All tank ...
DOI:
10.1021/acs.est.6b04814