Detection and occurrence of indicator organisms and pathogens

Motlagh, Amir Mohaghegh; Yang, Zhengjian

doi:10.1002/wer.1238

Cited by 59 publications

(43 citation statements)

References 40 publications

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“…Worthwhile, the untreated culture of P. agglumerans was responding efficiently. Previously, Rhizobium has been used as an indicator organism to several toxic chemicals including metallothioneins that can bind to metals ions through the thiol group of its cysteine residues [49][50][51]. On the other side, Rhodotorula showed the potential remove ions of heavy metals [52].…”

Section: P Agglumerans Biofilm Formation and Bioelectrochemical Responses To Cr(vi) And Cd(ii)mentioning

confidence: 99%

Microbial Sensing and Removal of Heavy Metals: Bioelectrochemical Detection and Removal of Chromium(VI) and Cadmium(II)

et al. 2021

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The presence of inorganic pollutants such as Cadmium(II) and Chromium(VI) could destroy our environment and ecosystem. To overcome this problem, much attention was directed to microbial technology, whereas some microorganisms could resist the toxic effects and decrease pollutants concentration while the microbial viability is sustained. Therefore, we built up a complementary strategy to study the biofilm formation of isolated strains under the stress of heavy metals. As target resistive organisms, Rhizobium-MAP7 and Rhodotorula ALT72 were identified. However, Pontoea agglumerans strains were exploited as the susceptible organism to the heavy metal exposure. Among the methods of sensing and analysis, bioelectrochemical measurements showed the most effective tools to study the susceptibility and resistivity to the heavy metals. The tested Rhizobium strain showed higher ability of removal of heavy metals and more resistive to metals ions since its cell viability was not strongly inhibited by the toxic metal ions over various concentrations. On the other hand, electrochemically active biofilm exhibited higher bioelectrochemical signals in presence of heavy metals ions. So by using the two strains, especially Rhizobium-MAP7, the detection and removal of heavy metals Cr(VI) and Cd(II) is highly supported and recommended.

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Section: P Agglumerans Biofilm Formation and Bioelectrochemical Responses To Cr(vi) And Cd(ii)mentioning

confidence: 99%

Microbial Sensing and Removal of Heavy Metals: Bioelectrochemical Detection and Removal of Chromium(VI) and Cadmium(II)

et al. 2021

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“…Total coliform (TC) and fecal coliform (FC) densities are typically used as fecal pollution indicators because they are invariably present in the feces of humans and other warm‐blooded animals in large numbers, can be easily detected in highly diluted bodies of water (Barraza, 2018; Barrera, Fernández, Wong‐Chang, & Romero, 2013; Bhumbla, Majumdar, Jain, & Dalal, 2020), and can be used as a microbial surrogate for water quality monitoring (Motlagh & Yang, 2019). Therefore, the presence of these microorganisms is used to evaluate and monitor water quality (Wen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Coliform bacteria in San Pedro Lake, western Mexico

Ramos-Ramírez

Romero-Bañuelos

Jiménez-Ruíz

et al. 2020

Water Environment Research

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Urbanization, livestock activities, and rainfall are factors that contribute to the contamination of inland water. This study aimed to determine the spatial and temporal variability of total coliforms (TCs) and fecal coliforms (FCs) in the surface water of San Pedro Lake as well as the gills and skin of Nile tilapia (Oreochromis niloticus) cultivated in the lake. The study consisted of seasonal sampling during an annual cycle. Using the multiple‐tube fermentation technique, we quantified the microbial load of TCs in the lake and fish. The median of the TC and FC groups in surface water showed differences during the seasonal cycle, in which a significant correlation was observed between rainfall and bacterial load in the lake surface water. There was a significant seasonal difference between FCs and TCs in the gills as well as in skin FCs. Anthropogenic activities in the watershed combined with rainfall influence the bacterial load of San Pedro Lake. However, the water quality is still classified as excellent and uncontaminated according to Mexican regulations with lower FC values acceptable for higher FC values. In addition, the bacterial load in tilapia from San Pedro Lake does not pose a risk to human health. Practitioner points Watershed livestock activities combined with rainfall increase fecal matter pollution in specific areas of the lake. San Pedro Lake displays satisfactory quality for aquatic life. The median fecal coliform population in lake fish (gills and skin) differs by season.

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“…ESBL genes can be divided into 4 groups: TEM, SHV, OXA, and CTX-M types ( Bush and Jacoby, 2010 ); CTX-M type is the most prevalent of ESBLs described ( Rossolini et al, 2008 ; Bevan et al, 2017 ). Enterobacteriaceae members are the most common bacterial agents causing foodborne outbreaks associated with the consumption of fresh produce ( Cooper et al, 2007 ; Kilonzo-Nthenge et al, 2018 ; Al-Kharousi et al, 2019 ; McDaniel and Jadeja, 2019 ; Motlagh and Yang, 2019 ). Pathogenic E. coli is a key bacterium in foodborne illnesses, and commensal E. coli is a common indicator organism of fecal contamination in aquatic systems ( Edberg et al, 2000 ; Rochelle-Newall et al, 2015 ; Motlagh and Yang, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Extended-Spectrum Beta-Lactamase Producing-Escherichia coli Isolated From Irrigation Waters and Produce in Ecuador

et al. 2021

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In cities across the globe, the majority of wastewater – that includes drug resistant and pathogenic bacteria among other contaminants – is released into streams untreated. This water is often subsequently used for irrigation of pastures and produce. This use of wastewater-contaminated streams allows antibiotic-resistant bacteria to potentially cycle back to humans through agricultural products. In this study, we investigated the prevalence of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli isolated from produce and irrigation water across 17 provinces of Ecuador. A total of 117 vegetable samples, 119 fruit samples, and 38 irrigation water samples were analyzed. Results showed that 11% of the samples were positive for E. coli including 11 irrigation water samples (29%), and samples of 13 vegetables (11%), and 11 fruits (9%). Among the 165 E. coli isolates cultured, 96 (58%) had the ESBL phenotype, and 58% of ESBL producing E. coli came from irrigation water samples, 11% from vegetables, and 30% from fruits. The blaCTX–M–55, blaCTX–M 65, and blaCTX–M 15 genes were the most frequently found gene associated with the ESBL phenotype and coincided with the blaCTX–M alleles associated with human infections in Ecuador. Three isolates had the mcr-1 gene which is responsible for colistin resistance. This report provides evidence of the potential role of irrigation water in the growing antimicrobial resistance crisis in Ecuador.

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Detection and occurrence of indicator organisms and pathogens

Cited by 59 publications

References 40 publications

Microbial Sensing and Removal of Heavy Metals: Bioelectrochemical Detection and Removal of Chromium(VI) and Cadmium(II)

Microbial Sensing and Removal of Heavy Metals: Bioelectrochemical Detection and Removal of Chromium(VI) and Cadmium(II)

Coliform bacteria in San Pedro Lake, western Mexico

Extended-Spectrum Beta-Lactamase Producing-Escherichia coli Isolated From Irrigation Waters and Produce in Ecuador

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