Co-occurrence of Free-living Amoebae and Amoebae-resisting Bacteria in Hospital Drinking Water System: Evaluation and Comparative Analysis

2016 ◽  
Vol 19 (2) ◽  
pp. 1-15
Author(s):  
Lamia Galal ◽  
Omnia El-Badawy ◽  
Mona Abdel-Rahim ◽  
Eman Mossad ◽  
Hanaa Bakir
Keyword(s):  
Drinking Water ◽  
Comparative Analysis ◽  
Water System ◽  
System Evaluation ◽  
Free Living ◽  
Drinking Water System

scholarly journals Cooccurrence of Five Pathogenic Legionella spp. and Two Free-Living Amoebae Species in a Complete Drinking Water System and Cooling Towers

Pathogens ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1407
Author(s):  
Alshae Logan-Jackson ◽  
Joan B. Rose
Keyword(s):  
Drinking Water ◽  
Legionella Pneumophila ◽  
Water Samples ◽  
Water System ◽  
Water Supply Systems ◽  
Cooling Towers ◽  
Free Living ◽  
Reservoir Water ◽  
Drinking Water System ◽  
Legionella Species

Pathogenic Legionella species grow optimally inside free-living amoebae to concentrations that increase risks to those who are exposed. The aim of this study was to screen a complete drinking water system and cooling towers for the occurrence of Acanthamoeba spp. and Naegleria fowleri and their cooccurrence with Legionella pneumophila, Legionella anisa, Legionella micdadei, Legionella bozemanii, and Legionella longbeachae. A total of 42 large-volume water samples, including 12 from the reservoir (water source), 24 from two buildings (influents to the buildings and exposure sites (taps)), and six cooling towers were collected and analyzed using droplet digital PCR (ddPCR). N. fowleri cooccurred with L. micdadei in 76 (32/42) of the water samples. In the building water system, the concentrations of N. fowleri and L. micdadei ranged from 1.5 to 1.6 Log10 gene copies (GC)/100 mL, but the concentrations of species increased in the cooling towers. The data obtained in this study illustrate the ecology of pathogenic Legionella species in taps and cooling towers. Investigating Legionella’s ecology in drinking and industrial waters will hopefully lead to better control of these pathogenic species in drinking water supply systems and cooling towers.

scholarly journals Influence of an Extended Domestic Drinking Water System on the Drinking Water Quality

Water ◽  
2018 ◽  
Vol 10 (5) ◽  
pp. 582 ◽  
Author(s):  
Ljiljana Zlatanović ◽  
Aleksandra Knezev ◽  
Jan van der Hoek ◽  
Jan Vreeburg
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Water System ◽  
Drinking Water Quality ◽  
Drinking Water System

Removal of N-nitrosamine precursors in drinking water system using adsorption methods

2015 ◽  
Vol 156 ◽  
pp. 972-979 ◽  
Author(s):  
Qihua Wu ◽  
Honglan Shi ◽  
Yinfa Ma ◽  
Craig Adams ◽  
Hua Jiang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water System ◽  
Drinking Water System

scholarly journals Exploring the relationships between small non-community drinking water system characteristics and water system performance in Ontario, Canada

2016 ◽  
Vol 14 (6) ◽  
pp. 998-1008
Author(s):  
Wendy Pons ◽  
Ian Young ◽  
David Pearl ◽  
Andria Jones-Bitton ◽  
Scott A. McEwen ◽  
...  
Keyword(s):  
Drinking Water ◽  
Ground Water ◽  
Water System ◽  
Low Risk ◽  
Assessment Process ◽  
E Coli ◽  
Drinking Water System ◽  
Training Opportunities ◽  
System Characteristics ◽  
Test Result

The objectives of this work were to investigate the relationships between characteristics of small non-community drinking water systems (SDWSs) and the performance of these systems with respect to Escherichia coli testing and risk ratings. Ontario-wide SDWS data were analysed using regression models with outcomes of (1) having an adverse E. coli test result in the 12 months prior to the last inspection and (2) the SDWS risk rating (high/medium vs. low risk) that is assigned by public health inspectors. Almost 34% (2,364/7,003) of SDWSs did not utilize treatment, more commonly for ground water than surface supplies (P < 0.001). The odds of having a positive E. coli test result were greater in systems using ground water with treatment (OR = 2.00; 95% CI 1.23–3.24) and surface water with treatment (OR = 1.97; 95% CI 1.05–3.71) compared to ground water with no treatment. The odds of having a water system rated high or medium compared to low risk was greater if the water system operated seasonally (OR = 1.36; 95% CI 1.17–1.59), had an adverse E. coli test result (OR = 1.66; 95% CI 1.09–2.53), and in specific facility types. This research helps to inform existing training opportunities available to SDWS operators in Ontario, and to better standardize the SDWS risk assessment process.

scholarly journals Microbiological water quality in a decentralized Arctic drinking water system

2020 ◽  
Vol 6 (7) ◽  
pp. 1855-1868
Author(s):  
Stephanie L. Gora ◽  
Tim Anaviapik Soucie ◽  
Nicole E. McCormick ◽  
C. Carolina Ontiveros ◽  
Vincent L'Hérault ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water System ◽  
Arctic Region ◽  
Water Source ◽  
Domestic Water ◽  
Point Of Use ◽  
System P ◽  
Drinking Water System ◽  
Microbiological Water Quality ◽  
Drinking Water Samples

Drinking water samples were collected from the water source, water delivery truck, domestic water storage tanks, and at the point of use in a decentralized drinking water system in Pond Inlet, Nunavut, a predominantly Inuit community in Canada's Arctic region.

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