Microbial risk assessment of dental unit water systems in general dental practice in Greece

2006 ◽  
Vol 54 (3) ◽  
pp. 269-273 ◽  
Author(s):  
A. Mavridou ◽  
J. Kamma ◽  
G. Mandilara ◽  
P. Delaportas ◽  
F. Komioti
Keyword(s):  
Risk Assessment ◽  
Legionella Pneumophila ◽  
Water Systems ◽  
Source Water ◽  
Dental Practice ◽  
Microbial Risk Assessment ◽  
Water Line ◽  
Microbial Risk ◽  
General Dental Practice ◽  
Mycobacterium Spp

Water was sampled from source water, the 3-in-1 syringe and the air rotor water line of dental unit water systems (DUWS) in general dental practice in Attica, Greece. A section of the water line supplying the 3-in-1 syringe was cut for biofilm analysis. High total viable counts, Mycobacterium spp. and Pseudomonas aeruginosa were detected in the samples. Back siphonage was evidenced by the presence of blood and the recovery of oral anaerobes from the samples. Legionella pneumophila was recovered from 16.1% of biofilm samples. All tested disinfectants reduced the total viable counts of the DUWS to <100 CFU/mL.

scholarly journals Microbial risk assessment of drinking water based on hydrodynamic modelling of pathogen concentrations in source water

2015 ◽  
Vol 526 ◽  
pp. 177-186 ◽  
Author(s):  
Ekaterina Sokolova ◽  
Susan R. Petterson ◽  
Olaf Dienus ◽  
Fredrik Nyström ◽  
Per-Eric Lindgren ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Drinking Water ◽  
Source Water ◽  
Hydrodynamic Modelling ◽  
Microbial Risk Assessment ◽  
Microbial Risk ◽  
Water Based

Critical review of mathematical approaches for quantitative microbial risk assessment (QMRA) of Legionella in engineered water systems: research gaps and a new framework

2016 ◽  
Vol 2 (4) ◽  
pp. 599-613 ◽  
Author(s):  
K. A. Hamilton ◽  
C. N. Haas
Keyword(s):  
Risk Assessment ◽  
Disease Outbreaks ◽  
The United States ◽  
Water Systems ◽  
Quantitative Microbial Risk Assessment ◽  
Research Gaps ◽  
Microbial Risk Assessment ◽  
Microbial Risk ◽  
Systems Research ◽  
New Framework

Legionellahas been identified as the responsible agent for two-thirds of waterborne disease outbreaks in the United States from 2011–2012.

scholarly journals Assessment of source water pathogen contamination

2007 ◽  
Vol 5 (S1) ◽  
pp. 39-50 ◽  
Author(s):  
Magali Dechesne ◽  
Emmanuel Soyeux
Keyword(s):  
Risk Assessment ◽  
Pathogen Detection ◽  
Detection Methods ◽  
Quality Data ◽  
Great Effort ◽  
Source Water ◽  
Quantitative Microbial Risk Assessment ◽  
Microbial Risk Assessment ◽  
Microbial Risk ◽  
Faecal Indicators

During the last decade, the source to tap risk-based approach to pathogens in drinking water has been largely promoted. This paper addresses the issue of source water pathogen contamination, which is the first step of quantitative microbial risk assessment. It is focused on a selection of pathogens considered to be a major risk to human health. Source water quality is highly variable and understanding the reasons for this variability is important as it will influence the requirements for treatment, treatment efficiency and the resulting health risk associated with the finished water. A framework for source water microbial quality assessment based on catchment surveys and monitoring programmes was set and tested on ten water sources. The monitoring programmes included faecal indicators and pathogens, during both baseline and hazardous event conditions. Concentrations varied greatly within and between systems. Faecal indicators were shown to be poor surrogates for pathogen presence and concentrations. There was no recurring evidence that the pathogens correlated together and links between microbial parameters appeared to be very site specific. Such variability between systems shows the importance of running local monitoring programs for use in risk assessment. Finally, pathogen detection methods are not yet optimal due to their sensitivity and to the lack of knowledge on viability and infectivity of pathogens. A great effort needs to be made in the future to ensure better quality data as this may have large implications in the statistical risk assessment calculations.

scholarly journals Use of microbial risk assessment to inform the national estimate of acute gastrointestinal illness attributable to microbes in drinking water

2006 ◽  
Vol 4 (S2) ◽  
pp. 165-186 ◽  
Author(s):  
Jeffrey A. Soller
Keyword(s):  
Risk Assessment ◽  
Drinking Water ◽  
Distribution Systems ◽  
The United States ◽  
Water Systems ◽  
Gastrointestinal Illness ◽  
Microbial Risk Assessment ◽  
Microbial Risk ◽  
Acute Gastrointestinal Illness ◽  
Treated Drinking Water

Microbial risk assessment (MRA) evaluates the likelihood of adverse human health effects that occur following exposure to pathogenic microorganisms. This paper focuses on the potential use of MRA to provide insight to the national estimate of acute gastrointestinal illness (AGI) in the United States among persons served by public water systems. This article defines MRA, describes how MRA is implemented, provides an overview of the field of MRA and discusses how MRA may be useful for characterizing the national estimate. Communities served by drinking water systems with relatively contaminated source waters, sub-standard treatment facilities, and/or contamination problems in their distribution systems are subject to higher risks than communities where such issues are less of a concern. Further, the risk of illness attributable to pathogens in drinking water in each community can be thought of as the sum of the risk from the treated drinking water and the risk from the distribution system. Pathogen-specific MRAs could be developed to characterize the risk associated with each of these components; however, these assessments are likely to under-estimate the total risk from all pathogens attributable to drinking water. Potential methods for developing such MRAs are discussed along with their associated limitations.

Evaluation of Microbial Risk Assessment Techniques and Applications

2015 ◽  
Vol 3 (0) ◽  
pp. 9781780404141-9781780404141
Author(s):  
J. A. Soller ◽  
A. W. Olivieri ◽  
J. N. S. Eisenberg ◽  
R. Sakajii ◽  
R. Danielson
Keyword(s):  
Risk Assessment ◽  
Microbial Risk Assessment ◽  
Microbial Risk ◽  
Assessment Techniques

Enteric virus presence in green vegetables and associated irrigation waters in a rural area from Argentina. A quantitative microbial risk assessment

LWT ◽  
2021 ◽  
Vol 144 ◽  
pp. 111201 ◽  
Author(s):  
Prez Verónica Emilse ◽  
Victoria Matías ◽  
Martínez Laura Cecilia ◽  
Giordano Miguel Oscar ◽  
Masachessi Gisela ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Rural Area ◽  
Enteric Virus ◽  
Quantitative Microbial Risk Assessment ◽  
Microbial Risk Assessment ◽  
Microbial Risk ◽  
Irrigation Waters
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