Legionella pneumophila Articles
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Legionnaires Disease and 2nd Generation ATP
As recent events in Quebec, Canada have shown, outbreaks of Legionnaire’s Disease continue to happen around the world. As our ability to diagnose this ailment improve, it is not surprising that the number of confirmed cases continues to rise. Conventional wisdom states that the bacteria responsible for this disease – Legionella pneumophila – have a tendency to grow in cooling ...
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Enumeration of Legionella pneumophila in cooling tower water systems
Legionella pneumophila, the causative agent of Legionnaires disease, is known to colonise and frequently grow in cooling tower waters. Disease is acquired by inhaling aerosol contaminated by legionellae. Determination of the count of Legionella pneumophila in cooling tower waters may, therefore, be useful for risk assessment. In our survey, 103 water samples from 50 cooling towers were examined ...
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Evaluation of a most probable number method for the enumeration of Legionella pneumophila from North American potable and nonpotable water samples
This study compares the performance of a novel most probable number (MPN) method (Legiolert™/Quanti-Tray®) with Standard Methods for the Examination of Water and Wastewater 9260 J for the enumeration of Legionella pneumophila from potable and nonpotable waters. Data from the study showed that Legiolert exhibited higher sensitivity for the detection of L. pneumophila for potable water and ...
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A New Field Method for Enumerating Viable Legionella And Total Heterotrophic Aerobic Bacteria
Presentation at the 2007 Association of Water Technologies Convention and Exposition ABSTRACT A new field method for the quantitative determination of viable Legionella and total heterotrophic aerobic bacteria was evaluated in hundreds of laboratory experiments and from analysis of over two thousand field samplers in actual operating conditions. The method has been proven reliable for ...
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Survival of pathogens in drinking water plumbing systems: impact factors and sanitation options
The objective was to determine impact factors that would allow Pseudomonas aeruginosa and Legionella pneumophila to survive sanitation measures of household drinking water systems. Therefore, different disinfectant concentrations were tested under different operating conditions in close-to-practice experiments. Particular attention was paid to the viable but non-culturable (VBNC) state of the ...
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Legionellosis Prevention in Industrial Equipment
Legionellosis is the most significant waterborne disease in the U.S. and possibly in many other developed countries with plumbing and other water handling systems. It accounted for about two-thirds of identified waterborne disease outbreaks included in the last two Centers for Disease Control and Prevention (CDC) “Mortality and Morbidity Weekly Reports” (MMWR) on drinking water, and ...
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Prevalence study of
Simkania negevensis in cooling towers in SpainSimkania negevensis is an obligate intracellular bacterium grouped into the order Chlamydiales. This new amoeba-resistant intracellular bacterium might represent a novel etiologic agent of bronchiolitis and community-acquired pneumonia and occurs in aquatic habitats such as drinking water and reclaimed wastewater. Another amoeba-related bacterium, Legionella pneumophila, is an etiologic agent of ...
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The importance of a dispersant in a Legionella Control Program
Outbreaks in Legionnaires’ Disease such as the one in the South Bronx of New York in August 2015 highlights the importance of having effective biofilm control as part of your overall industrial water treatment program. Colorized scanning electron micrograph (8000X) depicting a large grouping of Gram-negative Legionella pneumophila bacteria (Source: Centers for Disease Control). ...
By AMSA, Inc.
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Electrochemical inactivation kinetics of boron-doped diamond electrode on waterborne pathogens
A boron-doped diamond (BDD) electrode was constructed as a water disinfector for the inactivation of water borne pathogens. The bactericidal effect of the disinfector was evaluated on artificially contaminated waters containing, respectively, Escherichia coli, Pseudomonas aeruginosa and Legionella pneumophila at high density. By treating the bacterial suspensions with 4 V of constant voltage ...
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Amoebae and
Legionella pneumophila in saline environmentsAmoeboid protists that harbor bacterial pathogens are of significant interest as potential reservoirs of disease-causing organisms in the environment, but little is known about them in marine and other saline environments. We enriched amoeba cultures from sediments from four sites in the New England estuarine system of Mt. Hope Bay, Massachusetts and from sediments from six sites in the Great ...
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Legionnaire’s Disease and Pontiac Fever
Legionnaire’s Disease Caused by Legionella Pneumophila Legionnaire’s Disease is an environmentally transmitted disease caused by the Legionella Pneumophila bacteria that infect human hosts who breathe minute droplets of water that have been contaminated with the Legionella organism, a gram-negative bacterium. Legionella Pneumophila – the legionnaire’s disease bacteria ...
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Evidence Shows Need to Address Pathogenic Bacteria in U.S. Drinking Water Systems
Legionnaires’ disease is on the rise. Unfortunately, efforts to prevent Legionnaires’ disease to date have focused on building water systems rather than the municipal water supply. Building water systems are too far downstream to correct the problem, and, as a result, these efforts have been ineffective in curbing the incidence of legionellosis. It is unrealistic to place on building ...
By Evapco Inc.
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Legionella pneumophila serogroup 3 prevalence in drinking water survey in Israel (2003–2007)A 5-year survey (2003 to 2007) was carried out on various drinking water sources in Israel for detection of Legionella spp. The most frequently isolated species was L. pneumophila serogroup 3 (prevalence 60.44±5.6) followed by L. pneumophila serogroup 1 (26.98±5.2) and other serogroups and unidentified species (12.6±9.8). L. pneumophila serogroup 1 is the worldwide prevalent serogroup in water ...
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Removing Legionella pneumophila and biofilms from water supply systems using plant essential oils
Antibacterial and antibiofilm activities of sage (Salvia officinalis), thyme (Thymus vulgaris), peppermint (Mentha x piperita) and lemon (Citrus limonum) essential oils (EOs), supplied as commercial preparations, were investigated on Legionella pneumophila. Results showed that all EOs had antibacterial activity. Lemon oil demonstrated the best activity, with minimum inhibition concentration ...
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Legionnaire’s Disease: More Dangerous for Some
Legionnaire’s Disease is caused by Legionella Bacteria – more specifically Legionella pneumophila. The CDC reports that between 8,000 and 18,000 cases of Legionnaire’s Disease occur in the U.S. each year. The latest incident was in New York City in October 2018 when 29 cases were reported including 1 fatality. It is most dangerous to the very young and very old and those in ...
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Cooling Technology Institute - A new method to measure viable Legionella and total heterotrophic aerobic bacteria.
A new field method to measure viable Legionella and total heterotrophic aerobic bacteria was evaluated in the laboratory, in split-sample blinded comparisons and in actual operating field conditions. The method was proven reliable for determining viable cell concentrations of Legionella pneumophila serogroup 1, serogroups 2-14 and Legionella species. Total heterotrophic aerobic bacteria results ...
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Proteomic regulation during
Legionella pneumophila biofilm development: decrease of virulence factors and enhancement of response to oxidative stressLegionella pneumophila (L. pneumophila) is a Gram-negative bacterium, which can be found worldwide in aquatic environments. It tends to persist because it is often protected within biofilms or amoebae. L. pneumophila biofilms have a major impact on water systems, making the understanding of the bacterial physiological adaptation in biofilms a fundamental step towards their eradication. In this ...
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Sensitivity of
Vermamoeba (Hartmannella )vermiformis cysts to conventional disinfectants and proteaseVermamoeba vermiformis is a free-living amoeba (FLA) widely distributed in the environment, known to colonize hot water networks and to be the reservoir of pathogenic bacteria such as Legionella pneumophila. FLA are partly resistant to biocides, especially in their cyst form. The control of V. vermiformis in hot water networks represents an important health issue, but there are very few data on ...
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Legionella
Nomenclature Legionnaires' disease a pneumonia caused by any serogroup or sub-group of Legionella pneumophila Legionella pneumonia a pneumonia caused by any species of Legionella Pontiac Fever an acute, self-limiting, “flu-like” illness caused by certain species of Legionella Legionellosis any human disease caused by a species of Legionella ...
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Occurrence of Legionella in showers at recreational facilities
Critical environments, including water systems in recreational settings, represent an important source of Legionella pneumophila infection in humans. In order to assess the potential risk for legionellosis, we analyzed Legionella contamination of water distribution systems in 36 recreational facilities equipped with swimming pools. One hundred and sixty water samples were analyzed from shower ...
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