Influence of amoebae and physical and chemical characteristics of water on presence and proliferation of Legionella species in hospital water systems

Lashéras, A.; Boulestreau, H.; Rogues, Anne-Marie; Ohayon-Courtès, Céline; Labadie, Jean-Claude; Gachie, J.P.

doi:10.1016/j.ajic.2006.03.007

Cited by 59 publications

(38 citation statements)

References 19 publications

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“…While temperature is known to be a critical factor for controlling opportunistic pathogen occurrence (30,34,42,52,55), no correlation between Legionella or mycobacteria and temperature was observed in this study. This was not unexpected, because temperature typically elicits a threshold response at extremes and the temperatures captured in this study were not necessarily representative of the narrow range corresponding to a linear growth rate response.…”

Section: Discussioncontrasting

confidence: 37%

“…On the other hand, some waterborne opportunistic pathogens, such as M. avium complex, are slow-growing oligotrophs capable of resisting heat and disinfectants, which makes them strong competitors in the drinking water environment (31). The occurrence of Legionella and mycobacteria in premise plumbing and potential relationships of occurrence with environmental factors, such as water chemistry (6,9,33,72), temperature (30,34,42,52,55), water heater capacity and type (48,55), and premise plumbing characteristics (52), have been previously reported. Water heater temperature is considered to be the most critical determining factor for Legionella and NTM colonization in household plumbing (30,34,42,52,55).…”

mentioning

confidence: 99%

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Molecular Survey of the Occurrence of Legionella spp., Mycobacterium spp., Pseudomonas aeruginosa, and Amoeba Hosts in Two Chloraminated Drinking Water Distribution Systems

Wang

Edwards

Falkinham

et al. 2012

Appl Environ Microbiol

252

230

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ABSTRACTThe spread of opportunistic pathogens via public water systems is of growing concern. The purpose of this study was to identify patterns of occurrence among three opportunistic pathogens (Legionella pneumophila,Mycobacterium avium, andPseudomonas aeruginosa) relative to biotic and abiotic factors in two representative chloraminated drinking water distribution systems using culture-independent methods. Generally, a high occurrence ofLegionella(≥69.0%) and mycobacteria (100%), lower occurrence ofL. pneumophila(≤20%) andM. avium(≤33.3%), and rare detection ofPseudomonas aeruginosa(≤13.3%) were observed in both systems according to quantitative PCR. Also,Hartmanella vermiformiswas more prevalent thanAcanthamoeba, both of which are known hosts for opportunistic pathogen amplification, the latter itself containing pathogenic members. Three-minute flushing served to distinguish distribution system water from plumbing in buildings (i.e., premise plumbing water) and resulted in reduced numbers of copies ofLegionella, mycobacteria,H. vermiformis, and 16S rRNA genes (P< 0.05) while yielding distinct terminal restriction fragment polymorphism (T-RFLP) profiles of 16S rRNA genes. Within certain subgroups of samples, some positive correlations, including correlations of numbers of mycobacteria and total bacteria (16S rRNA genes),H. vermiformisand total bacteria, mycobacteria andH. vermiformis, andLegionellaandH. vermiformis, were noted, emphasizing potential microbial ecological relationships. Overall, the results provide insight into factors that may aid in controlling opportunistic pathogen proliferation in real-world water systems.

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Section: Discussioncontrasting

confidence: 37%

mentioning

confidence: 99%

Molecular Survey of the Occurrence of Legionella spp., Mycobacterium spp., Pseudomonas aeruginosa, and Amoeba Hosts in Two Chloraminated Drinking Water Distribution Systems

Wang

Edwards

Falkinham

et al. 2012

Appl Environ Microbiol

252

230

View full text Add to dashboard Cite

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“…This agrees with the fact that Legionella optimal temperature range between 25 and 45°C (Arvand et al, 2011). Both Zanetti et al (2000) and Rakić et al (2012), found that temperature had a significant impact on Legionella counts, while Lasheras et al (2006), determined that temperature is not a strong factor affecting Legionella presence in water.…”

Section: Correlations Of Legionella With Other Quality Parametersmentioning

confidence: 93%

Legionella pneumophila: From potable water to treated greywater; quantification and removal during treatment

Blanky

Rodríguez-Martínez

Halpern

et al. 2015

Science of The Total Environment

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“…A study evaluating factors associated with colonization of hospital water supply systems by Legionella spp. showed a statistically significant association between the presence of amoebae in potable water and Legionella colonization [43]. However, there was no correlation between concentrations of Legionella and the presence of amoebae [40].…”

Section: Ecologymentioning

confidence: 85%

Nosocomial Legionnaires’ Disease: Risque and Prevention

Tai¹,

Benchekroun²,

Ennaji³

et al. 2012

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In 1977, Fraser et al. described an outbreak of pneumonia among legionnaires attending a convention at a hotel in Philadelphia in 1976. Legionnaires' disease (LD) can be nosocomial, community acquired or travel related. The incidence of hospital-acquired legionellosis appears to be increasing. Colonization of water systems by Legionella spp. is ubiquitous in hospitals throughout the world. The outbreak, which later became known as legionnaires' disease, was caused by a new pleomorphic, faintly staining gram-negative bacillus, L. pneumophila, which was isolated at the Center for Disease Control from lung tissues of legionnaires who died. Risk assessment for this disease forms the basis for the institution of control measures. Detection and quantification of Legionella spp. in the environment, in particular in the hospital water distribution system is one of the cornerstones of risk assessment. This review summarizes the current state-of-the-art regarding these aspects and points out important areas which require further study. The environmental surveillance revealed that the centralized hot water distribution system of the hospital was colonized with Legionella. Methods of prevention of the organisms for eradication involved in hospital water systems.

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Influence of amoebae and physical and chemical characteristics of water on presence and proliferation of Legionella species in hospital water systems

Cited by 59 publications

References 19 publications

Molecular Survey of the Occurrence of Legionella spp., Mycobacterium spp., Pseudomonas aeruginosa, and Amoeba Hosts in Two Chloraminated Drinking Water Distribution Systems

Molecular Survey of the Occurrence of Legionella spp., Mycobacterium spp., Pseudomonas aeruginosa, and Amoeba Hosts in Two Chloraminated Drinking Water Distribution Systems

Legionella pneumophila: From potable water to treated greywater; quantification and removal during treatment

Nosocomial Legionnaires’ Disease: Risque and Prevention

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