Treatment of a Legionella pneumophila-Colonized Water Distribution System Using Copper-Silver Ionization and Continuous Chlorination

  title={Treatment of a Legionella pneumophila-Colonized Water Distribution System Using Copper-Silver Ionization and Continuous Chlorination},
  author={Amaya Biurrun and Luis Caballero and Carmen Pelaz and Elena Le{\'o}n and Alberto Gago},
  journal={Infection Control \&\#x0026; Hospital Epidemiology},
  pages={426 - 428}
Abstract The detection in April 1997 of a case of nosocomial legionellosis in our hospital led to the discovery that both our hot- and cold-water circuits were heavily colonized with Legionella pneumophila. Conventional methods for eradication of the organisms were unsuccessful, so a copper-silver (Cu-Ag) ionization system and a continuous chlorination system were installed. Five months later, the number of colonized sites decreased from an initial 58.3% to 16.7%. 

Persistence of chlorine‐sensitive Legionella pneumophila in hyperchlorinated installations

Aims:  To study the persistence of Legionella over time in different disinfected facilities and analysing whether failures in bacterial eradication could be the result of a decrease in the

Efficacy of Copper-Silver Ionization in Controlling Legionella in a Hospital Hot Water Distribution System: a German Experience

This chapter evaluates the efficacy of copper-silver ionization that is reported to be a useful tool to control growth of Legionella. Copper-silver ionization was tested over a period of 1 year as

Efficacy of Copper-Silver Ionization in Controlling Biofilm- and Plankton-Associated Waterborne Pathogens

At concentrations below the EPA limits, ionization has potential to control the three waterborne pathogens, in addition to Legionella, in hospital water systems for nosocomial infection control.


The long-term efficacy of copper-silver ionization as a disinfection method in controlling Legionella in hospital water systems and reducing the incidence of hospital-acquired legionnaires' disease is assessed.

Legionella pneumophila in ospedale, un pr o blema superabile.

Chlorination with sodium hypochlorite or other chlorine compounds, superheathing, copper/silver ionization, UV radiation, ozone and other treatments of drinking and hot waters, if rationally used, may contribute substantially to avoiding this preventable pneumonia.

Control of Legionella in Drinking Water Systems: Impact of Monochloramine

Investigations indicate that it is possible to prevent 90% of drinking-water-associated Legionnaires' disease through the use of monochloramine for residual municipal water disinfection, and this finding is not just important for control of nosocomial infections.

Assessment of bismuth thiols and conventional disinfectants on drinking water biofilms

The effects of the current strategies for disinfection of drinking water systems in large buildings were compared with a new generation of bismuth thiol (BT) biocides.



Legionella Disinfection of Water Distribution Systems: Principles, Problems, and Practice

Progress in the field of disinfection directed at hospital water systems has been necessarily slow, and cases of nosocomial legionellosis continue to appear, increasing pressures for hospitals to find solutions.

Controlled evaluation of copper-silver ionization in eradicating Legionella pneumophila from a hospital water distribution system.

Copper-silver ionization can eradicate L. pneumophila in a water distribution system because of its relatively low cost, straightforward installation, easy maintenance, nontoxic by-products and the presence of a disinfecting residual.

Controlling Legionella in Hospital Water Systems: Experience With the Superheat-and-Flush Method and Copper-Silver Ionization

It is concluded that a properly maintained and monitored copper-silver ionization system was more effective than the superheat-and-flush method for reducing the recovery of Legionella from the hospital water distribution system.

Disinfection of water distribution systems for legionella: a review of application procedures and methodologies.

Hospital-acquired legionella pneumonia is emerging as a major problem; potable water distribution systems have been shown to be the primary reservoirs for the legionella organisms. As a result,

Legionnaires' disease associated with a hospital water system. A five-year progress report on continuous hyperchlorination.

Continuous hyperchlorination of the hot and cold water began in January 1982, and chlorine levels of 3 to 5 mg/L have been maintained most recently, and water samples have been consistently negative for Legionella for more than five years.

Efficacy of copper and silver ions and reduced levels of free chlorine in inactivation of Legionella pneumophila

All disinfection systems, regardless of temperature or free chlorine concentration, showed increase inactivation rates when 400 and 40 micrograms of copper and silver per liter was added; however, this trend was significant only at 0.4 mg of free chlorine per liter.

Legionellae isolated from clinical and environmental samples in Spain (1983–90): monoclonal typing of Legionella pneumophila serogroup 1 isolates

Characterization of samples from four outbreaks in which both clinical and environmental isolates had been recovered permitted the recognition of three Philadelphia 1 or Allentown 1 and one Knoxville 1 strains as the aetiological agents.

[Guidelines for the prevention of nosocomial pneumonia].

This revised guideline is designed to reduce the incidence of nosocomial pneumonia and is intended for use by personnel who are responsible for surveillance and control of infections in acute-care hospitals; the information may not be applicable in long-term-care facilities because of the unique characteristics of such settings.