Journal Article

Four Years of Experience with Silver-Copper Ionization for Control of <i>Legionella</i> in a German University Hospital Hot Water Plumbing System

Ute Rohr, Martin Senger, Fidelis Selenka, Ralf Turley and Michael Wilhelm

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 29, issue 6, pages 1507-1511
Published in print December 1999 | ISSN: 1058-4838
Published online December 1999 | e-ISSN: 1537-6591 | DOI: http://dx.doi.org/10.1086/313512
Four Years of Experience with Silver-Copper Ionization for Control of Legionella in a German University Hospital Hot Water Plumbing System

More Like This

Show all results sharing these subjects:

  • Infectious Diseases
  • Immunology
  • Public Health and Epidemiology
  • Microbiology

GO

Show Summary Details

Preview

Silver-copper ionization was used for controlling Legionella distribution in a German university hospital hot water plumbing system for 4 years. In the beginning, silver concentrations were not allowed to exceed 10 εg/L because of drinking water regulation limits in Germany. Water samples were monitored for Legionella counts, temperature, and silver and copper concentrations. A significant (P < .001) 3.8-log reduction of Legionella counts, from 40,000 cfu/L to 7 cfu/L, was found during the first year with silver-copper ionization. Nevertheless, the long-term efficacy of silver concentrations <10 εg/L was not sufficient. Legionella counts increased to 10,000 cfu/L during the third year. During the fourth year, we studied the influence of higher silver concentrations on Legionella distribution. With an average silver level of 30 εg/L, only a 1.3-log reduction in Legionella, to 500 cfu/L, was achieved. The effect was not significant (P = .071); therefore, it must be considered that Legionella developed a tolerance to silver ions.

Journal Article.  2755 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.