Current Microbiology

, Volume 41, Issue 5, pp 374–376

A Comparison of Legionella pneumophila Occurrence in Hot Water Tanks and Instantaneous Devices in Domestic, Nosocomial, and Community Environments

  • Fabrizia Martinelli
  • Arnaldo Caruso
  • Lina Moschini
  • Adolfo Turano
  • Carmelo Scarcella
  • Fabrizio Speziani

DOI: 10.1007/s002840010152

Cite this article as:
Martinelli, F., Caruso, A., Moschini, L. et al. Curr Microbiol (2000) 41: 374. doi:10.1007/s002840010152

Abstract

The aim of this study was to compare the occurrence of L. pneumophila in hot water samples from hot water tanks and instantaneous devices. Tanks and devices were all operated by heat exchangers employed in the town's district heating system. Thirty-six out of 171 (21%) hot water samples tested positive for L. pneumophila isolation, with 14.6% belonging to serogroup 1 and 6.4% to serogroups 2–14. The proportion of L. pneumophila detected in hot water reservoirs (30%) was higher than that observed in hot water instantaneous devices (6.2%). Differences in L. pneumophila isolation reflected different temperatures registered at the faucet: ≤50°C for hot water from reservoir devices, and >60°C for hot water from instantaneous devices. These data emphasize the need to control temperature in hot water distribution devices, thus inhibiting the formation of biofilm and L. pneumophila colonization.

Copyright information

© Springer-Verlag New York Inc. 2000

Authors and Affiliations

  • Fabrizia Martinelli
    • 1
  • Arnaldo Caruso
    • 2
  • Lina Moschini
    • 1
  • Adolfo Turano
    • 2
  • Carmelo Scarcella
    • 1
  • Fabrizio Speziani
    • 1
  1. 1.Public Health Laboratory, ASL, Brescia, ItalyIT
  2. 2.Institute of Microbiology, University of Brescia Medical School, Piazzale Spedali Civili 1, 25124 Brescia, ItalyIT