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Legionella pneumophila in Norwegian naval vessels

Legionella pneumophila in Norwegian naval vessels

Category
Journal publication
Abstract
BACKGROUND Little is known about the occurrence of Legionella pneumophila in water supply systems on board ships. Our aim was to study the occurrence of L. pneumophila in the water supply system on board Norwegian naval vessels as the basis for framing preventive strategies against Legionella infection. MATERIAL AND METHOD Water samples were collected from technical installations and from the water distribution network on board 41 vessels and from ten water filling (bunkering) stations, the sampling taking place in two rounds separated by a one-year interval. The samples were subjected to analysis, including serotyping and genotyping, with a view to identifying the presence of L. pneumophila and of free-living amoebae. RESULTSL. pneumophila was found in 20 out of a total of 41 vessels in the first round of sampling, and live L. pneumophila serogroup 1 was isolated in seven of the 20 vessels. Free-living amoebae were found in the water supply system in most of the vessels, including all the vessels with L. pneumophila. The same genotype of L. pneumophila was identified in the water in bunkering stations and in the water on board the vessels. INTERPRETATIONL. pneumophila was not present in all the vessels, but all the vessels where the bacterium was found were also contaminated with free-living amoebae. We have demonstrated the probability of the fresh water from bunkering stations being the source of the contamination. In framing preventive strategies, importance should therefore be attached to identifying the source of contamination and the presence of free-living amoebae, as a premise for the establishment and growth of L. pneumophila in onboard water supply systems.
Client
  • Egen institusjon / Ingen
Language
English
Author(s)
  • Ahlen Catrine
  • Aas Marianne
  • Nor Anne
  • Wetteland Per Inge
  • Johansen Hjalmar
  • Sørbø Trine
  • Sommerfeldt-Pettersen Jan K
  • Iversen Ole-Jan
Affiliation
  • SINTEF Ocean / Miljø og nye ressurser
  • Norwegian University of Science and Technology
  • The Royal Norwegian Navy
Year
2013
Published in
Tidsskrift for Den norske legeforening
ISSN
0029-2001
Publisher
Den norske legeforening
Volume
14
Issue
133