Molecular epidemiology of Legionella pneumophila environmental isolates representing nine different serogroups determined by automated ribotyping and pulsed-field gel electrophoresis

Stefania Boccia, Gualtiero Ricciardi, A. Stenico, L. Moroder, V. Romano-Spica

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The purposes of the study were (i) to describe the abundance and epidemiology of Legionellaceae in the man-made environment in a northern Italian area, (ii) to assess the concordance between pulsed-field gel electrophoresis (PFGE) and automated ribotyping (AR) techniques for genotyping L. pneumophila and (iii) to investigate the correlation between serogrouping and genotyping data. Water was sampled from reservoirs in 12 buildings across an area of 80-km radius. Despite the water temperature always being maintained above 55 degrees C, all of the buildings sampled were contaminated with Legionellaceae on at least one occasion and 63 L. pneumophila isolates representing nine different serogroups were collected. The two DNA methods revealed a high degree of genetic heterogeneity, even though identical L. pneumophila clones were recovered at different sites. The AR technique provided a fairly reliable approximation of PFGE results (73% concordance), however there was poor correlation between serogrouping and genotyping data as identical DNA fingerprints were shared by isolates of different serogroups.
Original languageEnglish
Pages (from-to)1097-1105
Number of pages9
JournalEpidemiology and Infection
DOIs
Publication statusPublished - 2005

Keywords

  • HOSPITAL-ASSOCIATED OUTBREAK
  • LEGIONNAIRES-DISEASE
  • MOLECULAR EPIDEMIOLOGY
  • WATER-SYSTEM
  • pulsed-field gel electrophoresis

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