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. 1990 Feb;28(2):242–245. doi: 10.1128/jcm.28.2.242-245.1990

Molecular typing of nosocomial isolates of Legionella pneumophila serogroup 3.

C Tram 1, M Simonet 1, M H Nicolas 1, C Offredo 1, F Grimont 1, M Lefevre 1, E Ageron 1, A Debure 1, P A Grimont 1
PMCID: PMC269583  PMID: 2179256

Abstract

In Paris, France, an outbreak of pneumonia due to Legionella pneumophila serogroup 3 was observed in Necker (four cases) and Pitié (six cases) hospitals. Neither the 10 clinical isolates nor 5 tap water isolates from Necker Hospital harbored plasmids. Clinical and environmental serogroup 3 isolates and serogroup 3 reference strain Bloomington 2 were analyzed by chromosomal probe fingerprinting. rRNA, 16S and 23S from Escherichia coli and a randomly cloned 15-kilobase-pair nucleotide sequence from L. pneumophila serogroup 3 were used as probes. All strains tested showed a single pattern after HindIII digestion of DNA and hybridization with the 32P-end-labeled rRNA probe, whereas three patterns were obtained after hybridization with the 32P-labeled 15-kilobase-pair DNA probe. One pattern was given by all clinical and tap water isolates from Necker Hospital, another one was given by all clinical isolates from Pitié Hospital, and a last one was given by reference strain Bloomington 2. Thus, molecular analysis showed that the two hospital outbreaks of legionellosis were unrelated and could link the outbreak in Necker Hospital to contaminated tap water.

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Selected References

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