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Journal of Clinical Microbiology, 12 1997, 3054-3057, Vol 35, No. 12
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

Identification of Legionella species by lipopolysaccharide antigen pattern [In Process Citation]

D Jurgens and FJ Fehrenbach
Department of Bacteriology, Robert Koch-Institut, Berlin, Germany.

Electrophoretic analysis of lipopolysaccharide (LPS) extracts from 430 previously serotyped Legionella isolates and 28 American Type Culture Collection (ATCC) non-Legionella pneumophila Legionella reference strains representing different Legionella species and serogroups has been performed. LPS was prepared from Legionella suspensions by sonication and proteinase K digestion. Following sodium dodecyl sulfate- polyacrylamide gel electrophoresis, LPS bands were either stained with silver nitrate or transferred onto a nitrocellulose membrane and detected with rabbit antibodies raised against L. pneumophila serogroup 5, which was known to cross-react with L. pneumophila serogroups 1 to 14. Silver staining revealed that each of the 28 ATCC non-L. pneumophila Legionella strains possessed an individual and characteristic LPS banding pattern. The LPS profile was defined by the molecular weight of the visualized bands and/or the individual ladder- like LPS pattern. It was demonstrated by immunoblotting that non-L. pneumophila Legionella strains did not react with the serogroup 5 antiserum, thus allowing for the differentiation between L. pneumophila and non-L. pneumophila species.

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