Research on the procedure for recovery and species identification of Legionella from surface environmental water / 中华预防医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To establish a set of procedure for recovery and species identification of Legionella from the surface environmental water.</p><p><b>METHODS</b>Forty-four water samples were collected in eight parks of Guangzhou city from August to November in 2006. The bacteriologic examination was performed by cultivation on BCYEalpha plate, and 108 presumptive Legionella colonies were picked and their homogeneous relationship was analyzed by using an amplified fragment length polymorphism (AFLP) method. Species identification was carried out by latex agglutination test, biochemical characterization, analysis of cellular fatty acids composition, 16 S rRNA gene and mip gene sequencing.</p><p><b>RESULTS</b>Legionella was recovered among 27 (61.36%) samples of all eight parks, and 31 different strains were identified from those 108 presumptive Legionella isolates by AFLP method, including 20 strains of L. pneumophila, five strains of L. feeleii, four strains of L. longbeachae, one strain of L. oakridgensis and one strain of L. sainthelensi, and L. pneumophila could be easily differentiated by phenotypic and biochemical characteristics, latex agglutination test or analysis of the cellular fatty acids composition . However, uncertain factors were existing in those phenotypic identification methods as compared to the sequence analysis.</p><p><b>CONCLUSION</b>The taxonomic analysis of the Legionellae family should be dependent on the 16 S rRNA gene or mip gene.</p>