Abstract
A commercial DNA probe kit designed to detect rRNA from legionellae was evaluated for its ability to correctly discriminate between legionellae and non-legionellae taken from culture plates. The probe kit, made by the Gen-Probe Corp. (San Diego, Calif.), was radiolabeled with 125I, and probe bacterial RNA hybridization, detected in a simple one-tube system hybridization assay, was quantitated with a gamma counter. A total of 156 Legionella sp. strains were tested, of which 125 were Legionella pneumophila and the remainder were strains from 21 other Legionella spp. A total of 106 gram-negative non-legionellae, isolated from human respiratory tract (81%) and other body site (19%) specimens, were also tested; 14 genera and 28 species were represented. The probe easily distinguished all of the legionellae from the non-legionellae. The average legionellae/non-legionellae hybridization ratio was 42:1, and the lowest ratio was 2:1; a minor modification in the procedure increased the lowest ratio to 5:1. In addition to correctly identifying all Legionella species, the probe was able to separate some of the various species of Legionella. L. pneumophila strains hybridized more completely to the probe than did the other Legionella spp.; L. wadsworthii and L. oakridgensis hybridized only about 25% of the probe relative to L. pneumophila. Some strains of phenotypically identified L. pneumophila had much lower hybridization to the probe than other members of the species and may represent a new Legionella species. The simplicity of the technique and specificity of the probe make it a good candidate for confirming the identity of legionellae in culture.
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Selected References
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- Edelstein P. H., McKinney R. M., Meyer R. D., Edelstein M. A., Krause C. J., Finegold S. M. Immunologic diagnosis of Legionnaires' disease: cross-reactions with anaerobic and microaerophilic organisms and infections caused by them. J Infect Dis. 1980 May;141(5):652–655. doi: 10.1093/infdis/141.5.652. [DOI] [PubMed] [Google Scholar]
- Edelstein P. H., Meyer R. D., Finegold S. M. Laboratory diagnosis of Legionnaires' disease. Am Rev Respir Dis. 1980 Feb;121(2):317–327. doi: 10.1164/arrd.1980.121.2.317. [DOI] [PubMed] [Google Scholar]
- Glupczynski Y., Labbe M., Yourassowsky E. Cross-reactivity of environmental bacteria with fluorescent-antibody conjugates for Legionella pneumophila. Eur J Clin Microbiol. 1984 Jun;3(3):215–215. doi: 10.1007/BF02014884. [DOI] [PubMed] [Google Scholar]
- Grimont P. A., Grimont F., Desplaces N., Tchen P. DNA probe specific for Legionella pneumophila. J Clin Microbiol. 1985 Mar;21(3):431–437. doi: 10.1128/jcm.21.3.431-437.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Johnson D. A., Wagner K. F., Blanks J., Slater J. False-positive direct fluorescent antibody testing for Legionella. JAMA. 1985 Jan 4;253(1):40–41. doi: 10.1001/jama.253.1.40b. [DOI] [PubMed] [Google Scholar]
- Orrison L. H., Bibb W. F., Cherry W. B., Thacker L. Determination of antigenic relationships among legionellae and non-legionellae by direct fluorescent-antibody and immunodiffusion tests. J Clin Microbiol. 1983 Feb;17(2):332–337. doi: 10.1128/jcm.17.2.332-337.1983. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Selander R. K., McKinney R. M., Whittam T. S., Bibb W. F., Brenner D. J., Nolte F. S., Pattison P. E. Genetic structure of populations of Legionella pneumophila. J Bacteriol. 1985 Sep;163(3):1021–1037. doi: 10.1128/jb.163.3.1021-1037.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Thacker W. L., Plikaytis B. B., Wilkinson H. W. Identification of 22 Legionella species and 33 serogroups with the slide agglutination test. J Clin Microbiol. 1985 May;21(5):779–782. doi: 10.1128/jcm.21.5.779-782.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Zuravleff J. J., Yu V. L., Shonnard J. W., Davis B. K., Rihs J. D. Diagnosis of Legionnaires' disease. An update of laboratory methods with new emphasis on isolation by culture. JAMA. 1983 Oct 21;250(15):1981–1985. doi: 10.1001/jama.250.15.1981. [DOI] [PubMed] [Google Scholar]