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Journal of Clinical Microbiology
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Research Article

Detection of Legionella spp. in bronchoalveolar lavage fluids by DNA amplification.

B Jaulhac, M Nowicki, N Bornstein, O Meunier, G Prevost, Y Piemont, J Fleurette, H Monteil
B Jaulhac
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M Nowicki
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N Bornstein
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O Meunier
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G Prevost
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Y Piemont
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J Fleurette
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H Monteil
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ABSTRACT

By using Taq polymerase, DNA amplification of a specific fragment of the macrophage infectivity potentiator (mip) gene from Legionella pneumophila was used to detect Legionella spp. in bronchoalveolar lavage (BAL) fluid specimens. We were able to detect DNAs from all 30 L. pneumophila strains tested (serogroups 1 to 14), L. micdadei, and L. bozemanii serogroup 1. DNA from bacteria of other species tested and DNA from human leukocytes were not amplified by this procedure. After optimization of the conditions for DNA extraction from BAL fluid, a 2-ml sample of BAL fluid seeded with 25 CFU/ml tested positive after DNA amplification. A total of 68 frozen BAL fluid specimens sent to the laboratory because of suspected legionellosis were tested in a retrospective study. The eight culture-positive samples were all positive after specific DNA amplification. Among 60 culture-negative samples, 7 were positive after amplification. Of these seven samples, four were from patients who had presented a typical clinical history of legionellosis; the samples had antibody titer increases of 2 dilutions. For the three remaining samples, serological diagnosis of legionellosis in the patients from whom the samples were obtained could not be documented, and although the causative agent of these pulmonary infections was not determined, the clinical features of the patients were in accordance with legionellosis.

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Detection of Legionella spp. in bronchoalveolar lavage fluids by DNA amplification.
B Jaulhac, M Nowicki, N Bornstein, O Meunier, G Prevost, Y Piemont, J Fleurette, H Monteil
Journal of Clinical Microbiology Apr 1992, 30 (4) 920-924; DOI:

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Detection of Legionella spp. in bronchoalveolar lavage fluids by DNA amplification.
B Jaulhac, M Nowicki, N Bornstein, O Meunier, G Prevost, Y Piemont, J Fleurette, H Monteil
Journal of Clinical Microbiology Apr 1992, 30 (4) 920-924; DOI:
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