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Journal of Clinical Microbiology, May 1995, 1247-1252, Vol 33, No. 5
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Enzyme-linked immunoassay for detection of PCR-amplified DNA of legionellae in bronchoalveolar fluid

D Jonas, A Rosenbaum, S Weyrich and S Bhakdi
Institute of Medical Microbiology and Hygiene, University of Mainz, Germany.

A nonradioactive method is described that detects 10 to 100 legionellae in 1 ml of bronchoalveolar lavage fluid. DNA is purified by a proteinase K-phenol protocol or with a commercial DNA preparation kit and amplified by PCR with amplimers specific for the 16S rRNA gene of Legionella pneumophila. The upstream primer is 5' biotinylated. The amplification product is immobilized on streptavidin-coated microtiter plates. Because of the high binding capacity, no removal of nonincorporated biotin from the PCR product is required. After alkaline denaturation, the single-stranded PCR product is hybridized with a 5' digoxigenin-labeled probing oligomer. The amplification product is then detected by using peroxidase-labeled anti-digoxigenin antibodies in a luminescence or colorimetric reaction. The assay detects as few as 10 legionellae in 1-ml bronchoalveolar lavage fluid specimens. It is specific for medically relevant Legionella species, including Legionella pneumophila, L. bozemanii, and L. longbeachae. Of over 250 clinical specimens examined, 8 were positive for legionellae by both culture and the PCR assay. Six further specimens were culture negative but PCR positive for legionellae; of these, five specimens were from patients receiving high-dose erythromycin therapy for suspected or previously diagnosed legionella pneumonia. None of the remaining 240 specimens that were culture negative for legionellae yielded a positive PCR test, although a total of over 30 different bacterial species were cultured from these specimens. The PCR assay therefore appears to exhibit high sensitivity and specificity and thus could prove suitable for use in the routine microbiological diagnostic laboratory.

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