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1 The Pulmonary Unit and 2 Division of Internal Medicine, Soroka Medical Centre and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, and 3 the Microbiology Laboratory, Asaf Harofeh Medical Center, Zerifin, Bar-Ilan University, Ramat-Gan, Israel
CORRESPONDENCE: D. Lieberman, Pulmonary Unit, Soroka Medical Centre, Beer-Sheva, Israel, 84101. Fax: 97 286403022. E-mail: Lieberma@bgumail.bgu.ac.il
Keywords: chronic obstructive pulmonary disease, exacerbation, Legionella
Received: June 28, 2001
Accepted October 1, 2001
A prospective study was conducted to identify and characterize hospitalizations for acute exacerbations of chronic obstructive pulmonary disease (AECOPD) with serological evidence of infection with Legionella spp. (Lsp).
Two-hundred and forty hospital admissions for AECOPD of 213 patients were included in the study. Paired sera were obtained for each of the admissions and were tested for 41 different serogroups of Lsp, using microimmunofluorescence-serology. Only a significant change in immunoglobulin-G and/or immunoglobulin-M antibody titres was considered diagnostic.
In 40 admissions (16.7%) there was serological evidence of infection with Lsp (LspH). Legionella pneumophila 1 was identified in nine admissions, L. pneumophila 3–15 in 19 and nonpneumophila in 22. In 26 LspH (65%) there was serological evidence of infection with at least one other respiratory pathogen. Compared to the 200 admissions without Lsp (NLspH), the LspH patients were younger (p<0.05) and more hypoxaemic (p<0.04). None of the cases in the LspH group had an abrupt onset of disease, compared to 58 (29.0%) in the NLspH group (p<0.0001). The incidence of myalgia/arthralgia was 55% for LspH compared to 37% for NLspH (p<0.03).
To conclude, serological evidence of infection with Legionella spp. is common among patients hospitalized with acute exacerbations of chronic obstructive pulmonary disease. In most hospital admissions with serological evidence of infection with Legionella spp. an additional respiratory pathogen can be identified. Acute exacerbation develops gradually in these patients and is characterized clinically by more systemic manifestations than hospital admissions without serological evidence of infection with Legionella spp. The true interpretation and practical relevance of these findings should be determined in further studies.
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