Journal Article

Microbial Etiology of Community-Acquired Pneumonia in the Adult Population of 4 Municipalities in Eastern Finland

Camilla Jokinen, Leena Heiskanen, Helvi Juvonen, Sakari Kallinen, Marjaana Kleemola, Markku Koskela, Maija Leinonen, Pirjo-Riitta Rönnberg, Pekka Saikku, Marja Stén, Airi Tarkiainen, Hannu Tukiainen, Kalevi Pyörälä and P. Helena Mäkelä

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 32, issue 8, pages 1141-1154
Published in print April 2001 | ISSN: 1058-4838
Published online April 2001 | e-ISSN: 1537-6591 | DOI: http://dx.doi.org/10.1086/319746
Microbial Etiology of Community-Acquired Pneumonia in the Adult Population of 4 Municipalities in Eastern Finland

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To determine the etiology of community-acquired pneumonia in the adult population of a defined area, specific antibody responses in paired serum samples, levels of circulating pneumococcal immune complexes in serum samples, and pneumococcal antigen in urine were measured. Samples (304 paired serum samples and 300 acute urine samples) were obtained from 345 patients ⩾15 years old with community-acquired, radiologically confirmed pneumonia, which comprised all cases in the population of 4 municipalities in eastern Finland during 1 year. Specific infecting organisms were identified in 183 patients (including 49 with mixed infection), as follows: Streptococcus pneumoniae, 125 patients; Haemophilus influenzae, 12; Moraxella catarrhalis, 8; chlamydiae, 37 (of which, Chlamydia pneumoniae, 30); Mycoplasma pneumoniae, 30; and virus species, 27. The proportion of patients with pneumococcal infections increased and of those with Mycoplasma infections decreased with age, but for each age group, the etiologic profile was similar among inpatients and among outpatients. S. pneumoniae was the most important etiologic agent. The annual incidence of pneumococcal pneumonia per 1000 inhabitants aged ⩾60 years was 8.0.

Journal Article.  7072 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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