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Canadian Journal of Infectious Diseases
Volume 9, Suppl E, Pages 27E-29E

Epidemiology of Community-Acquired Pneumonia

Thomas J Marrie

Departments of Medicine and Microbiology, Dalhousie University and the Queen Elizabeth II Health Sciences Centre, Haljfax, Nova Scotia, Canada

Copyright © 1998 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Community-acquired pneumonia (CAP) is a common and a serious illness. Streptococcus pneumoniae accounts for about half of all cases of CAP. Atypical pneumonia, ie, pneumonia due to Mycoplasma pneumoniae. Chlamydia pneumoniae. Legione species or viruses, is more common among patients treated on an ambulatory basis where these pathogens can collectively cause up to half of all cases of pneumonia. Changes in patient and microbe populations alter The epidemiology of pneumonia. Aspiration and Gram-negative rod pneumonia tend to be more common in nursing home populations. The emergence of macrolide- and beta-lactam-resistant S pneumoniae has major implications for the approach to patients with CAP.