Chest
Community-Acquired Pneumonia: Etiology, Epidemiology, and Treatment
Section snippets
ETIOLOGY AND EPIDEMIOLOGY
Despite the importance of pneumonia as a medical entity, it is not a reportable disease, and as a result, statistics dealing with it are suboptimal. Data from the United States suggest that there are approximately 2 to 4 million cases per year.5 Not surprisingly, attack rates appear to be highest at the extremes of age, and the overall attack rate is 10 to 12 cases per 1,000 persons per year.6, 7
In those less than 5 years of age and in the elderly, the incidence rises sharply. In 2 studies from
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