The specific etiologic agent of pneumonia cannot be identified in up to 40 to 60 percent of patients. 4,5,6,Z,,8.,9and 1° The predominant pathogens that cause pneumonia in pediatric patients are a function of the patient's age, the presence of underlying disease, the vaccination status, and attendance in day care. Since clustering of cases of pneumonia due to a particular microbe are common, it is helpful to be aware of recent local outbreaks. When an etiologic agent is identified, the best predictor of the agent is age. The most common etiologic agents causing pneumonia according to age groups are illustrated in TaMe^!?!.-.],, and discussed below.
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