Atypical organisms are generally associated with a milder form of pneumonia, the so-called "walking pneumonia." A feature that makes these organisms atypical is the inability to detect them on Gram stain or to cultivate them in standard bacteriologic media. In addition, they often produce several nonpulmonary related symptoms. Atypical organisms include the following:
For more on the etiology of pneumonia, read here.
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Cite this: Michael Stuart Bronze. Fast Five Quiz: How Much Do You Know About Pneumonia? - Medscape - Feb 16, 2016.