Atypical pneumonia.

The atypical pneumonia syndrome usually implies a benign illness where systemic complaints predominate over respiratory symptoms. Cough is prominent; chest radiographic findings are varied. Many organisms are associated with this syndrome. Mycoplasma pneumoniae, Chlamydia psittaci, Chlamydia pneumoniae, Coxiella burnetii, and Francisella tularensis are reviewed in this article.