During the past few years there has been recognized, with increasing frequency, an acute respiratory infection associated with peculiar pulmonary lesions.1 The vast majority of these cases have occurred among young adults, especially at colleges,2 among hospital staffs3 and in army camps.4 Inability to isolate a common pathogenic bacterium has led to the use of the term "virus pneumonia." Numerous designations, including "current bronchopneumonia of unusual and undetermined etiology," "atypical pneumonia with leukopenia," "pneumonitis," "acute influenzal pneumonia," "acute diffuse bronchiolitis" and a variety of other names have been used in reporting similar cases. Actually, none of these terms adequately describe the pathologic picture. It would, we believe, be more nearly correct to call this disease an "acute bronchiolitis with associated atelectasis."
Our purpose in this report is to emphasize the epidemiologic importance of the disease, to consider its clinical features with special reference to the roentgenologic
CAMPBELL TA, STRONG PS, GRIER GS, LUTZ RJ. PRIMARY ATYPICAL PNEUMONIA: A REPORT OF TWO HUNDRED CASES AT FORT EUSTIS, VIRGINIA. JAMA. 1943;122(11):723–729. doi:10.1001/jama.1943.02840280007003
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