In the majority of cases of chronic abscesses of the lung reported in the literature, the bacteriologic study has been limited to the preparation and examination of stained smears for the presence primarily of fusiform bacilli and spirochetes, the diagnosis being made on the satisfactory demonstration of these organisms in conjunction with the clinical observations. Chief clinical interest in the so-called "etiology" of this condition has been in whether it results primarily from the aspiration of infected material from the mouth and nasal passages or from the introduction of infected emboli into the blood stream. In contradistinction to the study of the predisposing factors, complete bacteriologic studies of the bacterial flora in these cases have been surprisingly few in number.
In pathologic conditions such as abscesses of the lung, it is extremely difficult to select any one organism or even a number of organisms as the etiologic factors. It is
VARNEY PL. DEMONSTRATIONS OF EXPERIMENTAL WORK IN THE WASHINGTON UNIVERSITY SCHOOL OF MEDICINE: 6. THE BACTERIAL FLORA OF TREATED AND UNTREATED ABCESSES OF THE LUNG. Arch Surg. 1929;19(6):1602–1617. doi:10.1001/archsurg.1929.01150060664037
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