Acute pulmonary infections caused by the Friedländer bacillus group have been known since 1882 and 1883, when Friedländer1 described the micro-organism and attributed to it the cause of pneumonia. After several years of controversy by various investigators, Fraenkel2 in 1886 described the pneumococcus as the cause of pneumonia and assigned the Friedländer bacillus to the rôle of a secondary invader. So convincing was Fraenkel's work that many physicians accepted it without qualification. However, soon afterward, in 1886, Weichselbaum3 showed that the bacillus of Friedländer caused 5.5 per cent of the cases in a series of more than 100 patients. It was nearly ten years before valid confirmation of this work was produced by others, although many believed in it.
Some of the most acceptable reports were given by Étienne,4 1895; Comba,5 1896; Smith,6 1897; Thiroloix,7 1897; Howard,8 1898; Béco,9 1899; Moïsejew,10 1900; Brinckerhoff and Thompson,11 1901; Kokawa,12 1904; Stühlern,13 1904;
SWEANY HC, STADNICHENKO A, HENRICHSEN KJ. MULTIPLE PULMONARY ABSCESSES SIMULATING TUBERCULOSIS: CAUSED BY THE FRIEDLÄNDER BACILLUS. Arch Intern Med (Chic). 1931;47(4):565–582. doi:10.1001/archinte.1931.00140220054003
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