E. L. Opie, M.D.
JAMA. 1919;73(8):627. doi:10.1001/jama.1919.02610340059026.
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To the Editor:  —The relationship of Bacillus influenzae to influenza is, at present, a subject of such great importance that I trust you will permit me to draw attention to a statement of Dr. W. H. Park in his article on "Bacteriology of Recent Pandemic of Influenza and Complicating Infections" (The Journal, Aug. 2, 1919, p. 318). Dr. Park says: "Although Keegan, Opie and their associates believe that the influenza bacilli are the causative agent, they present no real evidence." I have published no dogmatic opinion concerning the relationship of Bacillus influenzae to the disease because I have not believed that the data available justified a definite conclusion. The report of the commission of which I was a member (The Journal, Feb. 22, 1919, p. 556) contains evidence that Bacillus influenzae has been found in every instance of influenza which the commission studied by appropriate methods; but the significance of this


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