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JAMA. 1915;LXIV(21):1742-1744. doi:10.1001/jama.1915.02570470026007.
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Since the researches of Poynton and Paine about fifteen years ago which resulted in the isolation of an infectious agent of acute rheumatism, much has been accomplished to elucidate the etiology of infections of the endocardium. Particular interest attaches to the work of Billings, who in 1909 isolated what appeared to be an attenuated pneumococcus in slow endocarditis. Schottmüller,1 in March, 1910, gave the name of endocarditis lenta to a group of cases which appear to be the same as those described the year before by Billings as due to an organism to which he gave the name of Streptococcus viridans on account of its growing with a greenish color on agar. Publications by Libman and Cellar in March of the same year added further interest to this type of endocarditis and it remained for Rosenow2 to harmonize the bacteriology of the subject by demonstrating that by varying


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