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March 23, 1935


JAMA. 1935;104(12):1026. doi:10.1001/jama.1935.02760120068027

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To the Editor:—  Since Dr. A. M. Crance believes it very important to distinguish between B. coli and "aerogenes types" in treating cases of bacilluria (The Journal, January 26, p. 285), I should like to point out an error in his method of differentiating these two species. Dr. Crance states that "Aerogenes produces gas within forty-eight hours in saccharose, whereas Escherichia does not." Bacteriologists have long recognized saccharose and nonsaccharose fermenting strains of B. coli and have termed them B. coli-communior and B. coli-communis, respectively. Thus Dr. Crance's test does not distinguish B. coli-communior from B. aerogenes. The importance of this distinction becomes apparent when it is realized, as Jordan (ed. 10, 1931) states that "nearly one half of the colon bacilli that are isolated from various sources produce gas in saccharose broth." It is surprising that Dr. Crance does not use the well recognized methods for differentiating these two

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