It is not the purpose of this report to deal with the old and controversial question of the significance of Bacillus coli communis as an indication of pollution in drinking water, nor to go into details upon the typical or atypical biologic characteristics of the organism; but especially to determine a constant biologic feature by which it can be differentiated with certainty from the allied species of the colon group. It is common knowledge that B. coli communis presents such extensive variations that often cultures isolated from water and reported as identical with this micro-organism will, if studied more closely, be found to have very little or no relation at all with it. The hypothesis that the acceptance of such variations in B. coli communis is responsible for the unsatisfactory results often obtained in the bacteriologic examination of drinking water has been the basis for undertaking the following studies.
RIVAS D. THE DIFFERENTIATION OF BACILLUS COLI COMMUNIS FROM ALLIED SPECIES IN WATER. JAMA. 1908;L(19):1492–1495. doi:10.1001/jama.1908.25310450002001a
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