The colon bacillus has been found in connection with a large number of diseases, but whether it can be stated to be the real cause of many of these processes is still an undecided question. There are as yet great difficulties in the way of accurate identification and classification of bacteria, as witness the so long confused relations between the colon and typhoid bacilli. Only recently has it been possible, by means of Pfeiffer's phenomenon (Widal's reaction), to show that there is a fundamental difference between these two organisms.
A large number of the investigations bearing on the colon bacillus are of little value, because of the incomplete descriptions of the forms of growth and other biologic characteristics of the bacilli studied. Rahlff1 attempts to draw a clear picture of the typic colon bacillus and its biology. For this purpose he cultivated sixty-two different kinds of this microbe, partly
STUDIES OF THE COLON BACILLUS.—COLON INFECTION OF THE URINARY TRACT. JAMA. 1898;XXXI(25):1483–1484. doi:10.1001/jama.1898.02450250041005
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