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Any of several bacteria can cause pyelonephritis, but the worst offender is the colon bacillus.

The foulness of the mouth is supposed to be due to the colon bacillus and its allies, but those obtained from the mouth are innocuous.

A doctor writes us that infection by the colon bacillus can be excluded, but we should say that what the patient needs is not a doctor but a proof reader.

Generally, a chemist will also determine the presence of the colon bacillus which is found in the intestinal tract of man or warm-blooded animals.

The inability to readily separate the typhoid germ, for instance, from the colon bacillus, an organism frequently found in milk, presents technical difficulties not easily overcome.