Publisher's Synopsis
Excerpt from Recent Progress in the Bacteriology of Typhoid Fever
In these studies upon typhoid immunity the name of R. Pfeiffer of Berlin stands out pre - eminent, and the results obtained have been of the greatest possible interest and value.
As has already been said, the typhoid bacillus, in suffi cient doses, is pathogenic for a number of the experimental animals. If, however, the animal is inoculated with small and gradually increasing doses, death does not follow, but the animal finally reaches a point where it can bear without detriment doses which would be certainly fatal to animals unaccustomed to the typhoid poison. In other words, the animal has become immune as far as the typhoid bacillus is concerned, and its condition resembles exactly that of a human being convalescent from typhoid fever or any other disease which carries, with a single infection, freedom from a future attack.
The next point of interest to be brought out was the fact that the blood of an animal made thus artificially immune to typhoid infection, when injected into a second animal.
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