Microscopy Bacteriology And Human Parasitology a Manual for Students And Pra
Microscopy Bacteriology And Human Parasitology a Manual for Students And Pra
P Paul Mile Archinard
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Rats can not be success- fully inoculated with the anthrax bacillus, though other rodents are very susceptible. Again, pigeons are not sus- ceptible but are immune to the anthrax bacillus. The expla- nation of this natural immunity is not easily given. It is supposed in some cases to be due to the mode of living of the immune animal, or to some condition of its secretions, or to some substances found in its blood and tissues which are able to destroy bacterial life or to neutralize their toxins.... These substances are called alexins. Examples of Acquired Immunity. This may be due, as just mentioned, to a previous attack of disease, and when due to this it lasts in the majority of instances during the life of the animal. In other cases acquired immunity can be arti- ficially induced in animals, and according to the methods used for its production is said to be active or passive. IMMUNITY AND ITS VARIETIES. 99 1. Active acquired immunity is produced by the action of living germs or their toxins introduced into the animal.
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