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Updated: May 13, 2025
The attempts to produce immunity by vaccination with weakened or localised disease germs is really an attempt to train and develop to a high point the activities of the phagocytes or eater-cells of the blood. He was "immune" to all poisons.
In higher animals what we call "inflammation" is a condition the result of a new and advantageous mechanism which consists in a local retarding of the blood-current, effected by the action of the nerves on the muscular walls of the blood-vessels, and the consequent escape of the eater-cells into the injured or infected tissue, there to eat up and destroy the injurious microbes or other particles.
Nature provides at least three varieties of defence within the blood of higher animals against disease-producing microbes which have broken through the outer line of fortification, the skin. These latter agents, actual particles of the living animal in which they exist, are the "eater-cells," or "phagocytes" minute, viscid, actively moving cells, resembling the animalcules called "amoeba."
It is of the utmost importance to us that our white corpuscles, or eater-cells, should not be sluggish but greedy. Why? Because they are at once eaten by the vigilant phagocytes of the blood before they can produce any appreciable amount of poison. That is easily demonstrated by experiment.
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