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It is not yet definitely proven that germs are essential elements in the production of any disease. It seems probable that they are only incidental and perhaps beneficial factors. However, this much is certain, whatever part they perform in the production of disease, germs alone can no more produce disease than a seed alone can produce a tree. Just as a seed must have fertile soil, moisture, warmth, air and sunlight, if it is to grow into a tree, so the germ, if it is to produce disease, must find certain essential conditions existing in the bodies of those it enters before it can do the slightest harm. (en) |
