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Abstract

The relative security we find today, which characteri­zes the twentieth century, makes it almost impossible for us to believe the extreme disasters, fear, and suffering that predominated in the days of dirt, disease, ignorance, and pestilence. Only a few detailed stories of pre-historic times are necessary to make every one of us appre­ciate the immense distance that we have traveled since the earliest records of diseases that swept the lands at tremendous speed.

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