Date on Master's Thesis/Doctoral Dissertation


Document Type

Master's Thesis

Degree Name


Department (Legacy)

College of Arts and Sciences


Bacteria--Health aspects; Bacterial diseases


It is to be noticed that if there be any marshy places, certain animals breed there, which are invisible to the eye and yet getting into the system through the mouth and nostrils cause serious disorders." This quaint observation is taken from a manuscript written over two thousand years ago, showing that bacteria even if not seen, were living and active. Latin writers of about the same time recorded a relation between insects and malaria which has but lately been proved and explained. The infectious character of leprosy has long been recognized, since the ancient Hebrews caused the isolation of the afflicted. The laws of Moses point to some knowledge of the nature of infections: "This is the law, when a man dieth in a tent; all that come into the tent, and all that is in the tent shall be unclean for several days. And every open vessel which has no covering upon it shall be unclean.