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Germ theory of disease states that specific microscopic organisms called pathogens are responsible for causing infectious diseases in humans, animals, and plants. Before this concept was accepted, many people believed that diseases were caused by supernatural forces, imbalances in bodily fluids, or “bad air.” The development of microscopes and scientific experimentation in the seventeenth to nineteenth centuries helped scientists observe microorganisms and link them directly to illness. _____ ________ ________ ________ _________ ___ ________ ___ _____ ________ ____.
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