Koch's postulates
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Koch's postulates are a set of broad principles laid out by Robert Koch in the 1880's. They are the basic criteria for determining what is and is not an infectious disease in plants, animals, and humans. Because they are at the level of philosophy of science, they can be applied to viral, bacertial, or parasite-caused infection theories. Though aspects of the principles were not original, Robert Koch provided an experimental basis for these principles that was very convincing to the scientists of his day.