A scientist by name of Robert Koch created a set of postulates (recommendations) in the late 1800s that can be used to demonstrate that a certain pathogen is the actual cause of an illness. The Robert Koch postulates are a set of standards for determining whether a specific organism is the root of a specific disease. They were first published in 1890. Koch's theories are still taught in college and high school courses today as proof of the accuracy and reliability of clinical microbiology.
The four Koch postulates are:
1. The diseased animal must contain the microorganism, which cannot be found in healthy animals.
2. The diseased animal's microorganism must be removed, isolated, and then grown in culture.
3. When given to an experimental animal that is healthy, the microorganism must make the animal ill.
4. The microorganism needs to be taken out of the sick experimental animal and proven to be the same microorganism that was first isolated from the sick animal.
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