1 The microorganism must be present in every case of the disease, but not in healthy hosts. 2 The microorganism must be grown in pure culture from diseased hosts. 3 The same disease must be produced when a pure culture of the microorganism is introduced into susceptible hosts. The same microorganism must be recovered from the experimentally infected hosts. FIGURE 16.3 Koch's Postulates These criteria provide a foundation for establishing that a given microbe causes a specific disease.

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Reproductive system infection

The biological process through which parents produce new children is called reproduction. A reproductive system is a group of internal and external organs that collaborate to allow males and females to reproduce. Many experts believe that the reproductive system is one of the most important systems in the body due to its crucial function in the survival of the species. Among the body's basic systems, the reproductive tract is the one that differs the most between sexes, and it is also the only one that does not operate until puberty.