Dr. marshall demonstrated that gastric ulcers are caused by a bacterium by using Koch’s postulates.
Koch’s postulates are four standards created to confirm a causative relationship between a microorganism and a disease. Koch’s postulates were formulated in 1884 by Robert Koch and Friedrich Loeffler. Koch’s postulates include;
the microorganism must be found in every cases of the disease.
the microorganism must be isolated from the diseased host and grown in pure culture
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the cultured microorganism must cause the disease when introduced into a healthy laboratory animal
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the microorganism must be re-isolated from the new host and identified to be the same as the original causative agent
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