Dr. marshall demonstrated that gastric ulcers are caused by a bacterium by using

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 .the cultured microorganism must cause the disease when introduced into a healthy laboratory animal .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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