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;

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this transfer is call conjunction