Question

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

Answer 1

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;

1. the microorganism must be found in every cases of the disease.
2. the microorganism must be isolated from the diseased host and grown in pure culture .
3. the cultured microorganism must cause the disease when introduced into a healthy laboratory animal .
4. the microorganism must be re-isolated from the new host and identified to be the same as the original causative agent .