Question

Which of the following is NOT a part of Koch’s Postulates?

	a.	That diseased organism must be cured of symptoms and show no signs of the microorganism present
	b.	The microorganism must be re-isolated from that animal.
	c.	That cultured microorganism must cause disease when re-introduced into a healthy organism
	d.	The microorganism must be isolated from the diseased individual and grown in pure culture
	e.	The microorganism must be found in abundance in diseased individuals

Answer 1

The correct option is a - That diseased organism must be cured of symptoms and show no signs of the microorganism present

Koch's postulates are useful to identify the pathogen causing the disease. Koch's postulates help to determine the cause of the disease. To determine the cause of the disease, the microorganism must be present in the diseased organism.

To establish the relationship between the pathogen and the disease, the following are the Koch's postulates

1. The suspected microorganism must be found in all cases of the disease and should not be found in a healthy individual

2. The suspected microorganism must be isolated from the diseased individual and grown in pure culture

3. The causative agent should cause the disease if inserted in a healthy individual

4. The microorganism must be reisolated from the experimentally infected organism

Options b,c,d, and e are part of Koch's postulates. So these options are incorrect

Option a is not part of Koch's postulates. Hence, the correct option is a