Koch’s Postulates

Question 1

Postulate number 1

Answer 1

The suspected pathogen must be present in all cases of the disease and absent from healthy animals

Question 2

Postulate Number 2

Answer 2

The suspected pathogen must be grown in pure culture

Question 3

Postulate number 3

Answer 3

Cells from pure culture of the suspected pathogen must cause disease in healthy animals

Question 4

Postulate number 4

Answer 4

The suspected pathogen must be re isolated and shown to be the same as the original