Which step of Koch's postulates is incorrect?
1.The pathogen is first found in an infected, unhealthy
person.
B. 2.The pathogen is isolated from an unhealthy person
and grown in a lab.
C. 3.The pathogen grown in a lab will be given to a healthy
organism that gets the same disease.
D. 4.The pathogen should be isolated again and should
have mutated when compared to the original.