Which of the following must be true in order to satisfy Koch's postulates?
A) causative agent must be observed in a small percentage of cases of disease
B) must be isolated from hosts that are not inoculated with the pure culture
C) when pure cultures inoculated in healthy hosts, they do not show disease
D) causative agent must be isolated from diseased host and grown in pure culture

Question

Quizplus · Accepted Answer

Koch's postulates state that in order to prove that a particular microorganism is the causative agent of a disease, the following conditions must be met: 
1) The microorganism must be isolated from a diseased host and grown in pure culture. 
2) The pure culture must be inoculated into a healthy, susceptible host and must cause the same disease as seen in the original host. 
3) The same microorganism must then be re-isolated from the second host, grown in pure culture, and shown to be identical to the original microorganism. 
Option D satisfies the first condition. The other options do not meet all three of Koch's postulates.

Which of the Following Must Be True in Order to Satisfy