Question

Which of the following statements is NOT true for Koch's postulates? (or Koch's first postulate)

• A. The microorganism must be present in every case of the disease.
• B. The specific disease must be reproduced when a pure culture of the microorganism is inoculated into healthy susceptible host.
• C. The causative agent of the disease must be present in every diseased host.
• D. The microorganism must be isolated from diseased host and grown in Mixed culture.

Hint:

The key to Koch's second postulate is the development of pure culture techniques.
Robert Koch and his assistant Julius Richard Petri (who invented the Petri dish) developed solid media methods using agar to isolate single bacterial colonies.

Answer 1

The Correct Option is D