Koch’s postulate

Robert Koch thus has established the relationship between a specific microorganism and a specific disease. The criteria for this can be generalized as: -

1. The microorganism must be present in every case of the disease;
2. The microorganism must be isolated from the diseased host and grown in pure culture;
3. The specific disease must be reproduced when a pure culture of the microorganism and inoculated into a healthy susceptible host and
4. The microorganism must be recoverable once again from the experimentally infected host.

These criteria has been generalized as Koch’s postulate to show respect to Koch’s work.