Which does NOT represent one of Koch’s postulates?

A. Isolate germs from an infected animal.
B. Grow germs in a lab culture.
C. Inject germs into a healthy animal.
D. Watch to determine how long it takes for the healthy animal to become ill.

The last statement does not represent one of Koch's postulate, that is, the postulate did not include determination of how long it takes for the healthy animal to become ill. Koch's postulate established four criteria for determining the causative organism for a particular disease. The criteria are: the causative organism must be present in all cases of the disease, the causative organism must be isolated from the diseased host and grown in pure culture, the causative organism from the pure culture must cause the disease when inoculated into a health susceptible animal and the causative organism must be re-isolated from the new host and proof to be the same as the original causative organism inoculated into the health animal.

Answered by W0lf93 | 2024-06-11

The correct answer is option D, as observing the duration until a healthy animal becomes ill is not part of Koch's postulates. Koch’s postulates focus on isolation, culture, and re-isolation of microorganisms. Therefore, option D does not fit within the established criteria.
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Answered by W0lf93 | 2025-05-16