All of these statements are components of Koch’s postulates, except: A) Microorg
ID: 282433 • Letter: A
Question
All of these statements are components of Koch’s postulates, except:
A)
Microorganisms must be present in over half of the disease cases presently known.
A)
Microorganisms must be present in over half of the disease cases presently known.
B)
A suspected pathogen must be isolated from the diseased animal(s) and must be able to be grown in the laboratory.
C)
The specific disease must be reproduced when a pure culture of microorganisms is injected into a healthy susceptible animal.
D)
They involve the experimental infection of susceptible hosts. The pathogen must be recovered and re-isolated from the experimental animal.
A)
Microorganisms must be present in over half of the disease cases presently known.
A)
Microorganisms must be present in over half of the disease cases presently known.
B)
A suspected pathogen must be isolated from the diseased animal(s) and must be able to be grown in the laboratory.
C)
The specific disease must be reproduced when a pure culture of microorganisms is injected into a healthy susceptible animal.
D)
They involve the experimental infection of susceptible hosts. The pathogen must be recovered and re-isolated from the experimental animal.
Explanation / Answer
The correct option is option 1 – “Microorganisms must be present in over half of the disease cases presently known.”
Koch’s postulate does not explicitly state that half the diseases are caused by microbes. Rather, it states that microorganisms are causative agents of diseases and should be found in abundance in diseased individuals. These microorganisms should not be found in abundance in healthy individuals.
The other 3 postulates can be summarized as –
The microorganism must be isolated from a diseased individual. The isolated organisms must grow and propagate in a pure culture.
The cultured microorganism should introduce the symptoms of the disease that it is responsible for, when the microorganism is introduced in a healthy individual.
The microorganism must be reisolated from the inoculated, diseased experimental host. The characteristics of the reisolated microorganism must be identical to the original specific causative agent.