Which of the following statement is incorrect regarding germ theory of diseases postulated by Robert Koch_____________?
Correct answer: C. The pure culture cannot produce the disease when inoculated into susceptible animal however the causative organism isolated from pure culture can do so.
- A. A specific organism can always be found in association with a given disease
- B. The organism can be isolated and grown in pure culture in the laboratories
- C. The pure culture cannot produce the disease when inoculated into susceptible animal however the causative organism isolated from pure culture can do so.
- D. It is possible to recover the organism in pure culture from the experimentally infected animals
Explanation
Koch's third postulate requires that the isolated organism, when introduced into a healthy susceptible host, reproduce the same disease. A pure culture contains only that isolated organism, so saying it cannot cause disease makes option c incorrect. Students may choose b by confusing isolation of an organism with proving that it causes disease.
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