Which of the following is a potential problem with satisfying Koch’s third postulate in practice?
A. Some disease-causing microorganisms may be found in healthy individuals.
B. Some disease-causing microorganisms only cause infection in humans, so no animal models are available.
C. Not all disease-causing microorganisms can be isolated and grown in pure culture in the laboratory.
D. Some disease-causing microorganisms will not cause disease in all individuals.
Answer: B. Some disease-causing microorganisms only cause infection in humans, so no animal models are available.
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