Question

What ethical constraint limits the application of Koch's Postulates?

Options

• Researchers cannot study pathogens in the laboratory

• Deliberate human infection trials are prevented by ethical constraints

• Microorganisms cannot be cultivated in artificial media

• Animal testing is universally prohibited in medical research

Answer 1

Ethical constraints prevent deliberate infection of human subjects to fulfill Koch's Postulates, particularly the third postulate requiring reproduction of disease in a susceptible host. While animal models can sometimes be used, for human-only diseases, ethical principles prohibit intentional infection of people, making complete verification of causation impossible through traditional Koch's Postulate methodology.