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Question
Why do some pathogens violate the single-cause assumption of Koch's Postulates?
Options
They lose virulence after the first passage in culture
They cannot be cultured in pure culture media
They require multiple host factors or co-infections to produce disease
They only cause disease in immunocompromised individuals
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Solution
Some pathogens require multiple host factors or simultaneous infections with other microorganisms to produce disease. This violates Koch's fundamental assumption that a single microorganism causes a single disease. For example, certain bacterial infections may require a preceding viral infection to establish disease, or multiple pathogens may act synergistically, making it impossible to satisfy postulate criteria that assume single causation.
