Question

Why do some pathogens violate the single-cause assumption of Koch's Postulates?

विकल्प

• 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

Answer 1

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.