Which statement about Koch's postulates is true according to the material?

Which statement about Koch's postulates is true according to the material?

• A. They are used to prove that microbes are found on dust particles.
• B. They state microbes can be used to clean up toxic spills.
• C. They indicate that a specific microbe is the cause of a specific disease.
• D. They require classifying microbes into a kingdom.

Answer: (C)

Koch's postulates provide a framework for linking a microbe to a disease. They are used to show that a specific microbe is the cause of a specific disease by demonstrating that the organism is present in diseased hosts, can be isolated in pure culture, causes disease when introduced into a healthy susceptible host, and can be re-isolated from the newly diseased host. Therefore, this statement—that a specific microbe is the cause of a specific disease—is the one that best reflects what Koch's postulates are designed to establish. The other topics described in the alternatives—association of microbes with dust particles, using microbes for bioremediation, or classifying microbes into a kingdom—are not about proving causation of disease. Historically, Koch's postulates were foundational for establishing microbial etiology, though real-world limitations (such as unculturable pathogens, diseases with multiple contributing factors, and ethical issues in experimentation) mean the postulates are applied with nuance today.

Koch's postulates provide a framework for linking a microbe to a disease. They are used to show that a specific microbe is the cause of a specific disease by demonstrating that the organism is present in diseased hosts, can be isolated in pure culture, causes disease when introduced into a healthy susceptible host, and can be re-isolated from the newly diseased host. Therefore, this statement—that a specific microbe is the cause of a specific disease—is the one that best reflects what Koch's postulates are designed to establish. The other topics described in the alternatives—association of microbes with dust particles, using microbes for bioremediation, or classifying microbes into a kingdom—are not about proving causation of disease. Historically, Koch's postulates were foundational for establishing microbial etiology, though real-world limitations (such as unculturable pathogens, diseases with multiple contributing factors, and ethical issues in experimentation) mean the postulates are applied with nuance today.