What is a pathogen?

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Prepare for the Infection and Response Test. Master key concepts with flashcards and multiple-choice questions. Study with hints and explanations. Ace your exam!

Multiple Choice

What is a pathogen?

Explanation:
A pathogen is any disease-causing organism or infectious agent. This includes bacteria, viruses, fungi, parasites, and even infectious proteins (prions) that can damage a host and lead to illness. It’s not just any microbe, since many microbes are harmless or beneficial to us. It’s not a chemical causing disease, which would be a toxin or toxicant rather than a living or biologically active agent. While viruses are well-known pathogens, the category is broader, so the best description is a disease-causing organism or agent.

A pathogen is any disease-causing organism or infectious agent. This includes bacteria, viruses, fungi, parasites, and even infectious proteins (prions) that can damage a host and lead to illness. It’s not just any microbe, since many microbes are harmless or beneficial to us. It’s not a chemical causing disease, which would be a toxin or toxicant rather than a living or biologically active agent. While viruses are well-known pathogens, the category is broader, so the best description is a disease-causing organism or agent.

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