A pathogen is:

A pathogen is:

• A. Precautions taken to prevent contamination of a surgical wound.
• B. A microorganism that produces disease.
• C. Disease that can be transmitted between animals and humans.
• D. Refers to the back.

Answer: (B)

A pathogen is any microorganism capable of causing disease in a host. This includes bacteria, viruses, fungi, parasites, and even prions in some contexts. Not every microbe causes disease—many are harmless or part of the normal flora—but when a pathogen invades and damages tissues or triggers harmful immune responses, disease results. This concept helps distinguish the idea of disease-causing agents from other ideas like measures to prevent wound contamination or the broader notion of diseases that can transmit between species, which are about transmission or prevention rather than what defines a pathogen.

A pathogen is any microorganism capable of causing disease in a host. This includes bacteria, viruses, fungi, parasites, and even prions in some contexts. Not every microbe causes disease—many are harmless or part of the normal flora—but when a pathogen invades and damages tissues or triggers harmful immune responses, disease results. This concept helps distinguish the idea of disease-causing agents from other ideas like measures to prevent wound contamination or the broader notion of diseases that can transmit between species, which are about transmission or prevention rather than what defines a pathogen.