A scientist testing a possible pathogen on a Petrie dish in a lab.
The definition of a pathogen is an agent, like a microorganism, that causes disease.
An example of a pathogen is salmonella.
any agent, esp. a microorganism, able to cause disease
Origin of pathogenpatho- + -gen
An agent that causes disease, especially a virus, bacterium, or fungus.
- phone tag
From patho- +"Ž -gen.