+A **pathogen** is a biological agent that causes [Disease](/wiki/Disease) in its host. These microscopic entities, often [Virus](/wiki/Virus) or [Bacteria](/wiki/Bacteria), seek to multiply, sometimes disrupting normal bodily functions.
+## See also
+- [Immunity](/wiki/Immunity)
+- [Infection](/wiki/Infection)
+- [Host](/wiki/Host)
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