+A [Viral Disease](/wiki/viral_disease) arises when a [Virus](/wiki/virus) invades living cells, hijacking their machinery to replicate. This often leads to [Infection](/wiki/infection) and illness, ranging from mild to severe, as the body's defenses battle the replicating agents.
+## See also
+- [Pathogen](/wiki/pathogen)
+- [Immunity](/wiki/immunity)
+- [Vaccine](/wiki/vaccine)
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