+A virus is a microscopic agent, a genetic whisper wrapped in protein, existing on the very edge of life. It invades [Host Cell](/wiki/host-cell)s, hijacking their machinery to replicate, often leading to [Disease](/wiki/disease) and profound biological change.
+## See also
+- [Bacteria](/wiki/bacteria)
+- [Immunity](/wiki/immunity)
+- [Vaccine](/wiki/vaccine)
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