+A viral strain is a distinct genetic variant or subtype of a [virus](/wiki/virus). These variations arise through [mutation](/wiki/mutation) as viruses replicate, influencing characteristics like transmissibility, immune response, or virulence. Understanding strains is crucial for public health and vaccine development.
+## See also
+- [Pathogen](/wiki/pathogen)
+- [Epidemiology](/wiki/epidemiology)
+- [Vaccine](/wiki/vaccine)
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