vaccine
[ vak-seen or, especially British, vak-seen, -sin ]
noun
any preparation used as a preventive inoculation to confer immunity against a specific disease, usually employing an innocuous form of the disease agent, as killed or weakened bacteria or viruses, to stimulate antibody production.
the virus of cowpox, used in vaccination, obtained from pox vesicles of a cow or person.
The definition above agrees with my Follett Vest Pocket Webster Dictionary, 1965 edition. No mentions of gene therapy or RNA.
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