a preparation that contains an infectious agent or its
components which is administered to stimulate an immune response that
will protect a person from illness due to that agent. A therapeutic (treatment)
vaccine is given after infection and is intended to reduce or arrest disease
progression. A preventive (prophylactic) vaccine is intended to prevent
initial infection. Agents used in vaccines may be whole-killed (inactive),
live-attenuated (weakened) or artificially manufactured.
VaccineJAMA A substance that contains antigenic components from an infectious organism. By stimulating an immune response (but not disease), it protects against subsequent infection by that organism. See also Antigen; Vaccination.
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