Vaccines can be prophylactic (e.g. to prevent or reduce the impact of a future infection by a pathogen), or therapeutic (e.g. cancer vaccines are being investigated). Vaccines exist in many different forms which may contain live, attenuated virus, or an inactivated micro-organism, or some unique molecular component of the organism that causes illnesses. Vaccines can generally be classified as Live Attenuated Vaccine, Inactivated Vaccine, Subunit Vaccine, Vector Vaccine, Conjugate Vaccine, DNA and RNA Vaccine and more.
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