A vaccine is a preparation containing a pathogen (disease producing organism) either in attenuated or inactivated state. This preparation is introduced into an individual to induce adequate antibody production against the pathogen in question so that the individuals becomes protected against infection. The different vaccines differ in their composition, efficacy and the duration of effective protection to the vaccinated individuals. The various types of vaccines include whole-organism vaccines, purified macromolecules as vaccines, recombinant vector vaccines, DNA vaccines and multivalent subunit vaccines.
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