Vaccination is a method of creating active immunity for the prevention of infectious diseases. For vaccination apply special preparations , vaccines, toxoids (see). Immunity after vaccination is relatively short and so after a certain period (for each infection particular) usually produce the re-introduction of the vaccine (booster) to restore the lost immunity or to create a more intense level of immunity to any infectious disease or their group.
As a result of revaccination vaccination efficiency increases significantly. Cm. also Immunization.