What do you mean by immunisation? State the principle on which it is based.
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The basic principle of immunization is that on administration of vaccine, the body starts developing antibodies against it such that person is protected form disease
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Immunisation or Vaccination is a method to prevent spread of infectious diseases in the community. It is carried out by injecting or inoculating vaccine - the killed or chemically weakened pathogens or their surface coatings into the body of a healthy person. On entering the body, pathogens stimulates formation of antibodies by the B-lymphocytes of our immune system. These antibodies remain in the body and prevent appearance of disease on any subsequent exposure to those microbes. This is called Immunity. It my be natural or induced.
In Natural Immunity an individual makes antibodies when contracts with some infectious disease and becomes immune to subsequent infection by the same pathogen.
Artificial Immunity is induced in an individual by injecting killed or weakened pathogens. These are called vaccines. A vaccine is weak enough to cause the disease but stimulates B-lymphocytes of the person to produce antibodies. These stay in the body and provide immunity.
In Natural Immunity an individual makes antibodies when contracts with some infectious disease and becomes immune to subsequent infection by the same pathogen.
Artificial Immunity is induced in an individual by injecting killed or weakened pathogens. These are called vaccines. A vaccine is weak enough to cause the disease but stimulates B-lymphocytes of the person to produce antibodies. These stay in the body and provide immunity.
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