Question

state in brief the principal of immunisation ​

Answer 1

Definitions

Immunisation describes the process whereby people are protected against illness caused by infection with micro-organisms (formally called pathogens).

The term vaccine refers to the material used for immunisation, while vaccination refers to the act of giving a vaccine to a person.

Immunity describes the state of protection that occurs when a person has been vaccinated or has had an infection and recovered.

Vaccination, like infection, confers immunity by interaction with the immune system.

The term micro-organism refers to infectious agents that can only been seen under the microscope and here covers bacteria, viruses, fungi and protozoa.

Antigens are the components/fragments from pathogens or their toxins.

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Answer 2

Answer:

Immunisation protects against infectious disease

Vaccines work by stimulating the body's defence mechanism against infection. These defence mechanisms are collectively reffered to as the immune system.