healthy individual is infected with a bacteria or virus, the body identifies the virus as an invader, and therefore produces the antibodies, which is the human body's immune system, to destroy the virus to assist the person to recover and become healthy. Meanwhile, vaccination is the process of stimulating the active immune system to fight disease in the body, and vaccine will boost the body active immunity to fight disease that may come into the body in the future. Through immunization, a child body system will enhance immunity in such a way that when he is in contact with a disease, his immune system will identify the disease as an invader and will produce the antibodies to fight the disease. In essence, active immunity is life-long lasting.

Many countries, especially developing countries, give children vaccination against Polio, Cholera, Yellow fever, Measles, Typhoid fever and other type of diseases. (Heymann, Aylward,...
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