Immunization can prevent certain diseases because by using vaccines the body produces specific antibodies for diseases.
This refer to a biological process in which an individual becomes immune or increase its resistance against a disease as a result of vaccination.
Immunization works because the vaccine given has a weakened pathogen, once this pathogen enters the body an immune response is created. This means specific antibodies are produced to attack this pathogen. However, as this is only a weakened virus or bacteria, the disease does not develop and the body develops a "memory" to attack the real pathogen.
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