The method through which dead pathogens or non-toxic components of a pathogen are introduced into the body to provoke an immune response that prevents a certain disease is called vaccination.
Vaccination is a form of passive immunization. It contains inactivated pathogens and dead particles which when introduced into the body cause production of antibodies that shield the immune system against these particles. Immunization and vaccination are used interchangeably to denote this process. It is based on the principle of 'memory'.
The generation of B cells and T cells recognizes the pathogen when the body encounters it again in the future. Fever, nausea, and weakness may occur during vaccination. Every child must be vaccinated timely within 1 year to protect them from various deadly diseases such as typhoid, DPT, pneumonia, etc.
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