How do vaccines work?

Vaccines contain dead or weakened microbial strains of a particular disease. When a vaccine is introduced into a heathy body. It produces specific

cells against the pathogen.

These cells, are called antibodies and they becomes active when the pathogen attack our body. The body fights and kills them by producing

specific set of reactions.

These antibodies remain in the body for life long and protect against the microbe when microbe enters the body again.

Vaccines can be given either orally (in the forms of drops) or injected in the body.