Question

What is a vaccine? How does a vaccine work?

Answer 1

Vaccine: A vaccine is a preparation containing weakened germs or dead germs substance that provides immunity against particular disease.

The mechanism of functioning of vaccines is as follows:

• Vaccines are made of dead or weakened parts of a particular microorganism (antigen) that triggers an immune response within the body.
• When they enter the body, they cannot cause the disease, instead prompt the immune system to produce antibodies in response to the specific antigens.
• These antibodies fight against the antigens by antigen-antibody reaction.
• After killing the antigens, the antibodies are destroyed, but some immune cells called memory cells remain in the body.
• When the same pathogen attacks the person again, these memory cells produce antibodies immediately and kill the antigens before they cause the disease.