Question

How does a vaccine works?

Answer 1

Vaccines are like a training course for the immune system. They prepare the body to fight disease without exposing it to disease symptoms. When foreign invaders such as bacteria or viruses enter the body, immune cells called lymphocytes respond by producing antibodies, which are protein molecules.

Answer 2

the vaccine create dead bacteria of a specific dieseseas for which disese vaccine is to be made and than body treat it as living so form anti bacteria for it and these antibacteria last for specific time and when real live bacteria of that disese come they are killed by antibacteria